CN110984120B - Filling structure of shallow-buried non-pressure water-filled karst cave and construction method thereof - Google Patents
Filling structure of shallow-buried non-pressure water-filled karst cave and construction method thereof Download PDFInfo
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- CN110984120B CN110984120B CN201911420361.0A CN201911420361A CN110984120B CN 110984120 B CN110984120 B CN 110984120B CN 201911420361 A CN201911420361 A CN 201911420361A CN 110984120 B CN110984120 B CN 110984120B
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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
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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Abstract
The invention discloses a filling structure of a shallow-buried pressureless water-filled karst cave and a construction method thereof, wherein the filling structure comprises a fine-grained soil filling layer, a plurality of coarse sand filling layers and a rock block filling layer which are alternately arranged from top to bottom; a plurality of water passing pipelines are arranged in each stone filling layer at intervals from the second stone filling layer from bottom to top; the block stone filling layer and the coarse sand filling layer are internally provided with grouting pipes, the grouting pipes are introduced into the block stone filling layer and the coarse sand filling layer from top to bottom, a plurality of slurry outlets are formed in the walls of the grouting pipes, the upper ends of the grouting pipes are led out of the fine-grained soil filling layer and are connected with a slurry conveying port of grouting equipment, and vertical waterproof sections with certain thickness are formed in the block stone filling layer and the coarse sand filling layer through grouting. Compared with other construction methods, the construction method of the filling structure has the advantages of low cost, good treatment effect, high construction speed, high construction quality and no later-stage potential safety hazard; and the filling layer of the structure has good strength and stability, and is not easy to cause road collapse.
Description
Technical Field
The invention relates to the technical field of karst cave filling construction, in particular to a filling structure of a shallow-buried pressureless water-filled karst cave and a construction method thereof.
Background
When a highway, a railway or a municipal road is constructed in a karst development area, a roadbed inevitably passes through an underground shallow-buried karst cave area, and in order to ensure the stability of the road, the underground shallow-buried karst cave is treated or filled to construct a road structure on the underground shallow-buried karst cave. If the treatment effect is not good, the subgrade and pavement collapse after the road operation is caused, and huge economic loss, casualties and adverse social effects can be brought. For treatment of shallow-buried non-pressure water-filled karst caves, particularly when water in the karst caves is in a flowing state, the existing construction method mainly adopts the step of passing through a bridge, but the bridge construction cost is high, underground construction is inconvenient, and the construction period is long; if the construction method of filling first and then grouting is adopted, the construction difficulty is high, the construction cost is high, the treatment effect is difficult to guarantee, and because underground water cannot circulate after complete filling, the quality hidden danger is often generated in the later period. Therefore, no effective method exists for treating the shallow-buried pressureless water-filled cavern, and a simple and effective construction method needs to be provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a filling structure of a shallow-buried pressureless water-filled cavern and a construction method thereof.
The technical scheme for realizing the aim of the invention is as follows:
a filling structure of a shallow-buried pressureless water-filled karst cave is characterized in that the water depth in the karst cave is less than 5m, and the water flow speed is less than 0.5 m/s; the filling structure comprises fine-grained soil filling layers, a plurality of coarse sand filling layers and block stone filling layers which are alternately arranged from top to bottom; a plurality of water passing pipelines are arranged in each stone filling layer at intervals from the second stone filling layer from bottom to top; grouting pipes are further arranged in the rock block filling layer and the coarse sand filling layer, the grouting pipes are introduced into the rock block filling layer and the coarse sand filling layer from top to bottom, a plurality of slurry outlets are formed in the walls of the grouting pipes, the upper ends of the grouting pipes are led out of the fine-grained soil filling layer and are connected with a slurry conveying port of grouting equipment, and vertical waterproof sections with certain thickness are formed in the rock block filling layer and the coarse sand filling layer through grouting.
And the interval between adjacent water passing pipelines in each stone filling layer of the water passing pipelines is 50-100 cm.
And the outer diameter of the water passing pipeline is equal to the thickness of the block stone filling layer.
The thickness of the rock block filling layer is 50-100 cm.
The thickness of the coarse sand filling layer is 30-50 cm.
The grouting pipes comprise a plurality of grouting sub-pipes which are uniformly arranged in the block stone filling layer and the coarse sand filling layer at intervals.
A construction method of a filling structure of a shallow-buried pressureless water-filled karst cave comprises the following steps:
1) determining the filling range of the karst cave, filling block stones at the bottom of the karst cave to enable the surfaces of the block stones to be flat and form a certain gradient, wherein the gradient is less than 10 degrees, finishing the filling of a first layer of block stone filling layer, namely a substrate layer, and simultaneously uniformly arranging a plurality of grouting sub-pipes at intervals on the block stone filling layer;
2) paving a coarse sand filling layer above the first layer of block stone filling layer by coarse sand, ensuring that the upper surface of the coarse sand filling layer is smooth and forms the same gradient as the lower layer of block stone filling layer, and simultaneously guiding a grouting sub-pipe upwards in the coarse sand filling layer;
3) paving water passing pipelines on the upper surface of the coarse sand filling layer at intervals of 50-100cm, and filling gaps among the water passing pipelines with block stones, so that the height of the filled block stones is flush with the top of the water passing pipelines;
4) repeating the step 2) and the step 3) until the water passing pipeline is exposed out of the water surface, filling gaps among the water passing pipeline with the block stones to enable the height of the filled block stones to be flush with the top of the water passing pipeline, and laying a last coarse sand filling layer;
5) converging and connecting a plurality of grouting sub-pipes, connecting the grouting pipes with a slurry conveying port of grouting equipment outside the karst cave, and pouring slurry into the rock block filling layer and the coarse sand filling layer to fill gaps in the rock block filling layer and the coarse sand filling layer with the slurry so as to form water-proof sections with the thickness of 30-50cm and 50-100 cm;
6) and filling fine soil in an anhydrous area in the karst cave, and performing layered rolling compaction to form a fine soil filling layer until the whole karst cave area is filled.
The stone blocks can be replaced by stone chips; the coarse sand can be replaced by pebbles; the fine soil is sand or clay.
The water passing pipeline is a high-density polyethylene pipe with the compressive strength of more than 10 MPa.
The invention provides a filling structure of a shallow-buried pressureless water-filled karst cave and a construction method thereof, and the filling structure has the following advantages:
1. compared with other construction methods, the construction method of the filling structure has the advantages of low cost, good treatment effect, high construction speed, high construction quality and no later-stage potential safety hazard;
2. the normal flow of underground water in the karst cave can be ensured by burying the water passing pipeline;
3. the filling is carried out by adopting the rock block and the coarse sand, so that the filling layer can be ensured to have enough strength and stability;
4. the grouting cross section can prevent underground water flow from scouring the rock block and coarse sand filling layer, and the loosening and sinking of the filling layer are avoided, so that the strength and stability of the filling layer are ensured.
Drawings
FIG. 1 is a schematic cross-sectional view of a filling structure of a shallow non-pressure water-filled cavern in an embodiment;
FIG. 2 is a schematic longitudinal sectional view of a filling structure of a shallow non-pressure water-filled cavern in an embodiment;
in the figure: 1. the system comprises a cave 2, a rock block filling layer 3, a water passing pipeline 4, a coarse sand filling layer 5, a fine soil filling layer 6, an in-situ groundwater level line 7, a filled groundwater level line 8, a grouting pipe 9, a grouting sub-pipe 10 and a water-resisting section.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited thereto.
Example (b):
as shown in fig. 1 and 2:
a filling structure of a shallow-buried pressureless water-filled karst cave is characterized in that the water depth in the karst cave 1 is less than 5m, and the water flow speed is less than 0.5 m/s; the filling structure comprises a fine-grained soil filling layer 5 above a water level line, and a plurality of coarse sand filling layers 4 and block stone filling layers 2 which are alternately arranged below the water level line; from the second layer of block stone filling layer 2 from bottom to top, a plurality of water passing pipelines 3 are arranged in each layer of block stone filling layer 2 at intervals; still set up slip casting pipe 8 in stone fill layer 2 and coarse sand fill layer 4, slip casting pipe 8 is from last to introducing in a plurality of layers of stone fill layer 2 and coarse sand fill layer 4 down, is equipped with a plurality of thick liquids exports on the 8 walls of slip casting pipe, and the upper end of slip casting pipe 8 is drawn forth fine grained soil fill layer 5 and is connected with the defeated thick liquid mouth of slip casting equipment outward, forms the vertical water-proof section 10 that has certain thickness in stone fill layer and coarse sand fill layer through the slip casting.
And the interval between adjacent water passing pipes 3 in each rock filling layer 2 of the water passing pipes 3 is 50-100 cm.
And the outer diameter of the water passing pipeline 3 is equal to the thickness of the rock filling layer 2.
The thickness of the block stone filling layer 2 is 50-100 cm.
The thickness of the coarse sand filling layer 4 is 30-50 cm.
The grouting pipe 8 comprises a plurality of grouting sub-pipes 9 which are uniformly arranged in the block stone filling layer and the coarse sand filling layer at intervals.
A construction method of a filling structure of a shallow-buried pressureless water-filled karst cave comprises the following steps:
1) determining the filling range of the karst cave, filling the bottom of the karst cave 1 with rock blocks, firstly throwing and filling large rock blocks, replacing the rock blocks with high-strength rock without weathering or flaky rock, then throwing and filling small rock blocks among the large rock blocks, reducing gaps among the rock blocks, improving the strength and stability of a filling layer, simultaneously flattening the surfaces of the rock blocks and forming a certain gradient, wherein the gradient is less than 10 degrees, completing the filling of a first rock block filling layer 2, namely a substrate layer, and simultaneously uniformly arranging a plurality of grouting sub pipes 9 at the rock block filling layer 2 at intervals;
2) paving a coarse sand filling layer 4 above the first rock block filling layer 2 by coarse sand, wherein the coarse sand can be replaced by coarse broken stones with the particle size of 2-4cm or pebbles with the particle size of 2-10cm, so as to ensure that the upper surface of the coarse sand filling layer 4 is smooth and forms the same gradient as that of the lower rock block filling layer 2, meanwhile, a grouting sub-pipe 9 is upwards led in the coarse sand filling layer 4, the grouting sub-pipe 9 is a high-strength steel pipe so as to prevent the deformation caused by the collision of rocks, and the grouting pipes are uniformly arranged on the central section, and the water surface is exposed above the grouting sub-pipe;
3) water passing pipes 3 are laid on the upper surface of the coarse sand filling layer 4 at intervals of 50-100cm, the water passing pipes 3 are laid on the coarse sand, and the bottoms of the pipes are closely attached to the surface of the coarse sand layer to provide stable support for the pipes; the water passing pipeline 3 is made of high-density polyethylene pipes with the compressive strength of more than 10MPa, has certain toughness to overcome the topography with high and fluctuant bottoms in the karst cave, so that the strength and the stability of the karst cave can be kept unchanged in a groundwater environment for a long time, and the gaps between the water passing pipelines are filled with the block stones, so that the height of the filled block stones is flush with the top of the water passing pipeline;
4) repeating the step 2) and the step 3) until the water passing pipeline is exposed out of the water surface, filling gaps among the water passing pipeline with the block stones to enable the height of the filled block stones to be flush with the top of the water passing pipeline, and laying a last coarse sand filling layer 4;
5) a plurality of grouting sub-pipes 9 are connected in a converging manner, then a grouting pipe 8 is connected with a grout conveying port of grouting equipment outside a karst cave 1, grout is poured into a block stone filling layer 2 and a coarse sand filling layer 4, so that the grout fills gaps in the block stone filling layer 2 and the coarse sand filling layer 4 to form a waterproof section 10 with the thickness of 50-100cm, underground water is guaranteed to flow only in a water passing pipeline, scouring of the block stone and the coarse sand filling layer by the water flow is prevented, meanwhile, the grout contains certain quick-setting agent, sufficient fluidity, compactness and water stability are guaranteed, the grout can be quickly solidified underwater, after the block stone filling layer 2, the water passing pipeline 3 and the coarse sand filling layer 4 are arranged in the karst cave 1, an in-situ water level 6 is raised to a filled underground water level 7, and water only flows in the water passing pipeline 3;
6) and filling fine soil in an anhydrous area in the karst cave, and performing layered rolling compaction to form a fine soil filling layer until the whole karst cave area is filled.
Claims (7)
1. A filling structure of a shallow-buried pressureless water-filled karst cave is characterized in that the water depth in the karst cave is less than 5m, and the water flow speed is less than 0.5 m/s; the filling structure comprises fine-grained soil filling layers, a plurality of coarse sand filling layers and block stone filling layers which are alternately arranged from top to bottom; a plurality of water passing pipelines are arranged in each stone filling layer at intervals from the second stone filling layer from bottom to top; grouting pipes are further arranged in the rock block filling layer and the coarse sand filling layer, the grouting pipes are introduced into the rock block filling layer and the coarse sand filling layer from top to bottom, a plurality of slurry outlets are formed in the walls of the grouting pipes, the upper ends of the grouting pipes are led out of the fine-grained soil filling layer and are connected with a slurry conveying port of grouting equipment, and vertical waterproof sections with certain thickness are formed in the rock block filling layer and the coarse sand filling layer through grouting;
the grouting pipes comprise a plurality of grouting sub-pipes which are uniformly arranged in the block stone filling layer and the coarse sand filling layer at intervals; the construction method of the filling structure comprises the following steps:
1) determining the filling range of the karst cave, filling block stones at the bottom of the karst cave to enable the surfaces of the block stones to be flat and form a certain gradient, wherein the gradient is less than 10 degrees, finishing the filling of a first layer of block stone filling layer, namely a substrate layer, and simultaneously uniformly arranging a plurality of grouting sub-pipes at intervals on the block stone filling layer;
2) paving a coarse sand filling layer above the first layer of block stone filling layer by coarse sand, ensuring that the upper surface of the coarse sand filling layer is smooth and forms the same gradient as the lower layer of block stone filling layer, and simultaneously guiding a grouting sub-pipe upwards in the coarse sand filling layer;
3) paving water passing pipelines on the upper surface of the coarse sand filling layer at intervals of 50-100cm, and filling gaps among the water passing pipelines with block stones, so that the height of the filled block stones is flush with the top of the water passing pipelines;
4) repeating the step 2) and the step 3) until the water passing pipeline is exposed out of the water surface, filling gaps among the water passing pipeline with the block stones to enable the height of the filled block stones to be flush with the top of the water passing pipeline, and laying a last coarse sand filling layer;
5) converging and connecting a plurality of grouting sub-pipes, connecting the grouting pipes with a slurry conveying port of grouting equipment outside the karst cave, and pouring slurry into the rock block filling layer and the coarse sand filling layer to fill gaps in the rock block filling layer and the coarse sand filling layer with the slurry so as to form a waterproof section with the thickness of 50-100 cm;
6) and filling fine soil in an anhydrous area in the karst cave, and performing layered rolling compaction to form a fine soil filling layer until the whole karst cave area is filled.
2. The filling structure of a shallow-buried pressureless water-filled cavern according to claim 1, wherein the adjacent water passing pipes in each stone filling layer are spaced 50-100cm apart.
3. The filling structure of a shallow-buried pressureless water-filled cavern according to claim 1, wherein the outer diameter of the water passing pipeline is equal to the thickness of a rock block filling layer.
4. The filling structure of a shallow-buried pressureless water-filled cavern according to claim 1, wherein the thickness of the rock block filling layer is 50-100 cm.
5. The filling structure of a shallow-buried pressureless water-filled cavern according to claim 1, wherein the thickness of the coarse sand filling layer is 30-50 cm.
6. The filling structure of a shallow-buried pressureless water-filled cavern as recited in claim 1, wherein the fine soil is sand or clay.
7. The filling structure of a shallow-buried pressureless water-filled cavern according to claim 1, wherein the water passing pipeline is made of high-density polyethylene pipe with compressive strength of more than 10 MPa.
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| CN201911420361.0A CN110984120B (en) | 2019-12-31 | 2019-12-31 | Filling structure of shallow-buried non-pressure water-filled karst cave and construction method thereof |
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| CN201911420361.0A CN110984120B (en) | 2019-12-31 | 2019-12-31 | Filling structure of shallow-buried non-pressure water-filled karst cave and construction method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046558A (en) * | 2012-12-27 | 2013-04-17 | 湖南省交通规划勘察设计院 | Shallow-buried karst cave filing construction method and shallow-buried karst cave filing construction structure |
| CN105672248A (en) * | 2016-03-21 | 2016-06-15 | 中交一公局第一工程有限公司 | Irregular shallow karst cavity ribbing and grouting filling structure and construction method |
| CN107152294A (en) * | 2017-06-28 | 2017-09-12 | 中国铁建大桥工程局集团有限公司 | High hydraulic pressure big flow Karst Tunnel underground water seal blocking method |
| CN107938650A (en) * | 2017-12-22 | 2018-04-20 | 中交第三航务工程局有限公司宁波分公司 | The method for filling and treating of underground karst cavity |
| CN109469042A (en) * | 2018-12-10 | 2019-03-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of antiseepage stockyard place karst cave treatment structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7806631B2 (en) * | 2007-04-17 | 2010-10-05 | Smith Eric W | Underground filling and sealing method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046558A (en) * | 2012-12-27 | 2013-04-17 | 湖南省交通规划勘察设计院 | Shallow-buried karst cave filing construction method and shallow-buried karst cave filing construction structure |
| CN105672248A (en) * | 2016-03-21 | 2016-06-15 | 中交一公局第一工程有限公司 | Irregular shallow karst cavity ribbing and grouting filling structure and construction method |
| CN107152294A (en) * | 2017-06-28 | 2017-09-12 | 中国铁建大桥工程局集团有限公司 | High hydraulic pressure big flow Karst Tunnel underground water seal blocking method |
| CN107938650A (en) * | 2017-12-22 | 2018-04-20 | 中交第三航务工程局有限公司宁波分公司 | The method for filling and treating of underground karst cavity |
| CN109469042A (en) * | 2018-12-10 | 2019-03-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of antiseepage stockyard place karst cave treatment structure |
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