CN104250946A - High-speed railway subgrade structure for saline soil areas - Google Patents
High-speed railway subgrade structure for saline soil areas Download PDFInfo
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Abstract
The invention belongs to the technical field of high-speed railway subgrade engineering, and particularly relates to a high-speed railway subgrade structure for saline soil areas. The high-speed railway subgrade structure comprises a road cutting structure, wherein the road cutting structure comprises a subgrade bed surface layer and a subgrade bed bottom layer; a partition layer is arranged at the bottom of the subgrade bed bottom layer; a surface drain system is arranged at each of two sides of the road cutting structure, an underground drain system is arranged at the bottom of the surface drain system; the partition layer extends outwards along two sides of the longitudinal direction to intersect the surface drain system or underground drain system. Based on the compact connection of the surface drain system, the underground drain system, the partition layer and the like with the components thereof to achieve special purposes, the high-speed railway subgrade structure is simple, and can effectively cut off capillary water migration pathways between subgrade soil and the road cutting subgrade bed structure, thereby avoiding the problems of salt expansion, break-up expansion, melt sinking and the like and guaranteeing the long-term normal use of high-speed railway subgrade engineering.
Description
Technical field
The invention belongs to high-speed railway subgrade field of engineering technology, be specifically related to a kind of saline soil area High Speed Railway Subgrade.
Background technology
Salinized soil refers to the soil exceeding some in the soil body containing soluble salt, it is a kind of special soils with environmental sensitivity, under the condition of the environmental factor changes such as surface water, underground water and temperature, salinized soil can occur salt swollen, turn over swollen and molten fall into etc. disease, therefore, when high-speed railway is built in saline soil area, very easily roadbed engineering brings adverse influence.Specification clear stipulaties, salinized soil location roadbed should be selected in that physical features is higher, groundwater table is lower, drainage condition is better or in soil, the relatively low location of salt content is passed through, and should pass through in embankment mode, when part location cannot evade with cutting mode by time, then must carry out disease prevention measure.
Existing in saline soil area, there is the mode such as partition and dewatering of excavating and changing and filling out, carry out capillary water to the disease prevention measure that the roadbed passed through in cutting mode is taked.But excavate to change and fill out salt marsh soil layer construction journey amount greatly, need the qualified filler of long distance transportation after excavating, and there is spoir stacking problem, affect environment; And capillary water insulating course adopts the native insulating course of infiltration or sand asphalt insulating course, saline soil area generally lacks the native filler of infiltration, material source difficulty, and requirement is large, cannot meet the requirement of the native insulating course thickness of infiltration 0.5 ~ 1.0m, there is the large problem of construction control difficulty in sand asphalt insulating course simultaneously; Zanjon is dug in dewatering measure many employings both sides, and construction investment is comparatively large, is generally applicable to the relatively poor area of underground water, is not suitable for saline soil area.All there is many deficiencies or defect in visible above-mentioned measure.
Summary of the invention
Object of the present invention is exactly the deficiency existed to solve above-mentioned background technology, there is provided that a kind of structure is simple, the saline soil area High Speed Railway Subgrade of easy construction, can effectively cut off capillary water passage, solve the harm that the various water in saline soil area (containing surface water, underground water, capillary water) is brought high-speed railway.
The technical solution used in the present invention is: a kind of saline soil area High Speed Railway Subgrade, comprise the chasm structuref be made up of surface layer of subgrade bed and bottom layer of subgrade, the bottom of described bottom layer of subgrade is provided with insulating course, described chasm structuref both sides are respectively equipped with surface drainage system, be provided with underdrainage system bottom surface drainage system, described insulating course both sides along the longitudinal direction extend out to crossing with surface drainage system or surface drainage system.
Further, described underdrainage system is be arranged at the permeable ditch bottom insulating course both sides of the edge, described permeable ditch comprises ditch body structure, oozes Drain pipe network and sand gravel pervious layer, described second oozes Drain pipe network is positioned over ditch body structure interior bottom portion, ooze Drain pipe network outsourcing non-woven geotextile, ditch body structure inside sand gravel pervious layer is paved with.
Further, described insulating course comprises three layers, and intermediate layer is antiacid alkali composite geo-membrane or capillary waterproof band drain, is two-layerly up and down medium-sand seam, bottom oblique upper berth to surface drainage system, both sides along the longitudinal direction, intermediate layer.
Further, described ditch body structure is made up of concrete structure, and its longitudinal section is U-shaped structure.
Further, described underdrainage system is to be arranged at bottom gutter and to be positioned at the weeper drain of insulating course both sides, described weeper drain comprises ditch bottom structure and oozes Drain pipe network, oozes Drain pipe network and is positioned over bottom bottom of trench inside configuration, ooze Drain pipe network outer wrap non-woven geotextile; Bottom of trench structural top zone line filling rubble pervious layer, bottom of trench structural top both sides set gradually from the inside to the outside vertical oozes draining gauze pad, medium coarse sand pervious layer; What be also provided with level between bottom described rubble pervious layer top and gutter oozes draining gauze pad.
Further, described insulating course comprises three layers, and intermediate layer is antiacid alkali composite geo-membrane or capillary waterproof band drain, is two-layerly up and down medium-sand seam, and both sides along the longitudinal direction, intermediate layer extend out to weeper drain inside.
Further, described ditch bottom structure is made up of concrete structure, and its longitudinal section is U-shaped structure, and U-shaped structure central bottom is provided with groove, oozes Drain pipe network and is arranged in groove.
Further, described in ooze draining gauze pad and be made up of high strength filament, its thickness is 45-50mm, and void content is more than or equal to 85%.
Further, described in ooze Drain pipe network and be made up of high strength filament, its caliber is 150mm, and tube wall void content is greater than 80%.
Further, described surface drainage system comprises gutter that bottom layer of subgrade both sides arrange along its length and the impervious barrier that surface layer of subgrade bed end face is arranged, and described impervious barrier is bituminous concrete or steel fibrous concrete, and its thickness is 0.07 ~ 0.10m.
Road structure of the present invention adopts the many kinds of measures such as surface drainage system, underdrainage system, insulating course and ingredient thereof to organically combine, tight union, with strong points, structure is simple, effectively can cut off the capillary water migration pathway between foundation soil and cutting foundation bed structure, prevent salinized soil from corroding cutting foundation bed structure and produce salt swollen, turn over the swollen and molten disease such as to fall into, ensure that the long-term normal of high-speed railway subgrade engineering uses.
Simultaneously, compared to existing take to excavate change fill out, dewatering, infiltration soil or the measure such as sand asphalt partition, salinized soil insulating course of the present invention adopts the partition measure based on composite geo-membrane or capillary drainage plate, obviously can reduce construction investment, reduce environment pollution, effectively can prevent the capillary water of salinized soil from corroding cutting, ensure the functional performance that embankment engineering is good.
Further, perfect earth's surface, underdrainage system can moisture fast in drainage foundation soil, and the state making railway bed keep comparatively dry, can prevent salinized soil substrate from occurring the diseases such as softening or salt is swollen, avoid the generation of water damage.
In addition, road structure construction technology of the present invention is simple, and construction quality is easy to ensure, adopts lower cost to solve the technical barrier of saline soil area high-speed railway, has stronger application value.
Accompanying drawing explanation
Fig. 1 is sectional schematic diagram of the present invention (permeable ditch).
Fig. 2 is another kind of sectional schematic diagram (weeper drain) of the present invention.
Fig. 3 is the partial enlarged drawing of Fig. 2.
Fig. 4 is the schematic diagram of permeable ditch of the present invention.
Fig. 5 is the schematic diagram of weeper drain of the present invention.
In figure: 1-chasm structuref, 1.1-surface layer of subgrade bed, 1.2-bottom layer of subgrade; 2-insulating course, 2.1-two-layer up and down, 2.2-intermediate layer; 3-underdrainage system, 3.1-permeable ditch, 3.2-weeper drain; 4-surface drainage system, 4.1-gutter, 4.2-impervious barrier; 5-original place upper thread.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, is convenient to be well understood to the present invention, but they do not form restriction to the present invention.
As Figure 1-3, road structure of the present invention is applicable to the lower position of saline soil area physical features, namely, after road structure is fixed, its end face is lower than original place upper thread 5, therefore it forms primarily of chasm structuref 1, insulating course 2, underdrainage system 3 and surface drainage system 4.Chasm structuref 1 both sides arrange gutter 4.1, and the permeable ditch 3.1 of underdrainage system 3 or weeper drain 3.2 are arranged at both sides gutter 4.1 bottom, and insulating course 2 is arranged at bottom chasm structuref bottom layer of subgrade 1.2.Chasm structuref 1 is made up of surface layer of subgrade bed 1.1 and bottom layer of subgrade 1.2, and the physical dimension of surface layer of subgrade bed 1.1 and bottom layer of subgrade 1.2, wire feeding, compacting criteria should meet " Design of High-speed Railway specification " requirement.Surface layer of subgrade bed and bottom layer of subgrade adopt embankment to put domatic formula, guarantee that surface layer of subgrade bed draining is unobstructed, meet the requirement that high-speed railway subgrade is steady in a long-term under train high-speed cruising and natural conditions.
As shown in Figure 1 and Figure 2, insulating course 2 is arranged at bottom bottom layer of subgrade 1.2, comprises three layers, and intermediate layer 2.2 is antiacid alkali composite geo-membrane or capillary waterproof band drain, two-layer 2.1 is medium-sand seam up and down.Namely insulating course 2 is followed successively by the thick medium-sand seam of 0.1m, antiacid alkali composite geo-membrane or capillary waterproof band drain, medium-sand seam that 0.1m is thick from top to bottom.The thickness of insulating course 2 is not less than 0.2m, and to prevent salinized soil moisture absorption, swollen, the corrosion of pine and corrosion failure, and the capillary water of underground water at the bottom of blocking group is on the impact of roadbed, avoids salinized soil to fill the erosion of cutting bedding to top.
When underdrainage system 3 is permeable ditch 3.1 form, when the antiacid alkali composite geo-membrane in insulating course middle level 2.2 or capillary waterproof band drain are laid, its both sides along the longitudinal direction should be crossing with it bottom oblique upper berth to gutter 4.1, the capillary water of bottom layer of subgrade 1.2 with substrate underground water is separated, avoids salinized soil to fill the erosion of cutting bedding to top.
When underdrainage system 3 is weeper drain 3.2 form, when the antiacid alkali composite geo-membrane in insulating course middle level 2.2 or capillary waterproof band drain are laid, it is inner that its both sides along the longitudinal direction should extend out to weeper drain 3.2, namely the capillary water of bottom layer of subgrade 1.2 with substrate underground water separates by insulating course 2 together with weeper drain 3.2, avoids salinized soil to fill the erosion of cutting bedding to top.
Antiacid alkali composite geo-membrane should have and have long-term corrosion resistance and ageing resistace to sulfate, villaumite, carbonate.Antiacid alkali composite geo-membrane adopts two cloth two membrane structures, is namely followed successively by reinforcement base cloth, PVC film, protection non-woven fabrics, PVC film composition from down to up.Antiacid alkali composite geo-membrane weight per unit area is not less than 950g/m
2(wherein unit area non-woven fabrics quality is not less than 200g/m
2), PVC film and reinforcement composite for base fabric body thickness are not less than 0.6mm, and bidirectional stretch intensity must not be less than 45kN/m, and CBR bursting strength is not less than 5.0kN, and two-way elongation at break is less than 17%, and transmission coefficient should not be greater than 10
-12cm/s, polyvinyl chloride (PVC) content of composite geo-membrane should lower than 20%, and fabric width should be greater than 3.0m.Between antiacid alkali composite earthwork film web, overlap joint adopts welding method, weld width is not less than 10cm, and welding peel strength is not less than 70kN, for ensureing overlap joint seal quality, polypropylene PP split yarn must not be used during the welding of geomembrane material, during bonding, polythene PE film must not be used.
Capillary waterproof band drain adopts polyvinyl chloride (PVC) to support, it is a kind of guarded drainage material collecting capillary water absorption, gravity and siphon drainage, fine grained blocking function can be prevented, single draining slotted eye aperture, capillary waterproof band drain surface is not less than 1.0mm, fluting rate (or percent opening) is not less than 20%, and water-flowing amount is not less than 80cm
3/ ms, base plate tool impermeability (water-resisting property), compressive strength>=300kPa; Tensile strength: longitudinal direction>=12MPa, transverse direction>=4.0MPa; Tearing strength: longitudinal direction>=50kN/m, transverse direction>=15kN/m; Fracture elongation: longitudinally>=150%, laterally>=50%; Puncture intensity>=0.2kN, fabric width is generally greater than 3.0m, thickness is not less than 2.0mm, should have, to sulfate, villaumite, carbonate, there is long-term corrosion resistance and ageing resistace, when PVC capillary waterproof band drain completely spreads, U-shaped nail can be adopted to follow closely admittedly for adjacent drainage channel band overlap joint or heat melts connection, connects width and is not less than 10cm.
Underdrainage system 3 according to underground water development degree, can select the form of permeable ditch 3.1 or weeper drain 3.2.
As Figure 1 and Figure 4, permeable ditch 3.1 is arranged at the bottom of insulating course 2 both sides of the edge, by ditch body structure 3.1.1, oozes the structure such as Drain pipe network 3.1.2, sand gravel pervious layer 3.1.3 and forms.Ditch body structure 3.1.1 is made up of concrete structure, and its longitudinal section is U-shaped structure.Ooze Drain pipe network 3.1.2 to be positioned over bottom ditch body structure 3.1.1, ooze Drain pipe network 3.1.2 outsourcing 200g non-woven geotextile.Ooze Drain pipe network 3.1.2 to be made up of high strength filament, caliber 150mm, pipe ring stiffness is not less than 16kPa, and tube wall void content is greater than 80%.Other position, space sand gravel pervious layer 3.1.3 of ditch body structure 3.1.1 inside is paved with.Non-woven geotextile must be corrosion-resistant, anti-aging, and breaking strength should be not less than 6.5kN/m, and bursting strength is not less than 0.9kN, and tearing strength is not less than 160N, and has good permeable, diafiltration ability, and vertical permeability coefficient is not less than 3.5 × 10
-2cm/s, effective aperture O
95>=0.1mm.
As Fig. 2, as 3, shown in Fig. 5, weeper drain 3.2 to be arranged at bottom gutter 4.1 and to be positioned at insulating course 2 both sides, by ditch bottom structure 3.2.1, ooze Drain pipe network 3.2.2, medium coarse sand pervious layer 3.2.3, ooze draining gauze pad 3.2.4, the structure such as rubble pervious layer 3.2.5 (or boulder and cobble pervious layer) forms.Ditch bottom structure 3.2.1 is positioned at the bottom, be made up of concrete structure, its longitudinal section is U-shaped structure, U-shaped structure central bottom is provided with groove, oozing Drain pipe network 3.2.2 is arranged in groove, ooze Drain pipe network 3.2.2 outer wrap non-woven geotextile, other position, space medium coarse sand pervious layer 3.2.3 in groove is paved with.Zone line filling rubble pervious layer 3.2.5 (or boulder and cobble pervious layer) at ditch bottom structure 3.2.1 top, both sides, ditch bottom structure 3.2.1 top set gradually from the inside to the outside vertical oozes draining gauze pad 3.2.4, medium coarse sand pervious layer 3.2.3, and what arrange level between bottom rubble pervious layer 3.2.5 (or boulder and cobble pervious layer) top and gutter 4.1 oozes draining gauze pad 3.2.4.
Ooze Drain pipe network 3.2.2 to be made up of high strength filament, caliber 150mm, pipe ring stiffness is not less than 16kPa, and tube wall void content is greater than 80%.Non-woven geotextile must be corrosion-resistant, anti-aging, and breaking strength should be not less than 6.5kN/m, and bursting strength is not less than 0.6kN, and tearing strength is not less than 120N, and has good permeable, diafiltration ability, and vertical permeability coefficient is not less than 3.5 × 10
-2cm/s, effective aperture O
95>=0.07mm.Ooze draining gauze pad 3.2.4 to be made up of high strength filament, thickness 50mm, void content is not less than 85%, and when pressure 50kPa, thickness is greater than 45mm.
As shown in Figure 1 and Figure 2, ground waterproof and water drainage system 4 is made up of the impervious barrier 4.2 of both sides gutter 4.1, surface layer of subgrade bed 1.1 end face.Gutter 4.1 is arranged at bottom layer of subgrade 1.2 both sides, and the surface water ejectment collecting subgrade bed scope is to outside roadbed, and block the adverse effect of roadbed side slope surface water to roadbed, gutter 4.1 is generally square-section simultaneously, adopts concrete cast-in-situ.Impervious barrier 4.2 is generally positioned at surface layer of subgrade bed end face, and infiltrate in roadbed filling body to block rainwater, can adopt bituminous concrete, steel fibrous concrete, thickness generally adopts 0.07 ~ 0.10m.
The content be not described in detail in this manual belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. a saline soil area High Speed Railway Subgrade, it is characterized in that: comprise the chasm structuref be made up of surface layer of subgrade bed and bottom layer of subgrade, the bottom of described bottom layer of subgrade is provided with insulating course, described chasm structuref both sides are respectively equipped with surface drainage system, be provided with underdrainage system bottom surface drainage system, described insulating course both sides along the longitudinal direction extend out to crossing with surface drainage system or surface drainage system.
2. saline soil area according to claim 1 High Speed Railway Subgrade, it is characterized in that: described underdrainage system is be arranged at the permeable ditch bottom insulating course both sides of the edge, described permeable ditch comprises ditch body structure, oozes Drain pipe network and sand gravel pervious layer, described second oozes Drain pipe network is positioned over ditch body structure interior bottom portion, ooze Drain pipe network outsourcing non-woven geotextile, ditch body structure inside sand gravel pervious layer is paved with.
3. according to the saline soil area High Speed Railway Subgrade that claim 2 is stated, it is characterized in that: described insulating course comprises three layers, intermediate layer is antiacid alkali composite geo-membrane or capillary waterproof band drain, two-layerly up and down be medium-sand seam, bottom oblique upper berth to surface drainage system, both sides along the longitudinal direction, intermediate layer.
4. saline soil area according to claim 2 High Speed Railway Subgrade, is characterized in that: described ditch body structure is made up of concrete structure, and its longitudinal section is U-shaped structure.
5. saline soil area according to claim 1 High Speed Railway Subgrade, it is characterized in that: described underdrainage system is to be arranged at bottom gutter and to be positioned at the weeper drain of insulating course both sides, described weeper drain comprises ditch bottom structure and oozes Drain pipe network, ooze Drain pipe network to be positioned over bottom bottom of trench inside configuration, ooze Drain pipe network outer wrap non-woven geotextile; Bottom of trench structural top zone line filling rubble pervious layer, bottom of trench structural top both sides set gradually from the inside to the outside vertical oozes draining gauze pad, medium coarse sand pervious layer; What be also provided with level between bottom described rubble pervious layer top and gutter oozes draining gauze pad.
6. saline soil area according to claim 5 High Speed Railway Subgrade, it is characterized in that: described insulating course comprises three layers, intermediate layer is antiacid alkali composite geo-membrane or capillary waterproof band drain, two-layerly up and down be medium-sand seam, both sides along the longitudinal direction, intermediate layer extend out to weeper drain inside.
7. saline soil area according to claim 5 High Speed Railway Subgrade, is characterized in that: described ditch bottom structure is made up of concrete structure, and its longitudinal section is U-shaped structure, and U-shaped structure central bottom is provided with groove, oozes Drain pipe network and is arranged in groove.
8. saline soil area according to claim 5 High Speed Railway Subgrade, is characterized in that: ooze draining gauze pad and be made up of high strength filament, its thickness is 45-50mm, and void content is more than or equal to 85%.
9. the saline soil area High Speed Railway Subgrade according to claim 2 or 5, is characterized in that: described in ooze Drain pipe network and be made up of high strength filament, its caliber is 150mm, and tube wall void content is greater than 80%.
10. saline soil area according to claim 1 High Speed Railway Subgrade, it is characterized in that: described surface drainage system comprises gutter that bottom layer of subgrade both sides arrange along its length and the impervious barrier that surface layer of subgrade bed end face is arranged, described impervious barrier is bituminous concrete or steel fibrous concrete, and its thickness is 0.07 ~ 0.10m.
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| CN105672060A (en) * | 2016-01-18 | 2016-06-15 | 中铁第四勘察设计院集团有限公司 | Inter-line drainage structure for medium-and-low-speed magnetic-levitation low-altitude double-line district |
| CN106245604A (en) * | 2016-08-30 | 2016-12-21 | 山东胜伟园林科技有限公司 | A kind of water-retention is hided salt irrigation canals and ditches device |
| CN106592346A (en) * | 2017-01-22 | 2017-04-26 | 中铁二院工程集团有限责任公司 | Head chute separated type ballastless track cutting bed structure for middle-strong salinized soil areas |
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| CN109781962A (en) * | 2019-01-25 | 2019-05-21 | 中铁二院工程集团有限责任公司 | Based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method |
| CN112083143A (en) * | 2020-08-19 | 2020-12-15 | 上海交通大学 | Design method of capillary water separation layer in sea sand roadbed |
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| CN105672060A (en) * | 2016-01-18 | 2016-06-15 | 中铁第四勘察设计院集团有限公司 | Inter-line drainage structure for medium-and-low-speed magnetic-levitation low-altitude double-line district |
| CN106245604A (en) * | 2016-08-30 | 2016-12-21 | 山东胜伟园林科技有限公司 | A kind of water-retention is hided salt irrigation canals and ditches device |
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| CN106592346A (en) * | 2017-01-22 | 2017-04-26 | 中铁二院工程集团有限责任公司 | Head chute separated type ballastless track cutting bed structure for middle-strong salinized soil areas |
| CN107101674B (en) * | 2017-06-19 | 2023-08-04 | 中铁六局集团有限公司 | Real-scale test platform for simulating temperature stress effect of ballastless track and construction method |
| CN107101674A (en) * | 2017-06-19 | 2017-08-29 | 中铁六局集团有限公司 | Simulate the real chi test platform and construction method of non-fragment orbit temperature stress effect |
| CN108984923A (en) * | 2018-07-24 | 2018-12-11 | 中铁二院工程集团有限责任公司 | A kind of salinized soil cutting foundation bed structure design method based on protuberance Deformation control |
| CN109235475A (en) * | 2018-09-10 | 2019-01-18 | 中铁二院工程集团有限责任公司 | A kind of high-speed railway cutting subdrainage educates the construction method of ditch |
| CN109235475B (en) * | 2018-09-10 | 2024-03-22 | 中铁二院工程集团有限责任公司 | Construction method of underground drainage blind ditch of high-speed railway cutting |
| CN109781962A (en) * | 2019-01-25 | 2019-05-21 | 中铁二院工程集团有限责任公司 | Based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method |
| CN112083143A (en) * | 2020-08-19 | 2020-12-15 | 上海交通大学 | Design method of capillary water separation layer in sea sand roadbed |
| CN112900177A (en) * | 2021-02-02 | 2021-06-04 | 青海省交通投资有限公司 | Composite geomembrane salt-separating water-blocking partition layer structure |
| CN114687253A (en) * | 2022-03-03 | 2022-07-01 | 中国土木工程集团有限公司 | Ballastless track railway roadbed waterproof structure and construction method |
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Application publication date: 20141231 |