CN102888833A - Method for reinforcing soft ground by combining vacuum preloading and surcharge vibration rolling - Google Patents
Method for reinforcing soft ground by combining vacuum preloading and surcharge vibration rolling Download PDFInfo
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- CN102888833A CN102888833A CN2011104495739A CN201110449573A CN102888833A CN 102888833 A CN102888833 A CN 102888833A CN 2011104495739 A CN2011104495739 A CN 2011104495739A CN 201110449573 A CN201110449573 A CN 201110449573A CN 102888833 A CN102888833 A CN 102888833A
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Abstract
The invention discloses a method for reinforcing a soft ground by combining vacuum preloading and surcharge vibration rolling. The method comprises the following steps of: inserting a vertical draining plate, paving a medium-coarse sand cushion layer, digging a sealing ditch, and simultaneously, paving a horizontal draining pipe; and paving a horizontal water filtering pipe in the medium-coarse sand cushion layer, paving a vacuum film on the medium-coarse sand cushion layer, backfilling the sealing ditch, setting a measurement mark, arranging a vacuum pump, performing pressure stabilization after the vacuum pressure below the vacuum film reaches 85 kPa, performing backfilling by using pond residues, performing surcharge preloading, finishing surcharge preloading after a control requirement is met, and compacting soil on the surface layer through impaction and vibration rolling. Compared with the prior art, the method has the advantages that the soft ground is reinforced by combining vacuum preloading and surcharge vibration rolling, so that the original ground processing method through vacuum preloading or surcharge vibration rolling can be effectively improved, the cost of a ground processing project can be reduced, a construction period is shortened, and great significance is provided for improving the structural performance of the ground and the ground bearing capacity.
Description
Technical field
The present invention relates to the Soft Soil Subgrade Treatment Techniques field in the large-sized workshop construction, particularly relate to the method that the vacuum-surcharge preloading vibroroller cmpacting is reinforced subgrade.
Background technology
At present, along with the development of economy, the continuous minimizing of coastal area construction land, this causes will continuing to increase the utilization of beach wetland, and building large-sized workshop at the beach wetland is that traditional method for processing foundation all is less compliant in such area and uses.Load such as vacuum preloading loads soon, short construction period, but load is no more than 100Kpa, and load is less than normal.And the load of piling prepressing is larger, but it is long in time limit, needs a large amount of prepressing materials.If adopt CFG stake, square pile composite double layer Roofing slab etc. to be not easy to ram machine construction, and construction period is longer, cost is higher.
Summary of the invention
Technical problem to be solved by this invention is the deficiency when overcoming existing method for processing foundation soft ground treatment, provide a kind of vacuum-surcharge preloading vibroroller cmpacting to reinforce the method for subgrade, short construction period, the loading speed of the method are fast, can not occur the phenomenon of foundation instability in the loading.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
Vacuum-surcharge preloading vibroroller cmpacting of the present invention is reinforced the method for subgrade:
(1) smooth location, inserted to play draining riser, laying depth are the medium coarse sand bed course of 0.35～0.45m, then widen the sideline outer rim in the place and dig the sealing ditch, lay simultaneously horizontal drain pipe;
(2) in the medium coarse sand bed course, lay horizontal filtration pipe, the medium coarse sand covering layer that 0.1～0.2mm is arranged on the horizontal filtration pipe, lay vacuum diaphragm at the medium coarse sand bed course, then will seal trench backfill, survey mark is set, vacuum pump is installed, examination vacuumizes without behind the gas leak phenomenon, voltage stabilizing after vacuum pressure reaches 85Kpa under the vacuum diaphragm, voltage stabilizing were laid pool slag blanket after 8～12 days on the film, thickness 1.5～2.5m, carry out during this time vacuum, the settling amount monitoring is also drawn the S-t curve, stops to vacuumize precompressed wait reaching after control requires, and then adopts 18T impact shock rolling machine to carry out soil compaction, roll 2 ~ 3 times, after compactness reaches more than 90%, stop vibroroller cmpacting, the vacuum-surcharge preloading vibroroller cmpacting is reinforced subgrade and is finished.
Above-mentioned vacuum-surcharge preloading vibroroller cmpacting is reinforced in the method for subgrade, and the thickness of described medium coarse sand bed course is 0.4m.When laying vacuum diaphragm, vacuum diaphragm monolithic construction area is not less than 18000 ㎡, and the vacuum diaphragm single-block area is not less than 9000 ㎡.
Compared with prior art, the present invention unites to come strengthening soft foundation with vacuum preloading and preloading vibroroller cmpacting, can effectively promote original vacuum preloading or preloading vibroroller cmpacting method for processing foundation, can not only reduce cost, the shortening construction period of foundation treatment engineering, and to improving the foundation structure performance, improving the bearing capacity of foundation soil important in inhibiting, have advantages of as follows:
1, loading speed fast, need not too much preloading material; 2, the foundation instability phenomenon can not appear in the loading; 3, remedy simultaneously prefabricating load (being no more than 100KPA) less than normal and preloading duration of vacuum preloading relatively long, needed the defective of a large amount of prepressing materials.4, the single width membrane area is large, reaches 9000 ㎡; 5, every subregion ground stabilization processing area is large, reaches 18000 ㎡ (200mX90m).
The specific embodiment
1, measures unwrapping wire
Emit the accurate location in each reinforcement elements sideline with timber or little bamboo bar and albarium, and with red lacquer on timber or small bamboo, and mark the absolute altitude of sand cushion end face; Between timber and the small bamboo also available red nylon rope be connected.
2, inserted to play plastic draining board
At first carry out levelling of the land, (the vacuum preloading regulation and stipulation is generally 1～20,000 m according to place thickness of soft soil, layering situation, data from in-situ, vacuum construction ability
2Be a residential quarter) divide the surcharge preloading district, desurfacing is ploughed soil and mud, carries out levelling of the land.
Then, inserted to play draining riser positions according to the design arrangement figure of plastic draining board, plastic tape is passed from shoe by conduit again, plastic tape is connected with pile top is adjacent to shoe and align piles position, start beats sleeve pipe to projected depth, then pull out sleeve pipe on to ground, cut off plastic tape.Displacement repeats above step.
3, lay sand cushion, excavation sealing ditch
Laying depth is the medium coarse sand bed course (mud content is less than 5%) of 0.4m, pushes away concora crush with bulldozer real, avoids during the precompressed mat surface out-of-flatness and affect posterior settlement observing.
Seal ditch around the excavation, about sealing furrow width 0.8m, be positioned at and widen the sideline outer rim, need carry out gutter drainage when being difficult to grooving because water content is high, for the thicker zone of slag, the pool, top layer, should suitably remove pool slag and change with sand and fill out.When digging the sealing ditch, can carry out connection and the installation of horizontal drain pipe and bury underground.
4, vacuum prepressing system is installed
(1) lays horizontal filtration pipe
The drainage of filter pipe partly is drilled with the treatment hole of 8～10mm, pitch-row 5cm, and rounded projections arranged, filter pipe is outer around the 3mm galvanized wire, and the outsourcing filtering material consists of the drainage layer.The layout of filter pipe generally takes bar shaped or fishbone type to arrange.The array pitch of filter pipe is generally 6m～10m, and the distance of outermost layer filter pipe distance field rand is 2～5m.Connection between the filter pipe is taked to be flexible coupling, to adapt to the place sedimentation.
Filter pipe is embedded in the middle part of horizontal drainage sand cushion, and 0.1～0.2mm sand covering layer should be arranged on it, to prevent that sharp object punctures diaphragm seal on the filter pipe.
(2) lay vacuum diaphragm: general two films, two cloth that adopt of vacuum diaphragm structure
Each one deck geotextiles under the film on the film, vacuum diaphragm thickness are that 0.12～0.14mm and geotextiles are 250g/m
2Short silk non-woven geotextile.Before the construction of first floor non-woven geotextile, sharp material will be cleaned out on the permutite bed course, then repaves nonwoven, must not leak the shop, when spreading diaphragm seal, integral body to move ahead simultaneously, avoids bumping the sealer of decoding.When spreading layer geotextiles, the constructor should wear soft sole.After laying diaphragm seal, the sealing ditch will be with mud or clay backfilling.
(3) survey mark is set
According to the site operation requirement, pore water pressure observation, settlement observation, horizontal displacement observation, vacuum observation will be set.According to the monitored data-time changing curve of measuring point, inverse consolidation of soil coefficient, the degree of consolidation of reckoning different time.Judge soil body situation of change, the control rate of loading avoids loading too fast and cause foundation failure.
(4) vacuum pump is installed
The layout of vacuum extractor is decided on the ability of reinforcing area and fluidic device.Arranging should be evenly.Vacuum extractor can be born 1000～1500m at During Initial Stage Construction
2The reinforcing area, the later stage can be born 1500～2000m
2The reinforcing area.Its quantity is to guarantee that design vacuum is as standard in the vacuum diaphragm.
5, vacuumize precompressed
After examination vacuumizes and there is no gas leak phenomenon, voltage stabilizing after vacuum pressure reaches 85kPa under the film, the water of extraction should in time be discharged outside the venue, can not return to be discharged on the film in case affect the construction of postorder backfill.
6, surveillance and monitoring
The test request of dynamically observing
7, preloading vacuum rolls
The vacuum preloading voltage stabilizing is returned pool slag and is carried out surcharge preloading after 10 days, pool slag thickness is 2m.Should be very careful during backfill, lay first sand cushion, sand cushion should adopt artificial piecemeal to pave, and can not use the heavy mechanical equipment construction, in order to avoid damage vacuum diaphragm cloth.
Carry out vacuum, settling amount monitoring during the surcharge preloading, and draw the S-t curve, stop surcharge preloading wait reaching after control requires.
Adopt impact shock to roll (carrying out 2～3 times) compacting top layer soil body (when absolute altitude is not enough, but back-filling in layers pool slag), compactness need reach more than 90%.
Claims (3)
1. the vacuum-surcharge preloading vibroroller cmpacting is reinforced the method for subgrade, it is characterized in that:
(1) smooth location, inserted to play draining riser, laying depth are the medium coarse sand bed course of 0.35～0.45m, then widen the sideline outer rim in the place and dig the sealing ditch, lay simultaneously horizontal drain pipe;
(2) in the medium coarse sand bed course, lay horizontal filtration pipe, the medium coarse sand covering layer that 0.1～0.2mm is arranged on the horizontal filtration pipe, lay vacuum diaphragm at the medium coarse sand bed course, then will seal trench backfill, survey mark is set, vacuum pump is installed, examination vacuumizes without behind the gas leak phenomenon, voltage stabilizing after vacuum pressure reaches 85Kpa under the vacuum diaphragm, voltage stabilizing were laid pool slag blanket after 8～12 days on the film, thickness 1.5～2.5m, carry out during this time vacuum, the settling amount monitoring is also drawn the S-t curve, stops to vacuumize precompressed wait reaching after control requires, and then adopts 18T impact shock rolling machine to carry out soil compaction, roll 2 ~ 3 times, after compactness reaches more than 90%, stop vibroroller cmpacting, the vacuum-surcharge preloading vibroroller cmpacting is reinforced subgrade and is finished.
2. the method for reinforcing subgrade according to the described vacuum-surcharge preloading vibroroller cmpacting of claim 1, it is characterized in that: the thickness of described medium coarse sand bed course is 0.4m.
3. the method for reinforcing subgrade according to the described vacuum-surcharge preloading vibroroller cmpacting of claim 1 is characterized in that: when laying vacuum diaphragm, vacuum diaphragm monolithic construction area is not less than 18000 ㎡, and the vacuum diaphragm single-block area is not less than 9000 ㎡.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104495739A CN102888833A (en) | 2011-12-29 | 2011-12-29 | Method for reinforcing soft ground by combining vacuum preloading and surcharge vibration rolling |
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| CN2011104495739A CN102888833A (en) | 2011-12-29 | 2011-12-29 | Method for reinforcing soft ground by combining vacuum preloading and surcharge vibration rolling |
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| CN102888833A true CN102888833A (en) | 2013-01-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924578A (en) * | 2014-04-22 | 2014-07-16 | 上海市基础工程集团有限公司 | Arrangement and operation method of vacuum pumps for efficient large-area foundation treatment |
| CN104846801A (en) * | 2015-03-19 | 2015-08-19 | 南通大学 | Plastic-drainage-plate soft soil roadbed processing construction method |
| CN103628468B (en) * | 2013-12-24 | 2015-09-16 | 山东大学 | A kind of water penetration pile combined vacuum prepressing ground foundation treatment method |
| CN110747840A (en) * | 2019-10-25 | 2020-02-04 | 中交四航局广州南沙工程有限公司 | Vacuum combined surcharge-load prepressing soft foundation reinforcing construction method |
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| CN86107233A (en) * | 1986-10-24 | 1988-02-24 | 交通部第一航务二程局科学研究所 | Vacuum combined stack-load method for pre-pressing and reinforcing soft earth foundation |
| JP3406575B2 (en) * | 2000-06-16 | 2003-05-12 | 大洋基礎株式会社 | Ground improvement method |
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2011
- 2011-12-29 CN CN2011104495739A patent/CN102888833A/en active Pending
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| CN86107233A (en) * | 1986-10-24 | 1988-02-24 | 交通部第一航务二程局科学研究所 | Vacuum combined stack-load method for pre-pressing and reinforcing soft earth foundation |
| JP3406575B2 (en) * | 2000-06-16 | 2003-05-12 | 大洋基礎株式会社 | Ground improvement method |
| CN101191329A (en) * | 2006-11-26 | 2008-06-04 | 任再永 | Air flow filling and sucking type foundation draining method |
| CN101220598A (en) * | 2007-11-02 | 2008-07-16 | 广州市盛洲实业有限公司 | Vacuum preloading method for non-water discharge sand cushion |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628468B (en) * | 2013-12-24 | 2015-09-16 | 山东大学 | A kind of water penetration pile combined vacuum prepressing ground foundation treatment method |
| CN103924578A (en) * | 2014-04-22 | 2014-07-16 | 上海市基础工程集团有限公司 | Arrangement and operation method of vacuum pumps for efficient large-area foundation treatment |
| CN104846801A (en) * | 2015-03-19 | 2015-08-19 | 南通大学 | Plastic-drainage-plate soft soil roadbed processing construction method |
| CN110747840A (en) * | 2019-10-25 | 2020-02-04 | 中交四航局广州南沙工程有限公司 | Vacuum combined surcharge-load prepressing soft foundation reinforcing construction method |
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