CN101168961A - A method and application of using geotechnical bag to treat foundation in expansive soil area - Google Patents
A method and application of using geotechnical bag to treat foundation in expansive soil area Download PDFInfo
- Publication number
- CN101168961A CN101168961A CNA2007101906418A CN200710190641A CN101168961A CN 101168961 A CN101168961 A CN 101168961A CN A2007101906418 A CNA2007101906418 A CN A2007101906418A CN 200710190641 A CN200710190641 A CN 200710190641A CN 101168961 A CN101168961 A CN 101168961A
- Authority
- CN
- China
- Prior art keywords
- expansive soil
- bag
- soil
- expansive
- geotechnical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002689 soil Substances 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000009412 basement excavation Methods 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 26
- 238000007654 immersion Methods 0.000 abstract description 5
- 239000004746 geotextile Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
一种用土工袋处理膨胀土地区地基的方法。该方法将工程建设地开挖出来的膨胀土直接装入材质与尺寸大小经严格控制的土工袋内，然后按一定的排列方式将土工袋堆积在工程建设地上，并采用碾压设备逐层把装有膨胀土的土工袋压实，形成建筑物的地基。该方法的作用原理为：在上载压力和浸水膨胀作用过程中，土工袋的周长伸长，从而在土工袋中产生一个张力，该张力一方面约束着膨胀土的膨胀变形，另一方面相当于在膨胀土中产生了一个附加凝聚力，提高了袋装膨胀土的整体强度。用土工袋处理膨胀土地基绿色环保，施工简便，效益显著。
A method of treating foundations in expansive soil areas with geotextile bags. In this method, the expansive soil excavated from the engineering construction site is directly packed into the geotechnical bag whose material and size are strictly controlled, and then the geotechnical bag is piled up on the engineering construction site according to a certain arrangement, and the rolling equipment is used to separate the geotechnical bags layer by layer. Geobags filled with expansive soil are compacted to form the foundation of the building. The working principle of this method is: in the process of uploading pressure and water immersion expansion, the perimeter of the geotechnical bag is elongated, thereby generating a tension in the geotechnical bag, which on the one hand restrains the expansion deformation of expansive soil, and on the other hand is equivalent to An additional cohesion is created in the expansive soil, increasing the overall strength of the bagged expansive soil. The use of geotechnical bags to treat expansive soil foundations is green and environmentally friendly, with simple construction and significant benefits.
Description
一、技术领域1. Technical field
本发明涉及一种膨胀土地基处理方法，具体地说是涉及一种利用土工袋处理膨胀土地基的方法，该方法可以抑制膨胀土浸水膨胀变形、防止膨胀土地基开裂、增强膨胀土强度。The invention relates to a method for treating expansive soil foundations, in particular to a method for treating expansive soil foundations with a geotechnical bag, which can inhibit swelling and deformation of expansive soils soaked in water, prevent cracking of expansive soil foundations, and enhance the strength of expansive soils.
二、背景技术2. Background technology
膨胀土(岩)中富含以蒙脱石为主的亲水矿物，具有吸水时体积膨胀、失水时土体收缩变形的特点。吸水时产生较高的膨胀力。反复胀缩的结果使得土(岩)体结构发生破坏，力学强度随之降低。因此，膨胀土地区工程建设中常遇到以下几个主要问题：Expansive soil (rock) is rich in hydrophilic minerals mainly montmorillonite, which has the characteristics of volume expansion when water is absorbed, and soil shrinkage and deformation when water is lost. Produces high expansion force when absorbing water. As a result of repeated expansion and contraction, the structure of soil (rock) is destroyed, and the mechanical strength is reduced accordingly. Therefore, the following main problems are often encountered in engineering construction in expansive soil areas:
a.建筑物地基的变形问题a. Deformation problem of building foundation
膨胀土体吸水膨胀、失水收缩的结果，使得地基隆起与开裂，产生不均匀变形；As a result of water absorption and shrinkage of expansive soil, the foundation will bulge and crack, resulting in uneven deformation;
b.边坡稳定性问题b. Slope stability problem
膨胀土边坡在长期胀缩作用下，土(岩)体结构发生破坏，使得土体强度降低，同时出现大量的裂隙与裂缝。因此，膨胀土边坡表层吸水含水量增大时，极易产生沿着裂隙、裂缝的滑动破坏；Under the action of long-term expansion and contraction of expansive soil slope, the structure of soil (rock) body is destroyed, which reduces the strength of soil body, and at the same time, a large number of cracks and cracks appear. Therefore, when the water absorption and water content of the surface of the expansive soil slope increase, sliding failure along the fissures and cracks is very easy to occur;
c.膨胀岩土的洞室稳定问题c. Cavern stability in expansive rock and soil
由于膨胀土的强度随含水量的增加而降低，因此，在膨胀土地区开挖洞室时，若遇雨水则有塌方的危险。Since the strength of expansive soil decreases with the increase of water content, when excavating caverns in expansive soil areas, there is a risk of collapse in case of rain.
因此，在膨胀土地区建设工程项目需进行地基处理。目前，常规的膨胀土地基处理方法有：换土法、化学改良法和桩基础等。换土法即是把工程建设地的膨胀土全部或部分挖掉，换以非膨胀性土，以消除或减少地基的胀缩变形。通常膨胀土地区近距离往往缺乏非膨胀土料源，需要从较远地区取得，同时开挖出来的膨胀土需要大面积的弃料堆场，因此，存在成本高、占用土地多、对当地环境和水土流失影响大等问题；化学改良法即用一定量的石灰、水泥或矿渣等物掺入到膨胀土中，以改变膨胀土的特性，达到消减膨胀土的胀缩变形的目的。由于该方法把化学物质掺入到土壤中，改变了土壤的性质，不利于环保；膨胀土桩基础的工作状态较复杂，浸水膨胀时在桩侧和土之间产生胀切力，失水收缩后又会在桩身周围产生负摩擦，而且，浸水后，由于土体强度降低，土体变软，桩的承载力会大大下降。Therefore, foundation treatment is required for construction projects in expansive soil areas. At present, the conventional expansive soil foundation treatment methods include: soil replacement method, chemical improvement method and pile foundation, etc. The soil replacement method is to dig out all or part of the expansive soil in the construction site and replace it with non-expansive soil to eliminate or reduce the expansion and contraction deformation of the foundation. Generally, expansive soil areas often lack non-expansive soil sources at close distances and need to be obtained from distant areas. At the same time, the excavated expansive soil requires a large area of waste stockpiles. Therefore, there are high costs, large land occupation, and adverse effects on the local environment. The chemical improvement method is to mix a certain amount of lime, cement or slag into the expansive soil to change the characteristics of the expansive soil and achieve the purpose of reducing the expansion and contraction deformation of the expansive soil. Because this method mixes chemical substances into the soil, which changes the properties of the soil, it is not conducive to environmental protection; the working state of the pile foundation of expansive soil is more complicated, and when it is soaked in water, a shear force will be generated between the pile side and the soil, and it will shrink when it loses water. Finally, negative friction will be generated around the pile body, and after soaking in water, due to the decrease in soil strength and softening of the soil, the bearing capacity of the pile will be greatly reduced.
三、发明内容3. Contents of the invention
本发明的目的在于克服了现有技术中的不足，提供一种用土工袋处理膨胀土地区地基的方法，其特征在于处理方法步骤如下：The object of the invention is to overcome the deficiencies in the prior art, provide a kind of method with geotechnical bag processing expansive soil area foundation, it is characterized in that processing method step is as follows:
(a)首先在工程建设地根据设计要求的深度把膨胀土(1)开挖出来，并把开挖出来的膨胀土(1)装入一系列的土工袋(2)内，并帮扎好袋口后，形成的袋装膨胀土(3)待用；(a) First excavate the expansive soil (1) at the construction site according to the depth required by the design, and put the excavated expansive soil (1) into a series of geotechnical bags (2) and tie them up After the bag mouth, the bagged expansive soil (3) that forms is stand-by;
(b)在开挖深度处理层底面裸露的土层面上，用碾压机械压实此土层，并在此层面上铺上一层防渗水的油毛毡或土工膜；(b) On the exposed soil layer at the bottom of the excavation depth treatment layer, compact the soil layer with a rolling machine, and lay a layer of waterproof felt or geomembrane on this layer;
(c)把步骤(a)的袋装膨胀土(3)吊至工程地基处，按纵横交错的排列方式放置袋装膨胀土(3)，然后用碾压机械压成扁平状，直至压实到设计要求的密实度为止，袋装膨胀土(3)之间的空隙(4)用开挖的膨胀土(1)填充；(c) Hang the bagged expansive soil (3) of step (a) to the engineering foundation, place the bagged expansive soil (3) in a criss-cross arrangement, and then press it into a flat shape with a rolling machine until compacted Up to the compactness required by the design, the gap (4) between the bagged expansive soil (3) is filled with the excavated expansive soil (1);
(d)按步骤(c)的方式逐层施工，直至到顶层，形成建筑物的地基，在地基的斜坡表面上设有表面保护(5)。(d) Construct layer by layer according to the mode of step (c), until the top floor is reached to form the foundation of the building, and a surface protection (5) is provided on the slope surface of the foundation.
上述步骤(a)所述的土工袋是由掺加了1％防老化剂的聚丙烯材料制成，平面尺寸为40-100cm×40-100cm。The geotechnical bag described in the above step (a) is made of polypropylene material mixed with 1% anti-aging agent, and the plane size is 40-100cm×40-100cm.
上的用土工袋处理膨胀土地区地基的方法在工民建地基中的应用。The application of the above-mentioned method of using geotechnical bag to treat the foundation of expansive soil area in the foundation of industrial and civil construction.
上述用土工袋处理膨胀土地区地基的方法在公路与铁路地基中的应用。Application of the above-mentioned method of using geotechnical bags to treat foundations in expansive soil areas in road and railway foundations.
图1为用土工袋处理膨胀土机理分析概念图。袋装膨胀土经压实后，在上载压力作用及膨胀土发生浸水膨胀变形时，袋子周长伸长，从而在袋子中产生一个张力T。袋子张力T对土袋内的膨胀土起到一个约束作用，使得土颗粒间的接触力N增加。由于土体强度本质上源于土颗粒间的摩擦强度，土颗粒间接触力N增加意味着土颗粒间的摩擦强度增大(符合摩擦定律F＝μN，μ：土颗粒间摩擦系数)，因此，袋装膨胀土的整体强度提高。同时袋子张力T限制了膨胀土的浸水膨胀变形。Figure 1 is a conceptual diagram of the mechanism analysis of expansive soil treated with geotechnical bags. After the bagged expansive soil is compacted, the circumference of the bag will elongate under the action of the upper pressure and the swelling and deformation of the expansive soil, thus generating a tension T in the bag. The bag tension T acts as a constraint on the expansive soil in the soil bag, which increases the contact force N between soil particles. Since the strength of the soil is essentially derived from the friction strength between soil particles, the increase of the contact force N between soil particles means that the friction strength between soil particles increases (conforming to the friction law F=μN, μ: friction coefficient between soil particles), so , the overall strength of the bagged expansive soil is improved. At the same time, the tension T of the bag limits the swelling deformation of the expansive soil when soaked in water.
本发明的有益效果是：(1)强度上，土工袋在压实及浸水时，土工袋的周长会伸长，伸长的结果是袋子产生一个张力，张力的作用使得袋装膨胀土的强度得到增加；(2)变形上，由于土工袋的张力约束作用，袋装膨胀土的浸水变形比不处理的膨胀土的浸水变形相比较大大减小，不会引起工程问题；(3)渗透性上，袋装膨胀土堆积体的渗透系数较大，达到10-4～10-3cm/s的量级，进入土工袋组合体的雨水或其他渗水会很快排走，不会有大量水进入土工袋内的膨胀土中；(4)环保上，用土工袋处理膨胀土地区的地基，不会对土壤产生任何不良影响，同时，膨胀土就地使用，不会有弃土的堆土场，是一种绿色环保的地基处理方法。The beneficial effects of the present invention are: (1) in terms of strength, when the geotechnical bag is compacted and soaked in water, the perimeter of the geotechnical bag can be elongated, and the result of the elongation is that the bag produces a tension force, and the effect of the tension force makes the strength of the bagged expansive soil obtain (2) In terms of deformation, due to the tension constraint effect of the geotechnical bag, the water-immersed deformation of the bagged expansive soil is much smaller than that of the untreated expansive soil, which will not cause engineering problems; (3) In terms of permeability , the permeability coefficient of the bagged expansive soil accumulation is relatively large, reaching the order of 10 -4 ~ 10 -3 cm/s, the rainwater or other seepage water entering the geotechnical bag assembly will be drained away quickly, and there will be no large amount of water entering In the expansive soil in the geotechnical bag; (4) In terms of environmental protection, using a geotechnical bag to treat the foundation in the expansive soil area will not have any adverse effects on the soil. , is a green and environmentally friendly foundation treatment method.
四、附图说明4. Description of drawings
图1为土工袋处理膨胀土机理分析概念图；Figure 1 is a conceptual diagram of the mechanism analysis of expansive soil treated by geotechnical bags;
图2为土工袋处理膨胀土路基示意图；Fig. 2 is the schematic diagram of expansive soil embankment treated by geotechnical bag;
图3为不同垂直压力下袋装强膨胀土袋子中发挥的最大张力；Fig. 3 is the maximum tension exerted in the bagged strong expansive soil bag under different vertical pressures;
图4为取强膨胀土的内摩擦角φ＝12°，根据最大张力计算得到的附加凝聚力图；Fig. 4 is to take the internal friction angle φ=12 ° of strong expansive soil, the additional cohesion figure calculated according to the maximum tension;
图5为初始含水量20％袋装膨胀土与膨胀土浸水变形比较图；Fig. 5 is a comparison diagram of the bagged expansive soil with an initial water content of 20% and the water-immersed deformation of the expansive soil;
图6为初始含水量24％袋装膨胀土与膨胀土浸水变形比较图。Fig. 6 is a comparison diagram of the bagged expansive soil with an initial water content of 24% and the water-immersed deformation of the expansive soil.
附图标记：1.膨胀土，2.土工袋，3.袋装膨胀土，4.填充土工袋之间的空隙的膨胀土，5.表面保护(混凝土衬砌或草坪护坡)。Reference signs: 1. expansive soil, 2. geotechnical bag, 3. bagged expansive soil, 4. expansive soil filling the space between geotechnical bags, 5. surface protection (concrete lining or lawn slope protection).
五、具体实施方式5. Specific implementation
实施例1 一种用土工袋处理膨胀土地区地基的方法，其处理方法步骤如下：Embodiment 1 A kind of method with geotechnical bag processing expansive soil area foundation, its processing method step is as follows:
(a)在膨胀土地区划定的工程建设地，根据设计所需的土层处理深度为4m，开挖出这一深度的膨胀土(1)装入100cm×100cm的土工袋(2)内，扎好袋口后，形成的袋装膨胀土(3)待用；(a) In the project construction site delineated in the expansive soil area, according to the design required soil layer treatment depth of 4m, excavate the expansive soil of this depth (1) and put it into a geotechnical bag (2) of 100cm×100cm After tying the mouth of the bag, the bagged expansive soil (3) formed is ready for use;
(b)在处理层4m的裸露的土层面上，用碾压机械压实此土层；(b) On the exposed soil layer of the treatment layer 4m, compact the soil layer with a rolling machine;
(c)把袋装膨胀土(3)吊至工程地基处，按纵横交错的排列方式放置袋装膨胀土(3)，然后用碾压机械压成扁平状，直至压实到设计要求的密实度1.5-2.0g/cm3为止，袋装膨胀土(3)之间的空隙(4)用开挖的膨胀土(1)填充；(c) Lift the bagged expansive soil (3) to the project foundation, place the bagged expansive soil (3) in a criss-cross arrangement, and then press it into a flat shape with a rolling machine until it is compacted to the compactness required by the design until the density is 1.5-2.0g/ cm3 , the gap (4) between the bagged expansive soil (3) is filled with the excavated expansive soil (1);
(d)按上述方式逐层施工，直至到顶层，形成建筑物的地基，在地基的斜坡表面上设置用混凝土衬砌的表面保护(5)。(d) Construct layer by layer according to the above method until reaching the top floor to form the foundation of the building, and set the surface protection (5) with concrete lining on the slope surface of the foundation.
实施例2 结合附图和现有的室内相关试验成果，对本发明作进一步说明。Embodiment 2 The present invention will be further described in conjunction with accompanying drawings and existing indoor relevant test results.
本发明提供一种用土工袋处理膨胀土地基的方法，即把工程建设地开挖出来的膨胀土直接装入土工袋内，按一定的排列方式堆积在工程建设的地基上，采用碾压设备逐层把装有膨胀土的土工袋压实，形成建筑物的地基。The invention provides a method for treating expansive soil foundation with a geotechnical bag, that is, the expansive soil excavated from the engineering construction site is directly packed into the geotechnical bag, piled up on the foundation of the engineering construction according to a certain arrangement, and the rolling equipment is used. The geobags filled with expansive soil are compacted layer by layer to form the foundation of the building.
所述的土工袋材料是一种掺加了1％的防老化剂(UV)的聚丙烯(pp)编织袋，其平面尺寸室内试验使用的为40cm×40cm，实际工程中可放大至1m×1m。The geotechnical bag material is a kind of polypropylene (pp) woven bag mixed with 1% anti-aging agent (UV). 1m.
所述的袋装膨胀土是利用就地开挖的膨胀土尽可能多的装入土工袋内，装满之后，把袋口封紧，再利用碾压设备压实土工袋至需要的密实度，土工袋被压成扁平状。The bagged expansive soil is to use the expansive soil excavated on site to put as much as possible into the geotechnical bag, after filling, seal the bag tightly, and then use rolling equipment to compact the geotechnical bag to the required density , The geotextile bag is pressed into a flat shape.
所述的袋装膨胀土，如图1，在上载压力及浸水膨胀作用下，土工袋的周长会伸长，伸长的结果是在袋子中产生一个张力T，袋子张力T对土袋内的膨胀土起到一个约束作用，使得袋子内的土颗粒间的接触力N增大， N增加意味着土颗粒间的摩擦强度增大(符合摩擦定律F＝μN，μ：土颗粒间摩擦系数)。袋装膨胀土的整体强度提高。具体来说，就是由于袋子张力的约束作用，产生了一个附加凝聚力，使得袋装膨胀土所体现出来的凝聚力比实际的膨胀土的凝聚力要大。根据室内试验的结果，装有膨胀土的袋子周长的伸长变形包括二部分：一部分是膨胀土装入袋子后压实过程中产生的；另一部分是浸水膨胀变形产生的。根据土工袋材料张力与伸长应变的关系，可以计算得到的袋子中产生的张力T的大小。图3为计入压实过程中产生的袋子周长伸长后，初始含水量w＝20％、24％的袋装强膨胀土浸水变形试验得到的土袋在不同垂直压力下袋子中发挥的最大张力。计算张力T引起的土袋附加凝聚力cT，如图4所示，土袋张力引起的附加凝聚力cT值达200～300kPa，而相同工况下膨胀土固有粘聚力在含水量w＝20％、24％时为200kPa、120kPa，故比膨胀土固有的凝聚力要大。因此，膨胀土装入土工袋后，其强度将得到大大提高。并且，由于外加垂直压力小的情况下土袋浸水变形量大，张力引起的附加凝聚力cT值大，土袋处理效果明显。这对工程安全来说是非常有利的，因为膨胀土破坏通常在表层发生，而表层的土体应力不大。The bagged expansive soil, as shown in Figure 1, under the action of upload pressure and water swell, the perimeter of the geotechnical bag will elongate, and the result of elongation is to produce a tension T in the bag, and the bag tension T has a great influence on the expansion of the soil bag. The soil acts as a constraint, which increases the contact force N between the soil particles in the bag, and the increase of N means that the friction strength between the soil particles increases (conforming to the friction law F=μN, μ: friction coefficient between soil particles). The overall strength of the bagged expansive soil is improved. Specifically, due to the constraint of the bag tension, an additional cohesion is generated, so that the cohesion of the bagged expansive soil is greater than that of the actual expansive soil. According to the results of the laboratory test, the elongation deformation of the bag perimeter with expansive soil includes two parts: one part is produced during the compaction process after the expansive soil is packed into the bag; According to the relationship between the tension of the geotechnical bag material and the elongation strain, the magnitude of the tension T generated in the bag can be calculated. Figure 3 shows the maximum tension exerted in the bag under different vertical pressures obtained from the water immersion deformation test of the bagged strong expansive soil with the initial water content w=20% and 24% after taking into account the elongation of the bag perimeter generated during the compaction process . Calculate the additional cohesion c T of the soil bag caused by the tension T, as shown in Figure 4, the value of the additional cohesion c T caused by the tension of the soil bag reaches 200-300kPa, and under the same working conditions, the inherent cohesion of expansive soil is at a water content of w=20 % and 24%, it is 200kPa and 120kPa, so it is stronger than the inherent cohesion of expansive soil. Therefore, after the expansive soil is loaded into the geotechnical bag, its strength will be greatly improved. Moreover, because the soil bag soaking deformation is large when the external vertical pressure is small, the additional cohesion c T value caused by the tension is large, and the soil bag treatment effect is obvious. This is very beneficial to engineering safety, because expansive soil damage usually occurs on the surface, and the soil stress on the surface is not large.
所述的袋装膨胀土，从室内浸水变形试验来看，袋装膨胀土单体变形量随上载压力的增加而减小，当上载垂直压力达到一定的值后趋于稳定。这是因为当上载垂直压力比较小，不足以平衡试样膨胀力时，膨胀力对浸水膨胀变形的作用明显，而当上载垂直压力逐渐增大，膨胀力的作用所占的比例逐渐减小，直至完全消失。从袋装膨胀土和不装袋的膨胀土的浸水变形对比试验，如图5、图6所示，袋装膨胀土的竖向膨胀率均比膨胀土的膨胀率要小。According to the indoor water immersion deformation test of the bagged expansive soil, the single deformation of the bagged expansive soil decreases with the increase of the upload pressure, and tends to be stable when the upload vertical pressure reaches a certain value. This is because when the upper vertical pressure is relatively small and not enough to balance the expansion force of the sample, the expansion force has a significant effect on the water-immersion expansion deformation, and when the upper vertical pressure gradually increases, the proportion of the expansion force gradually decreases. until it disappears completely. From the water immersion deformation comparison test of bagged expansive soil and expansive soil without bagging, as shown in Figure 5 and Figure 6, the vertical expansion rate of bagged expansive soil is smaller than that of expansive soil.
所述的袋装膨胀土组合体的渗透系数k，不论是垂直向还是水平向，都比较大，达到10-4～10-3cm/s的量级，因此袋装膨胀土组合体相当于一种半透水材料。如果地基设计有良好的排水系统，雨水或其它渗水很快就会从组合体间填土中排掉，不大可能会渗入到土工袋内部的膨胀土，不会引起土工袋内膨胀土中的水分很大的变化。The permeability coefficient k of the bagged expansive soil combination is relatively large in both vertical and horizontal directions, reaching the order of 10 -4 ~ 10 -3 cm/s, so the bagged expansive soil combination is equivalent to A semi-permeable material. If the foundation is designed with a good drainage system, rainwater or other seepage water will quickly drain from the fill between the composites, and it is unlikely to seep into the expansive soil inside the geobag and will not cause swelling in the expansive soil inside the geobag. Moisture changes a lot.
所述的袋装膨胀土，工程应用时，层与层之间需纵横交错排列，从室内的摩擦试验看，层与层之间的摩擦系数大于1.0，一般在1.05～1.2之间。因此，堆积的土工袋层与层之间稳定性是可以保证的。When the bagged expansive soil is used in engineering, the layers need to be arranged in a criss-cross pattern. According to the indoor friction test, the friction coefficient between the layers is greater than 1.0, generally between 1.05 and 1.2. Therefore, the stability between layers of stacked geobags can be guaranteed.
所述的土工袋处理膨胀土地区的地基方法，适用于建筑、交通、水利等领域，具体来说，可用于工民建地基、公路与铁路地基、渠道边坡、堤坝、挡墙等。The method for treating foundations in expansive soil areas with geotechnical bags is applicable to fields such as construction, transportation, and water conservancy. Specifically, it can be used for industrial and civil construction foundations, road and railway foundations, canal slopes, dams, retaining walls, and the like.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101906418A CN101168961A (en) | 2007-11-27 | 2007-11-27 | A method and application of using geotechnical bag to treat foundation in expansive soil area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101906418A CN101168961A (en) | 2007-11-27 | 2007-11-27 | A method and application of using geotechnical bag to treat foundation in expansive soil area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101168961A true CN101168961A (en) | 2008-04-30 |
Family
ID=39389720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101906418A Pending CN101168961A (en) | 2007-11-27 | 2007-11-27 | A method and application of using geotechnical bag to treat foundation in expansive soil area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101168961A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298777B (en) * | 2008-06-20 | 2010-08-18 | 同济大学 | Method and device for preventing land slide of swelled ground |
| CN102297879A (en) * | 2010-06-28 | 2011-12-28 | 长江水利委员会长江科学院 | Method for rapidly discriminating expansive soil (rock) on site by use of soil electrical conductivity |
| CN102465481A (en) * | 2010-11-09 | 2012-05-23 | 刘斯宏 | Soilbag roadbed and method |
| CN102910318A (en) * | 2012-10-31 | 2013-02-06 | 河海大学 | Bagging equipment for soil bags and soil packing method and application |
| CN103711104A (en) * | 2014-01-15 | 2014-04-09 | 水利部交通运输部国家能源局南京水利科学研究院 | Homogeneous earth dam revetment and anti-frost method thereof |
| CN104542069A (en) * | 2015-01-30 | 2015-04-29 | 河海大学 | Water retention type geotextile bag and green land application method thereof |
| CN105569058A (en) * | 2016-02-16 | 2016-05-11 | 中国建筑第六工程局有限公司 | Expansive soil cutting structure and construction method thereof |
| CN109086513A (en) * | 2018-07-24 | 2018-12-25 | 中铁二院工程集团有限责任公司 | A kind of measuring method of expensive soil cutting bedding bottom heave amount |
| CN109900406A (en) * | 2019-03-15 | 2019-06-18 | 广西岩土新技术有限公司 | Expand soil layer negative friction conversion coefficient measuring device, design method and measurement method |
| CN113065185A (en) * | 2021-03-31 | 2021-07-02 | 上海交通大学 | Woven bag structure unit for protecting expansive soil slope and design method |
| CN113373949A (en) * | 2021-05-20 | 2021-09-10 | 上海工程技术大学 | Protective structure for expansive soil slope and construction method |
| CN115326581A (en) * | 2022-07-12 | 2022-11-11 | 中铁二院工程集团有限责任公司 | Loading mechanism for shield tunnel and stratum composite simulation test and test method |
-
2007
- 2007-11-27 CN CNA2007101906418A patent/CN101168961A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298777B (en) * | 2008-06-20 | 2010-08-18 | 同济大学 | Method and device for preventing land slide of swelled ground |
| CN102297879A (en) * | 2010-06-28 | 2011-12-28 | 长江水利委员会长江科学院 | Method for rapidly discriminating expansive soil (rock) on site by use of soil electrical conductivity |
| CN102297879B (en) * | 2010-06-28 | 2013-06-05 | 长江水利委员会长江科学院 | Method for rapidly discriminating expansive soil (rock) on site by use of soil electrical conductivity |
| CN102465481A (en) * | 2010-11-09 | 2012-05-23 | 刘斯宏 | Soilbag roadbed and method |
| CN102910318A (en) * | 2012-10-31 | 2013-02-06 | 河海大学 | Bagging equipment for soil bags and soil packing method and application |
| CN102910318B (en) * | 2012-10-31 | 2014-03-26 | 河海大学 | Bagging equipment for soil bags and soil packing method and application |
| CN103711104A (en) * | 2014-01-15 | 2014-04-09 | 水利部交通运输部国家能源局南京水利科学研究院 | Homogeneous earth dam revetment and anti-frost method thereof |
| CN103711104B (en) * | 2014-01-15 | 2015-04-01 | 水利部交通运输部国家能源局南京水利科学研究院 | Homogeneous earth dam revetment and anti-frost method thereof |
| CN104542069A (en) * | 2015-01-30 | 2015-04-29 | 河海大学 | Water retention type geotextile bag and green land application method thereof |
| CN105569058A (en) * | 2016-02-16 | 2016-05-11 | 中国建筑第六工程局有限公司 | Expansive soil cutting structure and construction method thereof |
| CN109086513A (en) * | 2018-07-24 | 2018-12-25 | 中铁二院工程集团有限责任公司 | A kind of measuring method of expensive soil cutting bedding bottom heave amount |
| CN109086513B (en) * | 2018-07-24 | 2022-05-10 | 中铁二院工程集团有限责任公司 | Method for measuring and calculating bottom swelling amount of expansive soil road cutting bed |
| CN109900406A (en) * | 2019-03-15 | 2019-06-18 | 广西岩土新技术有限公司 | Expand soil layer negative friction conversion coefficient measuring device, design method and measurement method |
| CN109900406B (en) * | 2019-03-15 | 2024-05-17 | 广西岩土新技术有限公司 | Device for measuring negative friction conversion coefficient of expansive soil layer, design method and measurement method |
| CN113065185A (en) * | 2021-03-31 | 2021-07-02 | 上海交通大学 | Woven bag structure unit for protecting expansive soil slope and design method |
| CN113373949A (en) * | 2021-05-20 | 2021-09-10 | 上海工程技术大学 | Protective structure for expansive soil slope and construction method |
| CN113373949B (en) * | 2021-05-20 | 2022-07-22 | 上海工程技术大学 | Protective structure for expansive soil slope and construction method |
| CN115326581A (en) * | 2022-07-12 | 2022-11-11 | 中铁二院工程集团有限责任公司 | Loading mechanism for shield tunnel and stratum composite simulation test and test method |
| CN115326581B (en) * | 2022-07-12 | 2024-12-24 | 中铁二院工程集团有限责任公司 | Loading mechanism and test method for simulation test of shield tunnel and stratum complex |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101168961A (en) | A method and application of using geotechnical bag to treat foundation in expansive soil area | |
| Han | Recent research and development of ground column technologies | |
| CN103233454B (en) | Processing method of soaking, vacuum preloading and slurry injecting for sand piles of collapsible loess foundation | |
| CN101831895B (en) | Method for determining soft soil foundation landfill site foundation treatment mode based on foundation bearing capacity | |
| CN104818707B (en) | Application cotton stalk consolidation and solidification dredging silt, the method for new barged-in fill | |
| CN2911010Y (en) | Fast reinforcing apparatus for blowing-filling sludge ground | |
| CN105297570B (en) | Special soil subgrade structure and construction method thereof | |
| CN105220674A (en) | Deep soft foundation reinforcing and processing method | |
| CN101624830A (en) | Method for treating expansive soil channel side slopes with geogrid | |
| CN106836176B (en) | The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic | |
| CN111733792B (en) | Soft soil foundation vacuum preloading and power consolidation drainage combined foundation treatment method and system | |
| CN106351239A (en) | Cement modified soil strengthened geogrid reinforced soil structure and construction method thereof | |
| CN205223767U (en) | Loose sand bed slope ground embankment structure | |
| CN102168430A (en) | Method for reducing soil pressure on retaining wall in expansive rock-soil area | |
| CN103195051B (en) | Limestone soil and pervious concrete pile composite foundation and treatment method thereof | |
| CN208830325U (en) | A kind of Waste Landfill Site Area mound design structure | |
| CN101109177A (en) | Large-area soft foundation dynamic reinforcement surface mobile filler and its construction method | |
| CN105369797A (en) | Vacuum radiation solidification method for collapsible loess | |
| CN117513298A (en) | A kind of CFG pile composite foundation and construction method for water conservancy projects | |
| CN208803456U (en) | A kind of structure for reinforcing peat soil using sand pile and drain bar | |
| CN106223307B (en) | A kind of physically improved method for combining reduction swelled ground Expansion Potential with load | |
| CN109653240B (en) | Urban residual mud and slag mound in ecological restoration project and its construction method | |
| CN203741813U (en) | Soft soil combined pre-compaction structure | |
| CN107313468A (en) | A kind of seepage proof curtain for releasing collapsible loess foundation settlement by soaking is with level every infiltration level structure and method | |
| CN202787295U (en) | Dispersive pile-permeable concrete pile novel dual compound foundation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080430 |