Anti-seepage reinforcing structure used after collapse of disintegrating soft rock slope containing weak intercalated layer

Abstract

The utility model discloses an anti-seepage reinforcing structure used after collapse of a disintegrating soft rock side slope containing a weak intercalated layer, belongs to the technical field of side slope engineering, and aims to solve the technical problems that in the prior art, disposal construction is slow, cost is high, and tight waterproof measures are not considered after collapse of the disintegrating soft rock side slope. The device comprises a plurality of anchoring holes formed in the surface of the disintegrating soft rock side slope, an impermeable layer and a hydrophobic layer which are sequentially laid on the surface of the disintegrating soft rock side slope, and a plurality of assembly type frame reinforcing units arranged on the outer side of the hydrophobic layer; the adjacent assembly type frame reinforcing units are connected through frame beam fixing transverse rods. The multiple assembly type frame reinforcing units are fixed to the disintegration soft rock slope surface through the frame beam fixing longitudinal rods. Mounting holes are formed in the assembly type frame reinforcing units, the mounting holes and the anchoring holes are concentrically arranged, and grouting anchor rods are arranged in the anchoring holes. According to the anti-seepage reinforcing structure, multi-stage waterproof measures are adopted, and the long-term stability of the disintegrating soft rock slope can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of slope engineering, in particular to an anti-seepage reinforcement structure after the collapse of a disintegrating soft rock slope containing a weak interlayer. Background Art

[0002] Disintegrating soft rock shows obvious characteristics of water disintegration, mudification, dehydration and cracking under the action of dry-wet cycles. The investigation and analysis of the instability events of deep cutting slopes of highways in disintegrating soft rock areas show that disintegrating soft rock slopes are in a state of dry-wet cycles for a long time under the action of heavy rainfall, and the joints and fissures of the slopes are very developed. With the disintegration of mudstone on the slope surface, rainwater can more easily penetrate into the slope under the action of heavy rainfall, causing the mudstone inside the slope to deteriorate. In addition, due to the unevenness of the rock mass and the complexity of the seepage path, weak interlayers are easily bred in the disintegrating soft rock slopes, resulting in reduced slope stability and even instability and failure.

[0003] When designing the support for collapsing soft rock slopes in deep highway cuttings, most people use the conventional graded excavation-anchor frame beam support method. Although this method improves the stability of the slope after excavation to a certain extent, it does not take strict waterproofing measures and does not consider the degradation of the rock mass under long-term rainfall conditions and construction disturbances, resulting in many collapsing soft rock slopes collapsing during the operation of the highway.

[0004] At present, there are many treatment measures for the collapse of disintegrating soft rock slopes, but they all have the disadvantages of slow construction, high cost, and failure to consider strict waterproofing measures. Therefore, the existing treatment measures for the collapse of disintegrating soft rock slopes urgently need to be further improved. Utility Model Content

[0005] The utility model aims to provide an anti-seepage reinforcement structure after the collapse of a disintegrating soft rock slope containing a weak interlayer, so as to solve the technical problems in the prior art of slow construction, high cost and failure to consider strict waterproofing measures for the treatment of the collapse of a disintegrating soft rock slope.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides an anti-seepage reinforcement structure for a disintegrating soft rock slope with a weak interlayer after collapse, which is used to reinforce the disintegrating soft rock slope, comprising: a plurality of anchor holes opened on the slope surface of the disintegrating soft rock slope, an anti-seepage layer and a hydrophobic layer sequentially laid on the slope surface of the disintegrating soft rock slope, and a plurality of assembled frame reinforcement units arranged outside the hydrophobic layer;

[0008] Adjacent assembled frame reinforcement units are connected by frame beam fixed cross bars; multiple assembled frame reinforcement units are fixed on the slope surface of the disintegrating soft rock slope by frame beam fixed longitudinal bars;

[0009] A mounting hole is formed on the assembled frame reinforcement unit. The mounting hole is concentrically arranged with the anchor hole. A grouting anchor rod is arranged in the anchor hole.

[0010] Optionally or preferably, the fabricated frame reinforcement unit comprises a fabricated longitudinal lattice beam and a fabricated transverse lattice beam;

[0011] The frame beam fixing longitudinal rod is in the shape of a screw as a whole, and comprises a nut end, a rod body and a tip; a gasket 2 is arranged between the nut end and the frame beam fixing cross rod.

[0012] Optionally or preferably, expansion joints are provided between adjacent assembled frame reinforcement units.

[0013] Optionally or preferably, a drainage ditch is provided at the top of the disintegrating soft rock slope.

[0014] Optionally or preferably, a retaining wall is provided at the bottom of the disintegrating soft rock slope, and a plurality of drainage holes are provided on the retaining wall; a drainage ditch is provided outside the retaining wall;

[0015] The retaining wall is a gravity retaining wall.

[0016] Optionally or preferably, the inner side of the retaining wall is filled with backfill soil;

[0017] An arch frame is arranged on the backfill soil slope surface, and a drainage channel is arranged on the arch frame.

[0018] Optionally or preferably, the expansion joint width is 5 mm.

[0019] Optionally or preferably, a fabric reinforcement layer is laid on the frame grid composed of a plurality of the assembled frame reinforcement units.

[0020] Based on the above technical solution, the utility model can at least produce the following technical effects:

[0021] (1) The anti-seepage reinforcement structure for the collapsed soft rock slope containing weak interlayers provided by the utility model adopts multi-level waterproof measures, including an anti-seepage layer, a hydrophobic layer, a water interception ditch arranged at the top of the slope, a drainage ditch arranged at the bottom of the slope, drainage holes arranged on the gravity retaining wall, and a drainage channel arranged on the arched skeleton of the backfill slope surface; through strict multi-level waterproof measures, rainfall is prevented from infiltrating the soft rock slope, thereby improving the long-term stability of the collapsed soft rock slope;

[0022] (2) The design concept of anchor cable frame beam support on the surface of the soft rock slope and only waterproofing and arch skeleton ecological slope protection on the backfill slope is more conducive to ensuring the long-term stability of the disintegrating soft rock slope than the traditional design method of supporting the backfill slope after backfilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the anti-seepage reinforcement structure after the collapse of the disintegrating soft rock slope containing a weak interlayer of the utility model;

[0024] Figure 2 yes Figure 1 AA section diagram in;

[0025] Figure 3 yes Figure 2 Schematic diagram of cross section of middle section B;

[0026] Figure 4 yes Figure 2 Schematic diagram of the longitudinal section of section B in the middle.

[0027] In the figure: 1. intercepting ditch; 2. anti-seepage layer; 3. hydrophobic layer; 4. assembled longitudinal lattice beam; 5. expansion joint; 6. frame beam fixing longitudinal rod; 7. grouting anchor rod; 8. weak interlayer; 9. disintegrating soft rock slope; 10. drainage ditch; 11. retaining wall concrete base plate; 12. retaining wall; 13. backfill soil; 14. arch frame; 15. fabric reinforcement layer; 16. assembled transverse lattice beam; 17. frame beam fixing transverse rod; 18. anchor hole; 19. gasket one; 20. nut end; 21. gasket two; 22. tip. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work belong to the scope of protection of the utility model.

[0029] Example

[0030] See also Figures 1 to 4 , an anti-seepage reinforcement mechanism for a disintegrating soft rock slope containing a weak interlayer after collapse, which is used to reinforce the disintegrating soft rock slope 9 containing a weak interlayer 8, including a plurality of anchor holes 18 opened on the disintegrating soft rock slope 9, and the plurality of anchor holes 18 are evenly opened on the slope surface; in actual work, the anchor holes 18 are constructed by wet drilling method, and the diameter thereof is 40 cm, the spacing between adjacent anchor holes 18 is 4 m, the depth is 20 m, and the angle with the horizontal plane is 45°.

[0031] In this embodiment, an anti-seepage layer 2 and a hydrophobic layer 3 are sequentially laid on the disintegrating soft rock slope 9, wherein a plurality of assembled frame reinforcement units are arranged on the outer side of the hydrophobic layer 3.

[0032] In actual work, the above-mentioned anti-seepage layer 2 and hydrophobic layer 3 are both constructed by spraying; the thickness of the anti-seepage layer 2 is 1 cm, and its material is modified hydrophilic polyurethane diluted with water with a concentration of 10%. The anti-aging agent and polyvinyl alcohol fiber are added in a ratio of 3g anti-aging agent and 3g organic fiber per 100g modified hydrophilic polyurethane solution.

[0033] The hydrophobic layer 3 has a thickness of 0.5 cm and is made of polyurea (PU) material. The PU material is stirred evenly according to a certain proportion to ensure that the mixture has a uniform texture.

[0034] In this embodiment, the prefabricated frame reinforcement unit includes a prefabricated longitudinal frame lattice beam 4 and a prefabricated transverse frame lattice beam 16; the prefabricated longitudinal frame lattice beam 4 and the prefabricated transverse frame lattice beam 16 are arranged crosswise, and a mounting hole is formed at the intersection position, and the mounting hole is concentrically arranged with the above-mentioned anchor hole 18, and a grouting anchor rod 7 is arranged in the anchor hole 18.

[0035] In this embodiment, the grouting anchor rod 7 is composed of an anchor rod and a grouting layer. First, the anchor rod is passed through the installation hole reserved at the intersection of the assembled transverse frame lattice beam 16 and the assembled longitudinal frame lattice beam 4, and then placed in the anchor hole 18 of the slope. Then, grouting is performed between the anchor rod and the anchor hole 18. The grouting material is cement mortar, which fixes the anchor rod and improves the bonding between the anchor rod and the slope, so that the anchor rod can play a better role. In addition, in this embodiment, a gasket 19 is also provided in the interlayer of the anchor rod hole.

[0036] In actual work, the assembled longitudinal lattice beams 4 and the assembled transverse lattice beams 16 are both assembled lattice plates made of lightweight and high-strength materials, and the plate factory customizes them according to the different spacings of the slope anchor holes 18; in this embodiment, the assembled longitudinal lattice beams 4 and the assembled transverse lattice beams 16 have a plate length of 3.9m, a plate width of 1.0m, and a plate thickness of 0.4m.

[0037] In this embodiment, adjacent prefabricated longitudinal lattice beams 4 or prefabricated transverse lattice beams 16 are connected by frame beam fixing cross bars 17 and fixed on the slope surface of the disintegrating soft rock slope 9 by frame beam fixing longitudinal bars 6; it should be noted that expansion joints 5 are provided between adjacent prefabricated frame reinforcement units, and specifically, the expansion joints 5 can be 5 mm.

[0038] In this embodiment, the above-mentioned frame beam fixing cross bar 17 and frame beam fixing longitudinal bar 6 are both made of lightweight and high-strength materials; the frame beam cross bar 17 is overall in a "Π" shape, and its upper part is a plate with circular holes on both sides, and a cylinder extends downward at the hole position, and a thread is arranged inside the cylinder, and the frame beam fixing longitudinal bar 6 is threadedly connected to the cylinder.

[0039] The frame beam fixing longitudinal rod 6 is in the shape of a screw as a whole, and includes a nut end 20, a rod body and a tip 22; a gasket 21 is provided between the nut end 20 and the frame beam fixing cross bar 17; in actual work, the frame beam fixing longitudinal rod 6 can be mechanically screwed into the slope surface along both sides of the frame beam fixing cross bar 17, so that the nut end 20 is tightly fitted with the top surface of the frame beam fixing cross bar 17.

[0040] In order to improve the waterproof performance of the support, in this embodiment, multi-level waterproofing measures are adopted.

[0041] Specifically, a drainage ditch 1 is arranged at the top of the disintegrating soft rock slope 9; a retaining wall 12 is arranged at the bottom of the disintegrating soft rock slope 9, and a plurality of drainage holes are arranged on the retaining wall 12; a drainage ditch 10 is arranged on the outer side of the retaining wall 12, and the inner side of the retaining wall 12 is filled with backfill soil 13, and an arch frame 14 is arranged on the slope surface of the backfill soil 13, and a drainage channel is arranged on the arch frame 14; in actual work, the retaining wall position at the foot of the slope is first excavated, and a waterproof layer is constructed on the bottom, the waterproof layer is connected to the slope waterproof layer (i.e., the anti-seepage layer 2 and the hydrophobic layer 3), and then a retaining wall concrete bottom plate 11 is poured on the waterproof layer, and the retaining wall 12 is placed on the retaining wall concrete bottom plate 11.

[0042] The above-mentioned multi-level waterproofing measures also include laying a fabric reinforcement layer 15 on the frame composed of multiple assembled frame reinforcement units.

[0043] This embodiment also provides a construction method for an anti-seepage reinforcement structure after collapse of a disintegrating soft rock slope containing a weak interlayer, comprising the following steps:

[0044] S1: Rapidly brushing the collapsed soft rock deep excavation cutting slope 9 containing weak interlayers to ensure the slope surface is flat, and setting a drainage ditch 1 at the top of the slope;

[0045] S2: Anchor holes 18 are evenly arranged on the slope surface and the wet drilling method is used for construction;

[0046] S3: spraying an anti-seepage agent on the slope surface by a spraying method (forming an anti-seepage layer 2), and then spraying a hydrophobic agent on the surface of the anti-seepage agent (forming a hydrophobic layer 3);

[0047] S4: laying assembled transverse frame lattice beams 16 on the slope, laying assembled longitudinal frame lattice beams 4 on the assembled transverse frame lattice beams 16, a 10 mm expansion joint 5 must be reserved between adjacent assembled frame lattice beams, and the adjacent assembled frame lattice beams are fixed by using frame beam fixing transverse bars 17 and frame beam fixing longitudinal bars 6;

[0048] S5: inserting the grouting anchor rod 7 into the mounting hole at the intersection of the assembled transverse lattice beam 16 and the assembled longitudinal lattice beam 4, and then inserting the grouting anchor rod 7 into the anchor hole 18 of the slope, injecting grout between the anchor rod and the anchor hole, and fixing the anchor rod;

[0049] S6: spraying the anti-seepage agent and the hydrophobic agent on the damaged positions of the slope anti-seepage layer 2 and the hydrophobic layer 3 during the construction process, and covering the frame position with a fabric reinforcement layer 15 to further improve the slope waterproofing measures;

[0050] S7: A gravity retaining wall 12 is set at the foot of the slope, a plurality of drainage holes are set on the retaining wall, and a drainage ditch 10 is set outside the retaining wall;

[0051] S8: Backfill the soil inside the retaining wall, compact the backfill soil 13 in layers, waterproof the slope of the backfill soil, and set an arch frame 14 on the slope of the backfill soil, with drainage channels reserved between the arch frames.

[0052] The construction method provided in this embodiment is convenient and fast, mainly reflected in: (1) the anti-seepage + hydrophobic double drainage layer on the original slope surface is constructed by the spraying method; (2) the assembled frame beam structure is simple and fast to construct compared with the cast-in-place lattice beam, and saves costs. The construction disturbance of the assembled frame beam structure has little impact on the slope and has little impact on the slope waterproof layer.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-seepage reinforcement structure after collapse of a disintegrating soft rock slope containing a weak interlayer, characterized in that: The method for reinforcing a disintegrating soft rock slope (9) comprises: a plurality of anchor holes (18) opened on the slope surface of the disintegrating soft rock slope (9), an anti-seepage layer (2) and a hydrophobic layer (3) sequentially laid on the slope surface of the disintegrating soft rock slope (9), and a plurality of assembled frame reinforcement units arranged outside the hydrophobic layer (3); Adjacent assembled frame reinforcement units are connected via frame beam fixing cross bars (17); a plurality of assembled frame reinforcement units are fixed on the slope surface of the disintegrating soft rock slope (9) via frame beam fixing longitudinal bars (6); A mounting hole is formed on the assembled frame reinforcement unit, the mounting hole is arranged concentrically with the anchor hole (18), and a grouting anchor rod (7) is arranged in the anchor hole (18).

2. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 1, characterized in that: The assembled frame reinforcement unit comprises an assembled longitudinal lattice beam (4) and an assembled transverse lattice beam (16); The frame beam fixing longitudinal rod (6) is in the shape of a screw as a whole, and comprises a nut end (20), a rod body and a tip (22); a gasket 2 (21) is provided between the nut end (20) and the frame beam fixing transverse rod (17).

3. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 1, characterized in that: Expansion joints (5) are provided between adjacent assembled frame reinforcement units.

4. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 1, characterized in that: A drainage ditch (1) is arranged on the top of the disintegrating soft rock slope (9).

5. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 1, characterized in that: A retaining wall (12) is provided at the bottom of the disintegrating soft rock slope (9), and a plurality of drainage holes are provided on the retaining wall (12); a drainage ditch (10) is provided outside the retaining wall (12); The retaining wall (12) is a gravity retaining wall.

6. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 5, characterized in that: The inner side of the retaining wall (12) is filled with backfill soil (13); An arch frame (14) is provided on the slope surface of the backfill soil (13), and a drainage channel is provided on the arch frame (14).

7. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 3, characterized in that: The expansion joint (5) has a width of 5 mm.

8. The anti-seepage reinforcement structure after collapse of disintegrating soft rock slope containing weak interlayer according to claim 1, characterized in that: A fabric reinforcement layer (15) is laid on the frame grid composed of a plurality of the assembled frame reinforcement units.

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