CN111827257A - Self-drainage solidified soil roadbed structure and construction method - Google Patents
Self-drainage solidified soil roadbed structure and construction method Download PDFInfo
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- CN111827257A CN111827257A CN202010596983.5A CN202010596983A CN111827257A CN 111827257 A CN111827257 A CN 111827257A CN 202010596983 A CN202010596983 A CN 202010596983A CN 111827257 A CN111827257 A CN 111827257A
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- drain pipe
- roadbed
- water
- gravel layer
- drainage
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
Abstract
The invention provides a self-drainage solidified soil roadbed structure and a construction method thereof, wherein the self-drainage solidified soil roadbed structure comprises a roadbed and a gravel layer laid at the bottom of the roadbed; a plurality of transversely laid drainage pipes are arranged in the crushed stone layer; the left end of the drainage pipe extends out along the left side of the gravel layer, and the right end of the drainage pipe extends out along the right side of the gravel layer; heating rods are inserted into the parts, extending out of the gravel layer, of the two ends of the water drainage pipe, and self-drainage is formed by utilizing the water loss characteristic of the water absorption material after heating; a plurality of water permeable holes are formed in the water drainage pipe; the outer part of the drain pipe is wrapped with a permeable filter membrane; a cathode steel wire grid is arranged between the roadbed and the gravel layer; and an anode steel wire grid is arranged at the upper part of the roadbed. The invention changes the capillary water direction through electroosmosis and discharges the capillary water from the pipeline, thereby solving the engineering problem that the capillary water in the roadbed soil body rises due to the existence of underground water, accumulates in the soil body and can not be discharged, thereby reducing the water stability.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a self-drainage solidified soil roadbed structure and a construction method.
Background
In the projects such as dams, embankments and the like, the filling layer is often treated by adopting measures such as replacement filling, modification, edge covering and the like, after the projects such as roads and the like are built, a road surface structure layer and a drainage system obstruct the filling of the roadbed to prevent the filling from being influenced by environmental factors such as rainfall and the like, but the water content of the soil body above the underground water level at the lower part of the roadbed still can be changed by the factors such as the environment and the like, the capillary water effect is enlarged due to the larger matrix suction of the soil body, the rising of capillary water can cause the increase of the water content in the roadbed soil, the strength is rapidly reduced, and accidents such as the cracking of the soil body, overlarge settlement. However, most of the existing projects usually adopt geogrids to change the stress-strain field of the soil body in the treatment range, so as to indirectly improve the strength of the soil body, but the method is not the basis for treatment, and the strength attenuation of the soil inside the roadbed is still unavoidable.
The water absorption of the geogrid has great engineering requirements, for example, when the construction is carried out on an expansive soil foundation, the effect of capillary water is obviously highlighted due to the great mechanical suction of the expansive soil. The capillary water rises to cause the water content in the expansive soil roadbed to change periodically, so that the dry-wet cycle effect, the expansion deformation and the like are caused, the strength is reduced rapidly, and the reason is that the expansive soil roadbed generates engineering diseases after 2-3 years.
The traditional method is to perform cushion treatment on the bottom of the roadbed or add geogrids inside the roadbed to improve the soil body strength. The existing geogrids at present have: plastic geogrids, warp-knitted geogrids, composite bidirectional geogrids, bidirectional steel-plastic geogrids, steel wire grids and the like. The design concept mainly focuses on the use of new materials, new warp and weft structures and new node design so as to realize the enhancement of the tensile property, the integrity and the durability of the geogrid. And the water absorption of the geogrid is less designed and researched, and the problem of capillary water rise caused by the suction force of the matrix in the roadbed is not designed and researched.
Disclosure of Invention
In order to solve the problems, the invention provides a self-drainage solidified soil roadbed structure and a construction method thereof, which change the capillary water direction through electroosmosis and discharge the capillary water from a pipeline, thereby solving the engineering problem that the capillary water in the soil body of the roadbed rises due to the existence of underground water, accumulates in the soil body and can not be discharged, thereby reducing the water stability.
The technical scheme is as follows: the invention provides a self-drainage solidified soil roadbed structure, which comprises a roadbed and a gravel layer laid at the bottom of the roadbed; a plurality of transversely laid drainage pipes are arranged in the crushed stone layer; the left end of the drainage pipe extends out along the left side of the gravel layer, and the right end of the drainage pipe extends out along the right side of the gravel layer; heating rods are inserted into the parts of the two ends of the drain pipe extending out of the gravel layer; a plurality of water permeable holes are formed in the water drainage pipe; the outer part of the drain pipe is wrapped with a permeable filter membrane; the interior of the drainage pipe is filled with water absorbing materials;
a cathode steel wire grid is arranged between the roadbed and the gravel layer; and an anode steel wire grid is arranged at the upper part of the roadbed.
Further, the drain pipe extends downwards from the center to two ends in an inclined mode.
Further, the ratio of the area of the water permeable holes in the middle part of the drain pipe, which is in contact with the gravel layer, to the surface area of the middle part of the drain pipe is not less than 10%; the proportion of the area of the water holes of the two end parts of the drain pipe extending out of the gravel layer to the surface area of the two end parts of the drain pipe is not less than 80%.
Further, the drain pipe is a stainless steel pipe.
Further, the heating rod, the cathode steel wire grating and the anode steel wire grating are powered by a solar power supply.
A construction method of a self-drainage solidified soil roadbed structure comprises the following steps:
s1, arranging water permeable holes on the water drainage pipe, filling water absorbing materials in the water drainage pipe, and wrapping the water permeable filter membrane 8 outside the water drainage pipe;
s2, laying a crushed stone layer, and transversely laying a plurality of drainage pipes in the crushed stone layer; the left end of the drainage pipe extends out along the left side of the gravel layer, and the right end of the drainage pipe extends out along the right side of the gravel layer; the parts of the two ends of the drain pipe extending out of the gravel layer are inserted with heating rods;
s3, laying a cathode steel wire grid on the upper part of the crushed stone layer;
and S4, paving the roadbed to a certain height, paving a layer of anode steel wire grating, and continuously paving the roadbed till the roadbed is finished.
Has the advantages that: (1) according to the invention, capillary water in the roadbed flows to the cathode through electroosmosis, and is absorbed by the water absorption material to form a drainage network; the engineering problems of strength reduction, settlement increase and the like caused by capillary water rise in the roadbed are solved.
(2) According to the characteristic that the water absorbing material loses water after being heated, two ends of the water draining pipe extend out of the roadbed, the water absorbing material at two ends of the water draining pipe is heated through a heating rod, and water in the water draining pipe is discharged forcibly; due to the water permeability of the high polymer water absorption material, water in the water absorption material in the middle of the drain pipe is absorbed to the left end and the right end of the drain pipe, and then is heated by the heating rod, and the steps are repeated in this way, so that self-drainage is completed.
(3) The solar energy power supply is adopted, so that the energy is saved, and the solar energy power supply is green and environment-friendly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a longitudinal sectional view of the drain pipe of the present invention;
FIG. 4 is a cross-sectional view of the drain pipe of the present invention;
FIG. 5 is a schematic structural view of a cathode steel wire grid according to the present invention;
fig. 6 is a schematic view showing the arrangement of the drainage pipes according to the present invention.
Detailed Description
Referring to fig. 1 and 2, the present invention provides a self-draining solidified soil roadbed structure, which comprises a roadbed 1 and a gravel layer 2 laid on the bottom of the roadbed 1.
As shown in fig. 6, a plurality of transversely laid drainage pipes 3 are arranged in the gravel layer 2; the left end of the water drainage pipe 3 extends out along the left side of the gravel layer 2, and the right end of the water drainage pipe extends out along the right side of the gravel layer 2; heating rods 4 are inserted into the parts of the two ends of the drain pipe 3 extending out of the gravel layer 2.
As shown in fig. 3 and 4, the drain pipe 3 is a stainless steel pipe, and a plurality of water permeable holes 301 are formed in the drain pipe 3; the proportion of the area of the water permeable holes 301 on the middle part of the drain pipe 3, which is in contact with the gravel layer 2, to the surface area of the middle part of the drain pipe 3 is not less than 10 percent; the proportion of the area of the water permeable holes 301 on the two end parts of the drain pipe 3 extending out of the gravel layer 2 to the surface area of the two end parts of the drain pipe 3 is not less than 80%.
A water permeable filter membrane 302 is wrapped outside the drain pipe 3; the permeable filter membrane is preferably O95Non-woven filter membranes of < 0.075 mm.
The inside of the drain pipe 3 is filled with a water absorbing material 303, preferably a high molecular water absorbing resin.
The drain pipe 3 extends downwards from the center to both ends in an inclined manner, and the inclination angle is 2 degrees in the embodiment.
A cathode steel wire grid 5 shown in figure 5 is arranged between the roadbed 1 and the gravel layer 2; and an anode steel wire grid 6 is arranged at the upper part of the roadbed 1. The cathode steel wire grating 5 and the anode steel wire grating 6 are both metal woven meshes with the transverse and longitudinal equal spacing of 10cm, and the diameter of the steel wire is 2 mm.
The heating rod 4, the cathode steel wire grating 5 and the anode steel wire grating 6 are powered by a solar power supply 7. The output voltage of the solar power supply 7 is 20V, and the maximum output power is 60W.
A construction method of a self-drainage solidified soil roadbed structure comprises the following steps:
s1, selecting a stainless steel pipe with the outer diameter of 20mm and the inner diameter of 15mm as a drain pipe 3; a water permeable hole 301 is formed in the drain pipe 3 through an electric drill, a water absorbing material 303 is filled in the drain pipe 3, and a water permeable filter membrane 302 is wrapped outside the drain pipe 3; the water permeable filter membrane 302 and the drain pipe 3 can be bonded by hot melting or chemical reagents;
s2, laying a gravel layer 2 with the thickness of 10cm, transversely laying a plurality of drain pipes 3 in the gravel layer 2, and laying the drain pipes 3 at equal intervals of 20 cm; the left end of the drain pipe 3 extends out 50cm along the left side of the gravel layer 2, and the right end extends out 50cm along the right side of the gravel layer 2; the heating rod 4 is inserted into the part of the two ends of the drain pipe 3 extending out of the gravel layer 2;
s3, laying a cathode steel wire grid 5 on the upper part of the gravel layer 2;
and S4, paving the 50cm roadbed 1, paving a layer of anode steel wire grid 6, and continuing to pave the roadbed 1 until finishing.
The working principle is as follows: due to the existence of underground water, the water content of the upper part of the roadbed 1 rises due to capillary water rising, and the water accumulation in the roadbed cannot be discharged, so that the water stability of the upper part of the embankment is influenced, and sedimentation is generated;
a solar power supply 7 is started to supply power to the heating rod 4, the cathode steel wire grating 5 and the anode steel wire grating 6;
capillary water in the roadbed 1 flows from the anode steel wire grid 6 to the cathode steel wire grid 5 through the electroosmosis effect and is gathered near the cathode steel wire grid 5; the water accumulated in the vicinity of the cathode water discharge grid 5 is absorbed by the water absorbing material 303 through the water permeable filter membrane 302 and the water permeable holes 301.
The water in the water absorbing materials 303 at the left end and the right end of the drain pipe 3 is heated by the heating rod 4 and then evaporated, and due to the water permeability of the high polymer water absorbing materials 303, the water in the water absorbing materials 303 at the middle part of the drain pipe 3 is absorbed to the left end and the right end of the drain pipe 3 and then heated by the heating rod 4, and the self-drainage is completed in a reciprocating manner.
Claims (6)
1. The utility model provides a self-drainage solidification dirt road bed structure which characterized in that: comprises a roadbed (1) and a rubble layer (2) laid at the bottom of the roadbed (1); a plurality of transversely laid drainage pipes (3) are arranged in the gravel layer (2); the left end of the drain pipe (3) extends out along the left side of the gravel layer (2), and the right end of the drain pipe extends out along the right side of the gravel layer (2); heating rods (4) are inserted into the parts of the two ends of the drain pipe (3) extending out of the gravel layer (2); a plurality of water permeable holes (301) are formed in the drain pipe (3); a water permeable filter membrane (302) is wrapped outside the drain pipe (3); the inside of the drain pipe (3) is filled with a water absorption material (303);
a cathode steel wire grating (5) is arranged between the roadbed (1) and the gravel layer (2); and an anode steel wire grid (6) is arranged on the upper part of the roadbed (1).
2. The self-draining curing soil roadbed structure of claim 1, wherein: the drain pipe (3) extends downwards from the center to two ends in an inclined manner.
3. The self-draining curing soil roadbed structure of claim 2, wherein: the area of the water permeable holes (301) in the middle part of the drain pipe (3) contacted with the gravel layer (2) accounts for not less than 10% of the surface area of the middle part of the drain pipe (3); the area of the water permeable holes (301) on the two end parts of the drain pipe (3) extending out of the gravel layer (2) accounts for not less than 80% of the surface area of the two end parts of the drain pipe (3).
4. The self-draining curing soil roadbed structure of claim 3, wherein: the drain pipe (3) is a stainless steel pipe.
5. The self-draining curing soil roadbed structure of claim 4, wherein: the heating rod (4), the cathode steel wire grating (5) and the anode steel wire grating (6) are powered by a solar power supply (7).
6. A construction method of a self-drainage solidified soil roadbed structure is characterized by comprising the following steps:
s1, arranging water permeable holes (301) in the drain pipe (3), filling water absorbing materials (303) in the drain pipe (3), and wrapping the water permeable filter membrane (302) outside the drain pipe (3);
s2, laying a crushed stone layer (2), and transversely laying a plurality of drainage pipes (3) in the crushed stone layer (2); the left end of the drain pipe (3) extends out along the left side of the gravel layer (2), and the right end of the drain pipe extends out along the right side of the gravel layer (2); the parts of the two ends of the drain pipe (3) extending out of the gravel layer (2) are inserted with the heating rods (4);
s3, laying a cathode steel wire grid (5) on the upper part of the gravel layer (2);
s4, paving the roadbed (1) to a certain height, then paving a layer of anode steel wire grating (6), and continuing paving the roadbed (1) until the end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010596983.5A CN111827257A (en) | 2020-06-28 | 2020-06-28 | Self-drainage solidified soil roadbed structure and construction method |
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| CN202010596983.5A CN111827257A (en) | 2020-06-28 | 2020-06-28 | Self-drainage solidified soil roadbed structure and construction method |
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| CN111827257A true CN111827257A (en) | 2020-10-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112533314A (en) * | 2020-12-01 | 2021-03-19 | 合肥工业大学 | Method for modifying expansive soil by microwave heating |
| CN116791410A (en) * | 2023-08-08 | 2023-09-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Geotechnical cloth rapid construction method applied to high-speed railway roadbed |
| CN117071338A (en) * | 2023-06-14 | 2023-11-17 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Novel water guide geotextile application method for high-speed railway drainage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10114937A (en) * | 1996-10-14 | 1998-05-06 | Maeda Corp | Electric infiltration dehydration method |
| CN104727296A (en) * | 2013-12-20 | 2015-06-24 | 邓立新 | Self-suction drain pipe |
| CN109577122A (en) * | 2018-12-07 | 2019-04-05 | 哈尔滨工业大学 | A kind of vertical drainage road structure based on electro-osmosis method |
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2020
- 2020-06-28 CN CN202010596983.5A patent/CN111827257A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10114937A (en) * | 1996-10-14 | 1998-05-06 | Maeda Corp | Electric infiltration dehydration method |
| CN104727296A (en) * | 2013-12-20 | 2015-06-24 | 邓立新 | Self-suction drain pipe |
| CN109577122A (en) * | 2018-12-07 | 2019-04-05 | 哈尔滨工业大学 | A kind of vertical drainage road structure based on electro-osmosis method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112533314A (en) * | 2020-12-01 | 2021-03-19 | 合肥工业大学 | Method for modifying expansive soil by microwave heating |
| CN117071338A (en) * | 2023-06-14 | 2023-11-17 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Novel water guide geotextile application method for high-speed railway drainage |
| CN117071338B (en) * | 2023-06-14 | 2024-04-19 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Novel water guide geotextile application method for high-speed railway drainage |
| CN116791410A (en) * | 2023-08-08 | 2023-09-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Geotechnical cloth rapid construction method applied to high-speed railway roadbed |
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Application publication date: 20201027 |