CN103774515A - High speed railway embankment structure in salty soil regions - Google Patents
High speed railway embankment structure in salty soil regions Download PDFInfo
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Abstract
The invention discloses a high speed railway embankment structure in salty soil regions. The high speed railway embankment structure comprises a ground stabilization body arranged in soft foundation, wherein a reinforced mattress layer is laid above the ground stabilization body; a salty soil isolation layer is laid above the reinforced mattress layer; a filling embankment is laid above the salty soil isolation layer. The high speed railway embankment structure is simple in structure and convenient to construct, the reinforced mattress layer on the base is fully utilized as a carrier, the isolation measures are taken through the salty soil isolation layer made by taking a composite geomembrane or a capillary drain board as a main body, the high speed railway embankment structure is small in layer thickness and relatively low in material price and has obvious advantages compared with the measures of excavating a great quantity of salty oil, reducing underground water level, permeating water and soil or isolating asphaltic sand, the project investment can be obviously reduced, the environmental pollution is alleviated, capillary water of the salty oil can be effectively prevented from eroding the embankment body, and high service performance and long-term stability of the embankment engineering are guaranteed.
Description
Technical field
The present invention relates to high-speed railway subgrade engineering field, refer to particularly a kind of high-speed railway embankment structure of saline soil area.
Background technology
Salinized soil refers to the general designation of salinization of soil soil in various degree, all has distribution at China's inland arid, semiarid zone and coastal region.According to the difference of saliferous type and salt content, salinized soil has the undesirable feature such as moisture absorption, pine is swollen, corrosion, corrosion in various degree, while therefore building high-speed railway in saline soil area, easily causes the generation of subgrade defect, even jeopardizes the normal operation of train.
Salinized soil location roadbed should be taken measures at aspects such as depth of fill, roadbed filling, ground processing, side slope protection reinforcing and capillary water partitions, to guarantee the stable of roadbed.Wherein, aspect ground processing, major measure has the salt marsh of excavating soil layer, capillary water insulating course, dewatering and drainage measure etc. is set.Excavate and change that to fill out salt marsh soil layer measures engineering amount large, general salinized soil spreading depth needs qualified filler far away more than being generally greater than 1.0m after excavating, and exists spoir to stack problem, easily affects environment.Traditional capillary water insulating course comprises the native insulating course of infiltration, sand asphalt insulating course etc., saline soil area generally lacks the native filler of infiltration, material source difficulty, and requirement is large, the native insulating course thickness of general infiltration 0.5～1.0m there is the problem that construction control difficulty is large in sand asphalt insulating course simultaneously.Dewatering measure is applicable to the relatively poor area of underground water more, and construction investment is relatively large.
All there is many deficiencies or defect in visible above-mentioned measure, need improve prior art.
Summary of the invention
Object of the present invention is exactly the deficiency that will solve above-mentioned background technology, and a kind of high-speed railway embankment structure of saline soil area is provided.
Technical scheme of the present invention is: a kind of high-speed railway embankment structure of saline soil area, it comprises the ground stabilization body being arranged in soft foundation, it is characterized in that: described ground stabilization body top is equipped with reinforcement mattress layer, described reinforcement mattress layer top is equipped with salinized soil insulating course, and described railway embankment using is laid on described salinized soil insulating course top.
In such scheme:
Described ground stabilization body comprises multiple reinforcing piles that are arranged in soft foundation, and described reinforcing pile is cement mixing method, rotary churning pile, CFG stake, pile tube, plain concrete pile or bored pile; The stake top of described reinforcing pile is provided with pile cover, and described pile cover is up big and down small reverse frustoconic or cuboid.
The mode that described reinforcement mattress layer and salinized soil insulating course adopt horizontal mode or be arranged to 4% the gradient to both sides centered by circuit is laid.
Described reinforcement mattress layer comprises the first macadam, the first medium-sand seam, geo-grid, the second medium-sand seam and the second macadam that set gradually from bottom to up.
The each inflection in described geo-grid two ends is no less than 2m, and the ultimate tensile strength of described geo-grid is not less than 50kN/m.
Preferably, described salinized soil insulating course comprises the 3rd medium-sand seam setting gradually from bottom to up, antiacid alkali composite geo-membrane and the 4th medium-sand seam; The two ends of described antiacid alkali composite geo-membrane are not less than 1.0m along the domatic each inflection length of embankment.
Described salinized soil insulating course comprises the 3rd medium-sand seam, capillary waterproof band drain and the 4th medium-sand seam that set gradually from bottom to up; The two ends of described capillary waterproof band drain are not less than 1.0m along the domatic each inflection length of embankment.
Described embankment body comprises the following roadbed of surface layer of subgrade bed, bottom layer of subgrade and bedding of laying successively from top to bottom.
Also be provided with slope protection structure, described slope protection structure comprises slope structure and pin wall, described slope structure is laid on side slope of embankment, described pin wall is arranged on the bottom of slope structure, described pin wall part more than ground has been horizontally disposed with multiple spilled water holes by being not less than 0.2m interval, and described spilled water hole has 4% the gradient.
Also be provided with discharge structure, described discharge structure comprises draining inclined hole, gutter and impervious barrier, and described draining inclined hole is uniformly-spaced opened in side slope of embankment; Described gutter is arranged at toe place, embankment one or both sides side; Described impervious barrier is arranged on the end face of embankment body.
The high-speed railway embankment structure of a kind of saline soil area provided by the invention, it is simple in structure, easy construction, making full use of substrate reinforcement mattress layer is carrier, adopt the salinized soil insulating course of making that composite geo-membrane or capillary drainage plate are main body to carry out partition measure, its bed thickness is little, material is relatively inexpensive, than taking a large amount of salinized soil of excavating, dewatering, the measures such as infiltration soil or sand asphalt partition have obvious advantage, can obviously reduce construction investment, reduce environment pollution, the capillary water that can effectively prevent again salinized soil corrodes embankment noumenon, the functional performance that assurance embankment engineering is good and long-term stability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention that embankment raising is less than 3m;
Fig. 2 is the structural representation of the present invention that embankment raising is greater than 3m.
Fig. 3 is reinforcement mattress layer and salinized soil insulating course combining structure schematic diagram in the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Reference as figure, a kind of high-speed railway embankment structure of saline soil area, it comprises the ground stabilization body 1 being arranged in soft foundation, ground stabilization body 1 top is equipped with reinforcement mattress layer 2, reinforcement mattress layer 2 tops are equipped with salinized soil insulating course 3, and railway embankment using 4 is laid on salinized soil insulating course 3 tops.
In the present embodiment:
Salinized soil insulating course 3 is arranged at reinforcement mattress layer 2 tops, take reinforcement mattress layer 2 as basis, has both been conducive to construction, can obviously reduce again insulating course thickness, reduces construction investment.The effect of salinized soil insulating course 3 is to prevent salinized soil moisture absorption, swollen, the corrosion of pine and corrosion failure, and the impact of the capillary water of underground water on roadbed at the bottom of blocking group, avoids the aggressivity of salinized soil to top railway embankment using.
The gross thickness of salinized soil insulating course 3 is generally not less than 0.2m, and it comprises thick the 3rd medium-sand seam 3.1, antiacid alkali composite geo-membrane or capillary waterproof band drain 3.2 and the 4th thick medium-sand seam 3.3 of 0.1m of 0.1m setting gradually from bottom to up.
In the time laying antiacid alkali composite geo-membrane or capillary waterproof band drain, the two ends of antiacid alkali composite geo-membrane or capillary waterproof band drain are not less than 1.0m along the domatic each inflection length of embankment.
Anti-soda acid composite geo-membrane should have sulfate, villaumite, carbonate are had to long-term corrosion resistance and ageing resistace.Anti-soda acid composite geo-membrane adopts two cloth two membrane structures, is followed successively by from down to up reinforcement base cloth, PVC film, protection nonwoven, PVC film composition.Anti-soda acid composite geo-membrane weight per unit area be not less than 950g/m2(wherein unit area non-woven fabrics quality be not less than 200g/m2), PVC film and reinforcement composite for base fabric body thickness are not less than 0.6mm, bidirectional stretch intensity must not be less than 45kN/m, CBR bursting strength is not less than 5.0kN, two-way elongation at break is less than 17%, transmission coefficient should not be greater than 10-12cm/s, and polyvinyl chloride (PVC) content of composite geo-membrane should be lower than 20%, and fabric width should be greater than 3.0m.Between anti-soda acid composite geo-membrane width, overlap joint adopts welding method, weld width is not less than 10cm, and welding peel strength is not less than 70kN, for guaranteeing overlap joint sealing quality, when the welding of geomembrane material, polypropylene PP split yarn must not be used, when bonding, polythene PE film must not be used.
Capillary waterproof band drain adopts polyvinyl chloride (PVC) to support, it is a kind of anti-adrainage material that collects capillary water absorption, gravity and siphon drainage, can prevent fine grained obstruction function, 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%, water-flowing amount is not less than 80cm3/ms, base plate tool impermeability (water-resisting property), compressive strength >=300kPa; Tensile strength: longitudinally >=12MPa, laterally >=4.0MPa; Tearing strength: longitudinally >=50kN/m, laterally >=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 sulfate, villaumite, carbonate are had to long-term corrosion resistance and ageing resistace, when PVC capillary waterproof band drain completely spreads, adjacent drainage channel band overlap joint can adopt U-shaped nail nail admittedly or heat is melted connection, connects width and is not less than 10cm.
With reference to figure 2, in the time that embankment raising is greater than 3m, embankment body 4 comprises the following roadbed 4.3 of surface layer of subgrade bed 4.1, bottom layer of subgrade 4.2 and bedding of laying successively from top to bottom, and the physical dimension of each several part, filler type, compacting criteria should meet " Design of High-speed Railway standard " requirement.
With reference to figure 1, when embankment raising is less than 3m, can lay the following roadbed 4.3 of bedding.
Also be provided with slope protection structure, slope protection structure comprises slope structure 5.1 and pin wall 5.2, slope structure 5.1 is laid on side slope of embankment, slope structure 5.1 can adopt hollow brick, the concrete form such as skeleton or concrete grass planting window that intercepts water, the hollow area of slope structure 5.1 adopts soil moved in to improve the original grass planting (or shrub) form to carry out Green Protection, thereby can avoid the stability of side slope of embankment and avoid rain drop erosion, and reaching the effect of environmental protection.Pin wall 5.2 is arranged on the bottom of slope structure 5.1, and pin wall 5.2 part more than ground has been horizontally disposed with multiple spilled water holes 5.3 by being not less than 0.2m interval, and spilled water hole 5.3 has 4% the gradient.
Also be provided with discharge structure, discharge structure comprises draining inclined hole 6.1, gutter 6.2 and impervious barrier 6.3, draining inclined hole 6.1 is uniformly-spaced opened in side slope of embankment, in order to get rid of slope underground water, strengthen the stability of side slope, draining inclined hole 6.1 should be coordinated mutually with the drainage channel of slope protection structure, smoothly the moisture in embankment noumenon is got rid of; Draining inclined hole 6.1 apertures are generally 110mm, and the boring elevation angle is generally 5～15 °, dark 2～4m.The thread Drain pipe network that oozes of the built-in high strength of draining inclined hole 6.1, caliber 100mm, ring stiffness is not less than 16kPa, and tube wall porosity is greater than 80%.The thread Drain pipe network outsourcing nonweaven geotextile that oozes of high strength, nonweaven geotextile must be corrosion-resistant, anti-aging, breaking strength should be not less than 6.5kN/m, bursting strength is not less than 0.9kN, tearing strength is not less than 160N, should have good permeable, diafiltration ability, vertical transmission coefficient is not less than 3.5 × 10-2cm/s, effective aperture O95 >=0.1mm.
Gutter 6.2 is arranged at side 2.0m place of toe place, embankment one or both sides, collects the surface water ejectment of roadbed scope to roadbed, blocks the adverse effect of roadbed appearance water to roadbed simultaneously.The general trapezoid cross section that adopts, gutter 6.2, can adopt concrete cast-in-situ, prefabricated section splicing or mortar flag stone to build by laying bricks or stones.
Impervious barrier 6.3 is arranged on the end face of embankment body 4, infiltrates in roadbed filling body to reduce table water, can adopt bituminous concrete, steel fibrous concrete, and thickness generally adopts 0.07～0.10m.
The invention has the advantages that:
(1) salinized soil insulating course 3 is arranged at reinforcement mattress layer 2 tops, form one with reinforcement mattress layer 2, both be conducive to construction, can obviously reduce salinized soil insulating course 3 thickness, to reduce construction investment, the impact of the capillary water that reaches salinized soil at the bottom of effective blocking group on Roadbed Soil, prevents salinized soil moisture absorption, pine is swollen, corrosion and corrosion failure, and guarantees the long-time stability of high-speed railway subgrade;
(2) make full use of reinforcement mattress layer 2 for carrier, adopt the partition measure that composite geo-membrane or capillary drainage plate are main body, its bed thickness little (0.1m medium-sand seam and one deck composite geo-membrane/capillary drainage plate), material is relatively inexpensive, excavate the measure such as salinized soil, dewatering or infiltration soil or sand asphalt partition and have obvious advantage in a large number than taking, can obviously reduce construction investment, reduce environment pollution;
(3), by the draining inclined hole arranging in side slope of embankment, the moisture in drainage side slope of embankment fast, makes roadbed for a long time in dry or middle wet condition, prevents that softening or frost failure from appearring in subgrade in salty soil zone, guaranteed the stability of side slope of embankment.
(4) easy construction of the present invention, roadbed quality is easy to guarantee, has stronger application value.
Claims (10)
1. the high-speed railway embankment structure of a saline soil area, it comprises the ground stabilization body (1) being arranged in soft foundation, it is characterized in that: described ground stabilization body (1) top is equipped with reinforcement mattress layer (2), described reinforcement mattress layer (2) top is equipped with salinized soil insulating course (3), and described railway embankment using (4) is laid on described salinized soil insulating course (3) top.
2. the high-speed railway embankment structure of a kind of saline soil area according to claim 1, it is characterized in that: described ground stabilization body (1) comprises multiple reinforcing piles (1.1) that are arranged in soft foundation, and described reinforcing pile (1.1) is cement mixing method, rotary churning pile, CFG stake, pile tube, plain concrete pile or bored pile; The stake top of described reinforcing pile (1.1) is provided with pile cover (1.2), and described pile cover (1.2) is up big and down small reverse frustoconic or cuboid.
3. the high-speed railway embankment structure of a kind of saline soil area according to claim 1, is characterized in that: the mode that described reinforcement mattress layer (2) and salinized soil insulating course (3) adopt horizontal mode or be arranged to 4% the gradient to both sides centered by circuit is laid.
4. according to the high-speed railway embankment structure of a kind of saline soil area described in claim 1 or 3, it is characterized in that: described reinforcement mattress layer (2) comprises the first macadam (2.1), the first medium-sand seam (2.2), geo-grid (2.3), the second medium-sand seam (2.4) and the second macadam (2.5) that set gradually from bottom to up.
5. the high-speed railway embankment structure of saline soil area according to claim 4, is characterized in that: the each inflection in described geo-grid (2.3) two ends is no less than 2m, and the ultimate tensile strength of described geo-grid is not less than 50kN/m.
6. according to the high-speed railway embankment structure of a kind of saline soil area described in claim 1 or 3, it is characterized in that: described salinized soil insulating course (3) comprises the 3rd medium-sand seam (3.1), antiacid alkali composite geo-membrane (3.2) and the 4th medium-sand seam (3.3) that set gradually from bottom to up; The two ends of described antiacid alkali composite geo-membrane (3.2) are not less than 1.0m along the domatic each inflection length of embankment.
7. according to the high-speed railway embankment structure of a kind of saline soil area described in claim 1 or 3, it is characterized in that: described salinized soil insulating course (3) comprises the 3rd medium-sand seam (3.1), capillary waterproof band drain (3.2) and the 4th medium-sand seam (3.3) that set gradually from bottom to up; The two ends of described capillary waterproof band drain (3.2) are not less than 1.0m along the domatic each inflection length of embankment.
8. the high-speed railway embankment structure of a kind of saline soil area according to claim 1, is characterized in that: described embankment body (4) comprises surface layer of subgrade bed (4.1), bottom layer of subgrade (4.2) and the following roadbed of bedding (4.3) laid successively from top to bottom.
9. the high-speed railway embankment structure of a kind of saline soil area according to claim 1, it is characterized in that: be also provided with slope protection structure, described slope protection structure comprises slope structure (5.1) and pin wall (5.2), described slope structure (5.1) is laid on side slope of embankment, described pin wall (5.2) is arranged on the bottom of slope structure (5.1), described pin wall (5.2) part more than ground has been horizontally disposed with multiple spilled water holes (5.3) by being not less than 0.2m interval, and described spilled water hole (5.3) has 4% the gradient.
10. the high-speed railway embankment structure of a kind of saline soil area according to claim 1, it is characterized in that: be also provided with discharge structure, described discharge structure comprises draining inclined hole (6.1), gutter (6.2) and impervious barrier (6.3), and described draining inclined hole (6.1) is uniformly-spaced opened in side slope of embankment; Described gutter (6.2) is arranged at toe place, embankment one or both sides side; Described impervious barrier (6.3) is arranged on the end face of embankment body (4).
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| CN107938454A (en) * | 2016-10-12 | 2018-04-20 | 新疆铁道勘察设计院有限公司 | Utilize the filling roadbed method of rock salt |
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| CN106988179A (en) * | 2017-03-21 | 2017-07-28 | 中冶天工集团有限公司 | A kind of road structure for preventing salinized soil from corroding and its construction method |
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| CN107419630A (en) * | 2017-06-13 | 2017-12-01 | 华中科技大学 | A kind of the soft soil foundation high-filled embankment and construction method of effectively control settlement after construction |
| CN107419630B (en) * | 2017-06-13 | 2023-06-20 | 华中科技大学 | Soft soil foundation high-filling embankment capable of effectively controlling post-construction settlement and construction method |
| CN109505201A (en) * | 2018-12-25 | 2019-03-22 | 中铁二院工程集团有限责任公司 | A kind of seasonal frozen soil region non-fragment orbit high-speed railway immersion roadbed anti-freeze expansion structure |
| CN110438914B (en) * | 2019-07-01 | 2021-04-30 | 中国葛洲坝集团第一工程有限公司 | Water passing box culvert on soft soil foundation and construction method thereof |
| CN110438914A (en) * | 2019-07-01 | 2019-11-12 | 中国葛洲坝集团第一工程有限公司 | Water tank culvert and its construction method are crossed on soft soil foundation |
| CN110644309A (en) * | 2019-09-26 | 2020-01-03 | 山东大学 | Roadbed drainage structure, system and construction method |
| CN111101413A (en) * | 2020-02-03 | 2020-05-05 | 甘肃省公路工程质量试验检测中心有限公司 | Device applied to salinized soil subgrade in seasonal frozen soil area and construction method |
| CN111218862A (en) * | 2020-03-04 | 2020-06-02 | 中铁二院工程集团有限责任公司 | High-speed railway saline soil filler embankment structure and construction method |
| CN111364495A (en) * | 2020-03-16 | 2020-07-03 | 白城师范学院 | Anti-frost-heaving and anti-seismic composite foundation structure |
| CN114763685A (en) * | 2021-01-11 | 2022-07-19 | 新疆北新路桥集团股份有限公司 | Anti-deformation road structure |
| CN112921731A (en) * | 2021-01-28 | 2021-06-08 | 武汉大学 | Reinforced gravel pile supported EPS light embankment structure in soft soil area and construction method |
| CN112921731B (en) * | 2021-01-28 | 2022-04-01 | 武汉大学 | Reinforced gravel pile supported EPS light embankment structure in soft soil area and construction method |
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| CN113668501A (en) * | 2021-07-12 | 2021-11-19 | 中国化学工程重型机械化有限公司 | CFG pile composite foundation construction method |
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Application publication date: 20140507 |