CN113186955A - Compound side slope reinforced structure - Google Patents
Compound side slope reinforced structure Download PDFInfo
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- CN113186955A CN113186955A CN202110594055.XA CN202110594055A CN113186955A CN 113186955 A CN113186955 A CN 113186955A CN 202110594055 A CN202110594055 A CN 202110594055A CN 113186955 A CN113186955 A CN 113186955A
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- ditch
- supporting
- infiltration
- slope
- anchor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention provides a composite slope reinforcement structure, which comprises support infiltration ditches which are arranged along the slope of a slope in the longitudinal direction at intervals, wherein the support infiltration ditches are enclosed by the following structures: the concrete water flow surface is arranged below the upper ditch surface in a step shape, a rear inverted filter layer is connected between two adjacent layers of concrete water flow surfaces, and side inverted filter layers are connected with the upper ditch surface and arranged on two sides of the concrete water flow surface; the supporting infiltration ditch is characterized in that dry rubbles are filled in the hollow structure of the supporting infiltration ditch, a plurality of anchor cable hole steel pipes are pre-embedded in the supporting infiltration ditch from the upper ditch surface to the inside, anchor cables are installed in the anchor cable hole steel pipes, and the end parts of the anchor cables are fixed through anchor piers arranged on the upper ditch surface; and a blind ditch communicated with the supporting infiltration ditch is arranged at the bottom of the supporting infiltration ditch and is perpendicular to the supporting infiltration ditch and transversely arranged. The method effectively solves the problem of treatment of the landslide of the water-rich weak soil under special topographic and geological conditions, has low construction risk and has popularization and application values.
Description
Technical Field
The invention relates to geotechnical slope engineering, in particular to a slope reinforcement structure of a composite type prestressed anchor cable, a support infiltration ditch and a blind ditch.
Background
With the increase of excavation projects of various foundation earth and stone sides, some project landslide disasters are inevitably induced in the construction process, and the schemes of clearing the sides, arranging anti-slide piles on the front edges and the like are generally adopted for treatment. Aiming at the engineering landslide caused by a weak layer with the characteristics of low shear strength, large water content, large thickness and the like in the earth and rock excavation process, the conventional treatment scheme has the following difficulties: (1) under specific terrain conditions, such as a steep hill at the trailing edge of a landslide, the clearing conditions can be limited; (2) the clearance can generate a new weak layer free surface, so that the sliding surface is reshaped to form a new landslide; (3) under specific geological conditions, if the buried depth of an anchoring stratum is large, the cantilever section of the slide-resistant pile is overlong and even has no anchoring condition; (4) the supporting structure adopted by conventional landslide control cannot meet the winter drainage requirement of water-rich soft soil layers, and freeze thawing and frost heaving hazards exist in slope engineering in severe cold regions; (5) when the manual hole digging of the slide-resistant pile passes through the range of the soft layer, the problems of large water seepage amount, easy hole collapse and the like exist, and the construction risk is high.
Disclosure of Invention
Aiming at the problem that the conventional landslide control scheme is limited under the special working conditions, the invention provides the slope reinforcement structure of the composite prestressed anchor cable, the supporting infiltration trench and the blind trench, which effectively solves the landslide control problem under special terrain and geological conditions, has low construction risk and has popularization and application values.
The composite slope reinforcing structure comprises supporting seepage ditches which are arranged along the slope in a longitudinal direction at intervals, wherein the supporting seepage ditches are enclosed by the following structures: the concrete water flow surface is arranged below the upper ditch surface in a step shape, a rear inverted filter layer is connected between two adjacent layers of concrete water flow surfaces, and side inverted filter layers are connected with the upper ditch surface and arranged on two sides of the concrete water flow surface; the supporting infiltration ditch is characterized in that dry rubbles are filled in the hollow structure of the supporting infiltration ditch, a plurality of anchor cable hole steel pipes are pre-embedded in the supporting infiltration ditch from the upper ditch surface to the inside, anchor cables are installed in the anchor cable hole steel pipes, and the end parts of the anchor cables are fixed through anchor piers arranged on the upper ditch surface; and a blind ditch communicated with the supporting infiltration ditch is arranged at the bottom of the supporting infiltration ditch and is perpendicular to the supporting infiltration ditch and transversely arranged.
The center of the upper ditch surface of the supporting infiltration ditch is a reinforced concrete frame which is obliquely and longitudinally arranged along the side slope, the reinforced concrete frame extends from the top of the slope to the bottom of the slope, and at least the middle slope sections at two sides of the reinforced concrete frame are provided with concrete surfaces.
The side inverted filter layer of the supporting infiltration ditch sequentially comprises a sand-sandwiched gravel layer, a sand gravel layer and a permeable geotextile layer from inside to outside.
Wherein, the inverted filter layer of the supporting infiltration ditch is communicated with a drain pipe which is obliquely inserted.
Wherein, the concrete flowing water surface of the support infiltration ditch which is arranged in a ladder shape has a gradient of more than 3 percent.
Wherein the anchor cable penetrates through the supporting infiltration ditch and penetrates into the interior of a slope soil layer, and the included angle a between the anchor cable and the horizontal direction is 20-60 degrees.
The anchor cables are arranged at intervals along the supporting seepage ditches, and the anchor piers are simultaneously positioned at the intersection of the side slope cross beam and the longitudinal beam.
Wherein the depth of the supporting seepage ditch and the blind ditch is not less than 0.5m lower than the maximum freezing depth of the side slope; the blind ditch bottom is equipped with the infiltration pipe, and the blind ditch is inside to be filled with the rubble to adopt the geotechnological cloth parcel that permeates water.
The construction steps of the composite slope reinforcement structure are as follows:
s1: excavating blind ditches and supporting seepage ditches;
s2: constructing a blind ditch foundation and a concrete flowing surface for supporting a seepage ditch;
s3: constructing a side reverse filtering layer and a rear reverse filtering layer at the periphery of the supporting infiltration ditch;
s4: constructing blind ditches and supporting seepage ditches, and embedding anchor cable hole steel pipes;
s5: and constructing the anchor cable and supporting the upper groove surface of the infiltration trench to finish the prestress application of the anchor cable.
Wherein the content of the first and second substances,
between the steps S1 and S2, a construction step of arranging a drain pipe according to requirements is further included;
step S4 is executed as a blind ditch and inside a supporting infiltration ditch, and specifically comprises the following steps: constructing a blind ditch seepage pipe, constructing a dry-masonry rubble support seepage ditch, and constructing broken stones to fill the blind ditch;
the step S5 specifically includes: drilling an anchor cable; installing an anchor cable; grouting the anchor cable hole, and performing high-pressure fracturing grouting and secondary grouting if the stratum is weak; constructing an upper ditch surface of the supporting infiltration ditch and constructing an anchor pier on the upper ditch surface; and (5) applying prestress to the anchor cable and then sealing the anchor.
Compared with the prior art, the structure of the invention can effectively treat the landslide of the water-rich weak soil: (1) the water is the main cause of engineering landslide, and the supporting infiltration ditches are arranged on the side slopes of the weak layers, and the inner supporting type drain pipes are arranged on the back surfaces of the supporting infiltration ditches towards the rear edges of the landslides, so that the deep drainage problem of the weak layers and the sliding surfaces is solved, and the shear strength of soil bodies of the weak layers and the sliding surfaces is ensured; (2) the tail end of the bottom of the supporting infiltration ditch is connected with the blind ditch at the slope toe of the side slope, the tail end of the blind ditch can adopt heat preservation outlet measures according to needs, and meanwhile, the depth of the supporting infiltration ditch and the blind ditch is ensured to be not less than 0.5m lower than the maximum freezing depth, so that the requirement of drainage of a weak layer in winter is met; (3) aiming at the problem of poor anchoring stratum, the compound prestressed anchor cable can exert the anchoring force of the anchoring section to the maximum extent to reinforce the landslide, and the stratum of the anchoring section is improved through high-pressure fracturing grouting when necessary; (4) the supporting seepage ditch provides counter-force support for the prestressed anchor cable, and the problem that the anchor cable cannot apply prestress due to slope soft and weak is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic plan view of one embodiment of the slope structure of the present invention;
FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1;
FIG. 3 is a sectional view of FIG. 1 taken in the direction II-II;
fig. 4 is a sectional view in the direction III-III of fig. 2.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings. Technical terms used in the following description have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs.
As shown in fig. 1-3, the composite slope reinforcement structure of the present invention includes supporting infiltration ditches arranged along the slope in the longitudinal direction and at intervals, wherein the supporting infiltration ditches are enclosed by the following structures: the concrete water flow surface treatment device comprises an upper ditch surface 8, concrete water flow surfaces 2, a rear inverted filter layer 3 and side inverted filter layers 10, wherein the upper ditch surface 8 is arranged along a slope in a longitudinal direction, the concrete water flow surfaces 2 are arranged below the upper ditch surface 8 in a step-shaped mode, the rear inverted filter layers 3 are connected between two adjacent layers of concrete water flow surfaces 2, and the two sides of the concrete water flow surfaces 2 are connected with the upper ditch surface 8; the supporting infiltration ditch is characterized in that dry rubbles 5 are filled in the hollow structure of the supporting infiltration ditch, a plurality of anchor cable hole steel pipes 6 are pre-embedded in the supporting infiltration ditch from an upper ditch surface 8, anchor cables 7 are installed in the anchor cable hole steel pipes 6, and the end parts of the anchor cables 7 are fixed through anchor piers 9 arranged on the upper ditch surface 8; and a blind ditch 4 communicated with the supporting infiltration ditch is arranged at the bottom of the supporting infiltration ditch, and the blind ditch 4 is perpendicular to the supporting infiltration ditch and transversely arranged.
The composite slope reinforcing structure combines the design of the prestressed anchor cables, the supporting infiltration ditches and the blind ditches, can utilize the supporting infiltration ditches to solve deep drainage of a sliding surface and winter drainage, simultaneously provides counter-force support for the prestressed anchor cables, solves the problem of poor anchoring conditions of a weak stratum by utilizing the composite anchor cables, collects and converges drainage of the supporting infiltration ditches, and ensures drainage requirements.
The center of the upper ditch surface 8 of the supporting infiltration ditch is a reinforced concrete frame 81 (namely a vertical beam 13) which is obliquely and longitudinally arranged along a side slope, the reinforced concrete frame 81 extends from the top of the slope to the bottom of the slope, at least the middle slope sections at two sides of the reinforced concrete frame 81 are provided with concrete surfaces 82, and thick slurry chippings 11 can be used for replacing the concrete surfaces 82 at the slope sections at two sides of the reinforced concrete frame 81, which are close to the top of the slope and the bottom of the slope. The reinforced concrete frame 81 can improve the strength of the slope protection structure, and provides sufficient prestress counter-force support for the anchor cable 7 on the basis that the supporting seepage ditch is not enlarged.
The side inverted filter layer 10 of the supporting infiltration ditch is sequentially provided with a sand-sandwiched gravel layer 101, a sand gravel layer 102 and a permeable geotextile layer 103 from inside to outside, so that water can rapidly permeate into the supporting infiltration ditch.
And the inverted filter layer 3 of the supporting infiltration ditch is communicated with an obliquely inserted drain pipe 1 for collecting water in soil in a slope into the supporting infiltration ditch to be quickly discharged.
The concrete flowing water surface 2 of the support infiltration ditch in the ladder-shaped arrangement has a gradient of more than 3%, so that construction is facilitated, and collected water is discharged into the next layer of concrete flowing water surface.
Wherein the anchor cable 7 penetrates through the supporting infiltration ditch and penetrates into the interior of a slope soil layer, and the included angle a between the anchor cable 7 and the horizontal direction can be 20-60 degrees.
Wherein, the anchor cables 7 are arranged at intervals along the supporting infiltration ditch, and the anchor piers 9 are positioned at the intersection of the vertical beams 13 and the cross beams 14 on the side slope.
The depth of the supporting seepage ditch and the blind ditch 4 is not less than 0.5m lower than the maximum freezing depth of the side slope, so that the freezing and drainage requirements are met; the bottom of the blind ditch 4 is provided with a water seepage pipe, and the inside of the blind ditch 4 is filled with gravels and wrapped by water-permeable geotextile.
The construction steps of the composite slope reinforcement structure are as follows:
(1) excavating a blind ditch 4 and a supporting infiltration ditch;
(2) arranging a drain pipe 1 as required;
(3) constructing a blind ditch 4 foundation and a concrete flowing surface 2 for supporting an infiltration ditch;
(4) constructing a supporting infiltration ditch peripheral side inverted filter layer 10 and a rear inverted filter layer 3;
(5) constructing a blind ditch seepage pipe;
(6) applying dry rubbles 5 to support the infiltration ditch, applying broken stones to fill the blind ditch 4, and embedding anchor cable hole steel pipes 6 in advance;
(7) drilling an anchor cable;
(8) installing an anchor cable 7;
(9) grouting the anchor cable hole, and performing high-pressure fracturing grouting and secondary grouting if the stratum is weak;
(10) constructing an upper ditch surface 8 of the supporting infiltration ditch and constructing an anchor pier 9 on the upper ditch surface 8;
(11) and applying prestress to the anchor cable 7 and then sealing the anchor.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a compound side slope reinforced structure, includes along the slope support infiltration ditch vertical and interval setting, support the infiltration ditch and enclose by following structure and close and form: the concrete water flow surface is characterized by comprising an upper ditch surface (8) which is obliquely and longitudinally arranged along a side slope, concrete water flow surfaces (2) which are arranged below the upper ditch surface (8) in a step shape, a rear reverse filter layer (3) which is connected and arranged between two adjacent layers of concrete water flow surfaces (2), and side reverse filter layers (10) which are connected and arranged at two sides of the concrete water flow surfaces (2) and the upper ditch surface (8); the supporting infiltration ditch is characterized in that dry rubbles (5) are filled in the hollow structure of the supporting infiltration ditch, a plurality of anchor cable hole steel pipes (6) are embedded inwards from the upper ditch surface (8) on the supporting infiltration ditch, anchor cables (7) are installed in the anchor cable hole steel pipes (6), and the end parts of the anchor cables (7) are fixed through anchor piers (9) arranged on the upper ditch surface (8); the bottom of the supporting infiltration ditch is provided with a blind ditch (4) communicated with the supporting infiltration ditch, and the blind ditch (4) is perpendicular to the supporting infiltration ditch and transversely arranged.
2. A composite slope reinforcement structure according to claim 1, characterized in that the center of the upper trench surface (8) supporting the infiltration trench is a reinforced concrete frame (81) which is obliquely and longitudinally arranged along the slope, the reinforced concrete frame (81) extends from the top of the slope to the bottom of the slope, and at least on the middle slope sections at both sides of the reinforced concrete frame (81) is a concrete surface (82).
3. A composite slope reinforcement structure according to claim 1, characterized in that the infiltration ditch-supporting side inverted filter (10) is, from inside to outside, a sand-gravel layer (101), a sand-gravel layer (102) and a water-permeable geotextile layer (103) in this order.
4. A composite slope reinforcement structure according to claim 1, characterized in that the inverted filter layer (3) supporting the infiltration ditches is communicated with an obliquely inserted drainage pipe (1).
5. Composite slope reinforcement according to claim 1, characterized in that the concrete flow surface (2) of the support infiltration canals, which is arranged in a ladder-like manner, has a gradient of more than 3%.
6. A composite slope reinforcement structure according to claim 1, characterized in that the anchor cables (7) penetrate through the supporting infiltration ditches and penetrate into the soil layer of the slope body, and the included angle a between the anchor cables (7) and the horizontal direction is 20-60 °.
7. A composite slope reinforcement structure according to claim 1, characterized in that the anchor cables (7) are spaced along the supporting infiltration canals, and the anchor piers (9) are located at the intersection of the slope beams (14) and the longitudinal beams (13).
8. A composite slope reinforcement structure according to claim 1, characterized in that the depth of the supporting infiltration ditches and blind ditches (4) is not less than 0.5m below the maximum freezing depth of the slope; the bottom of the blind ditch (4) is provided with a water seepage pipe, and the inside of the blind ditch (4) is filled with gravels and wrapped by water-permeable geotextile.
9. The construction method of the composite type slope reinforcement structure of claim 1, comprising the steps of:
s1: excavating a blind ditch (4) and a supporting seepage ditch;
s2: constructing a foundation of the blind ditch (4) and a concrete flowing surface (2) for supporting the infiltration ditch;
s3: constructing a supporting infiltration ditch peripheral side inverted filter layer (10) and a rear inverted filter layer (3);
s4: constructing blind ditches (4) and supporting seepage ditches, and embedding anchor cable hole steel pipes (6);
s5: constructing an anchor cable (7) and supporting the upper ditch surface (8) of the infiltration ditch to finish the prestress application of the anchor cable (7).
10. The construction method of a composite type slope reinforcement structure according to claim 9,
between the steps S1 and S2, a construction step of arranging a drain pipe (1) according to requirements is further included;
step S4 is executed as a blind ditch (4) and inside a supporting seepage ditch, and specifically comprises the following steps: applying a blind ditch seepage pipe, applying dry masonry stone (5) to support a seepage ditch, and applying broken stone to fill the blind ditch (4);
the step S5 specifically includes: drilling an anchor cable; installing an anchor cable (7); grouting the anchor cable hole, and performing high-pressure fracturing grouting and secondary grouting if the stratum is weak; constructing and supporting an upper ditch surface (8) of the infiltration ditch and constructing an anchor pier (9) on the upper ditch surface (8); and applying prestress to the anchor cable (7) and then sealing the anchor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594055.XA CN113186955A (en) | 2021-05-28 | 2021-05-28 | Compound side slope reinforced structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594055.XA CN113186955A (en) | 2021-05-28 | 2021-05-28 | Compound side slope reinforced structure |
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| Publication Number | Publication Date |
|---|---|
| CN113186955A true CN113186955A (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110594055.XA Pending CN113186955A (en) | 2021-05-28 | 2021-05-28 | Compound side slope reinforced structure |
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| CN (1) | CN113186955A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134978A (en) * | 2021-11-15 | 2022-03-04 | 中铁第四勘察设计院集团有限公司 | Construction method of pervious concrete supporting infiltration ditch |
| CN114775647A (en) * | 2022-04-11 | 2022-07-22 | 广西交通设计集团有限公司 | Supporting structure and construction method of expansive soil excavation side slope |
-
2021
- 2021-05-28 CN CN202110594055.XA patent/CN113186955A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134978A (en) * | 2021-11-15 | 2022-03-04 | 中铁第四勘察设计院集团有限公司 | Construction method of pervious concrete supporting infiltration ditch |
| CN114775647A (en) * | 2022-04-11 | 2022-07-22 | 广西交通设计集团有限公司 | Supporting structure and construction method of expansive soil excavation side slope |
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