Multi-interlayer side slope combining bed rock transformation and slope body modification and construction method of multi-interlayer side slope

Abstract

The invention relates to the technical field of geotechnical engineering and geological disaster prevention and control, and particularly discloses a multi-interlayer side slope combining bedrock transformation and slope body modification and a construction method of the multi-interlayer side slope combining bedrock transformation and slope body modification. The slope-bedrock integral collaborative stability capability is obviously improved; in the layered filling process, a cemented soil-rock interlayer body is embedded, a continuous and multi-stage interlayer structure is formed, the structural integrity is enhanced, and the localization problem of a traditional supporting structure is solved; the embedded cementation layer gravel drainage grooves are formed between the cementation soil-rock interlayer body and the conventional soil-rock mixture, so that the multi-channel graded drainage and anti-leakage functions in the slope body are achieved, and the pore pressure is effectively reduced; through cooperation of a conventional drainage facility and a drainage structure in the slope body, a four-in-one composite drainage system integrating upper cutting, surface guiding, lower drainage and buffering is formed, and the anti-sliding performance and the seepage control capacity of the slope body are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering and geological disaster prevention and control, and in particular to a multi-layer slope combining bedrock reconstruction and slope modification and a construction method thereof. Background Art

[0002] During infrastructure construction and backfilling in mountainous areas, soil-rock mixture slopes are common, and their stability control has always been a core concern in fields such as geological engineering and safety engineering. Current mainstream slope support methods include retaining walls, anchor frames, slope spraying, and reinforced soil structures. These support structures often suffer from high structural rigidity, weak deformation adaptability, and limited reinforcement. They are unable to meet the slope stability requirements under high fill, large deformation, and complex geological conditions. This is particularly true in conditions with high fill heights, weak strata, and complex bedrock-slope interfaces, making them highly susceptible to engineering hazards such as landslides, leakage, and structural failure.

[0003] On the other hand, grouting reinforcement technology has been widely used in recent years for slope seepage control and structural reinforcement. It relies on the infiltration and consolidation of grouting fluid to form a continuum, and has a certain ability to modify the formation. However, grouting reinforcement suffers from issues such as uncontrollable distribution, unpredictable reinforcement range, and uneven structural strength. Especially in heterogeneous soil-rock mixtures or rock masses with developed fractures, the grouting diffusion path is uncontrollable, often leading to a coexistence of "over-reinforcement" and "under-reinforcement," which seriously affects the overall stability of the slope.

[0004] Furthermore, traditional drainage systems, such as blind ditches, vertical shafts, and plastic drain panels, typically serve only as drainage channels, lack structural strength, and are unable to simultaneously support slope reinforcement. The independence of drainage and reinforcement systems complicates engineering design and separates construction processes, making it difficult to achieve integrated support and drainage synergy, reducing project efficiency and stability.

[0005] In summary, there are currently prominent problems in slope engineering, such as the limited role of support structures, unstable grouting reinforcement effects, and single drainage system functions. There is an urgent need for a slope structure that integrates structural reinforcement and multi-level drainage functions to improve the overall engineering performance and disaster prevention and control capabilities of large slopes. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-layer slope that combines bedrock reconstruction and slope modification and a construction method thereof, so as to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above-mentioned objectives, the present invention provides a construction method for a multi-layer slope that combines bedrock transformation and slope modification, comprising the following steps: leveling and roughening the bedrock surface, the bedrock including the bedrock behind the slope and the bedrock at the bottom of the slope; setting a bedrock drainage system on the bedrock at the bottom of the slope, and setting a cemented rock-embedded groove on the bedrock behind the slope; performing backfill construction on the bedrock at the bottom of the slope, the backfill construction comprising: backfilling a cemented soil-rock interlayer body on the bedrock at the bottom of the slope and compacting it so that the cemented soil-rock interlayer body is embedded in the cemented rock-embedded groove; setting an interlayer drainage system above the cemented soil-rock interlayer body; backfilling a conventional soil-rock mixture on the cemented soil-rock interlayer body and compacting it; cyclically operating the backfill construction until the designed maximum slope height is reached; after the backfill construction is completed, conventional drainage facilities are set on the top and slope surface of the slope.

[0008] Preferably, the bedrock drainage system includes a bedrock gravel drainage trough arranged on the bedrock at the bottom of the slope, the cross-section of the bedrock gravel drainage trough is rectangular or inverted trapezoidal, the width of the bedrock gravel drainage trough is 0.3m~0.4m, and the depth is 0.4m~0.6m.

[0009] Preferably, the construction method of the bedrock gravel drainage ditch includes the following steps: excavating a drainage ditch on the roughened bedrock at the bottom of the slope; laying a filter sand layer with a thickness of not less than 3 cm in the drainage ditch; backfilling the drainage ditch with hard gravel with a particle size of 20 mm to 40 mm and a compressive strength greater than 100 MPa, using uneven grading; and covering with a permeable filter plate.

[0010] Preferably, the compressive strength of the permeable filter plate is not less than 15 MPa, and the permeability coefficient of the permeable filter plate is not less than 1×10 -3 cm / s.

[0011] Preferably, the spacing between the bedrock gravel drainage troughs arranged at the bottom of the slope and close to the bedrock area behind the slope is 3m to 4m; the spacing between the bedrock gravel drainage troughs arranged in the middle area of ​​the bedrock at the bottom of the slope is 4m to 6m; the spacing between the bedrock gravel drainage troughs arranged at the bottom of the slope and close to the slope surface is 6m to 8m.

[0012] Preferably, the width of the cemented rock-embedded groove is half of the thickness of the corresponding cemented soil-rock interlayer body, and the depth of the cemented rock-embedded groove is 0.4m to 0.6m.

[0013] Preferably, the thickness ratio of the cemented soil-rock interlayer to the conventional soil-rock mixture below is 1:4 to 1:6, the thickness of the cemented soil-rock interlayer decreases from bottom to top, and the minimum thickness of the cemented soil-rock interlayer is not less than 0.3m to 0.4m.

[0014] Preferably, the compaction coefficients of the cemented soil-rock interlayer and the conventional soil-rock mixture are both not less than 0.93, and the thickness of the conventional soil-rock mixture after compaction is not greater than one tenth of the total height of the slope.

[0015] Preferably, the interlayer drainage system includes a cemented layer gravel drainage trough arranged on the cemented soil-rock interlayer body, the width of the cemented layer gravel drainage trough is 0.3 to 0.4 m, and the depth is 1 / 3 of the thickness of the cemented soil-rock interlayer body; the construction method of the cemented layer gravel drainage trough is the same as the construction method of the bedrock gravel drainage trough.

[0016] A multi-layer slope that combines bedrock reconstruction and slope modification is formed using the above-mentioned construction method, comprising a slope body, wherein the slope body comprises a cemented soil-rock sandwich body and a conventional soil-rock mixture alternately arranged from bottom to top; a cemented rock-embedded groove is opened on the bedrock behind the slope, and the cemented rock-embedded groove is used to embed the cemented soil-rock sandwich body; the slope top and slope surface of the slope body are provided with conventional drainage facilities, and the conventional drainage facilities include a slope top intercepting ditch, a slope surface water diversion ditch and a slope foot water collection ditch; a cemented layer gravel drainage ditch is provided on the top of the cemented soil-rock sandwich body, and the cemented layer gravel drainage ditch on different cemented soil-rock sandwich bodies is staggered; a plurality of bedrock gravel drainage ditches are opened on the bedrock at the bottom of the slope, and the tops of the bedrock gravel drainage ditch and the cemented layer gravel drainage ditch are both covered with permeable filter plates.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects.

[0018] 1. The present invention strengthens the bonding force between the slope and the bedrock by constructing a cemented rock-embedded groove at the bedrock-slope interface, forming an anti-slip "structural pile" effect, controlling the bedrock seepage channel, and significantly improving the overall coordinated stability of the slope and bedrock; during the layered filling process, a cemented soil-rock interlayer is embedded to form a continuous, multi-level interlayer structure, thereby enhancing the structural integrity and overcoming the localization problem of traditional support structures.

[0019] 2. The present invention achieves multi-channel graded drainage and anti-leakage functions in the slope by arranging embedded cemented layer gravel drainage troughs between the cemented soil-rock interlayer and the conventional soil-rock mixture, effectively reducing the pore pressure; through the coordination of conventional drainage facilities and the drainage structure inside the slope, a four-in-one composite drainage system of "upper interception, surface guidance, lower drainage, and buffering" is formed, which comprehensively improves the anti-slip performance and seepage control ability of the slope.

[0020] 3. The multi-layer slope and its construction method for combined bedrock transformation and slope modification provided by the present invention overcome the defects of existing slope reinforcement methods such as insufficient rigidity, passive drainage, and poor coordination, and realize multi-dimensional integration of reinforcement structure, deep coordination of drainage function, and overall improvement of engineering performance, providing an efficient, safe and reliable new structural solution for large-scale complex slopes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a side cross-sectional view of a multi-layer slope that combines bedrock reconstruction and slope modification according to the present invention.

[0023] Figure 2 This is a front cross-sectional view of a multi-layer slope that combines bedrock reconstruction and slope modification according to the present invention.

[0024] Figure 3 It is a schematic diagram of the assembly of the water permeable filter plate of the present invention.

[0025] In the figure: 1. Cemented rock-embedded trough; 2. Conventional soil-rock mixture; 3. Cemented layer gravel drainage trough; 4. Cemented soil-rock interlayer; 5. Bedrock; 6. Bedrock gravel drainage trough; 7. Construction joint; 8. Permeable filter plate. DETAILED DESCRIPTION

[0026] It should be noted that, unless there is a conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other. The embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] like Figures 1 to 3 As shown, the present invention provides a construction method for a multi-layer slope that combines bedrock transformation and slope modification, comprising the following steps: leveling and roughening the surface of the bedrock 5, wherein the roughening process uses a mechanical roughening method to form a rough interface on the surface of the bedrock 5 to enhance the interface friction between the bedrock 5 and the overlying soil and rock mixture, thereby improving the anti-slip stability of the entire slope. The bedrock 5 includes the bedrock behind the slope and the bedrock at the bottom of the slope; a bedrock drainage system is set on the bedrock at the bottom of the slope, and a rubber drainage system is set on the bedrock behind the slope. The rock-embedded groove 1 is formed; backfill construction is carried out on the bedrock at the bottom of the slope, and the backfill construction includes: backfilling a cemented soil-rock interlayer body 4 on the bedrock at the bottom of the slope and compacting it so that the cemented soil-rock interlayer body 4 is embedded in the cemented rock-embedded groove 1; setting an interlayer drainage system above the cemented soil-rock interlayer body 4; backfilling a conventional soil-rock mixture 2 on the cemented soil-rock interlayer body 4 and compacting it; cyclically operating the backfill construction until the designed maximum slope height is reached; after the backfill construction is completed, setting conventional drainage facilities on the top and slope surface of the slope.

[0028] According to a further optimization scheme, the bedrock drainage system includes a bedrock gravel drainage trough 6 arranged on the bedrock at the bottom of the slope. The cross-section of the bedrock gravel drainage trough 6 is rectangular or inverted trapezoidal. The width of the bedrock gravel drainage trough 6 is 0.3m~0.4m, and the depth is 0.4m~0.6m.

[0029] To further optimize the solution, the construction method of the bedrock gravel drainage ditch 6 includes the following steps: excavating a drainage ditch on the roughened bedrock at the bottom of the slope; laying a filter sand layer with a thickness of not less than 3 cm in the drainage ditch; backfilling the drainage ditch with hard gravel with a particle size of 20 mm to 40 mm and a compressive strength greater than 100 MPa, such as granite gravel or basalt gravel, using uneven grading; and covering with a permeable filter plate 8.

[0030] Further optimization scheme, the compressive strength of the permeable filter plate 8 is not less than 15MPa, and the permeability coefficient of the permeable filter plate 8 is not less than 1×10 -3 cm / s.

[0031] To further optimize the plan, in order to achieve enhanced drainage and seepage pressure control at the bottom of the slope, the layout of the bedrock gravel drainage troughs 6 follows the principle of "dense outside and sparse inside", that is: the bedrock gravel drainage troughs 6 arranged in the bedrock at the bottom of the slope close to the bedrock behind the slope are spaced at intervals of 3m to 4m; the bedrock gravel drainage troughs 6 arranged in the middle area of ​​the bedrock at the bottom of the slope are spaced at intervals of 4m to 6m; the bedrock gravel drainage troughs 6 arranged in the area of ​​the bedrock at the bottom of the slope close to the slope surface are spaced at intervals of 6m to 8m.

[0032] According to a further optimization scheme, the width of the cemented rock-embedded groove 1 is half of the thickness of the corresponding cemented soil-rock interlayer 4 , and the depth of the cemented rock-embedded groove 1 is 0.4 m to 0.6 m.

[0033] A cemented rock-embedded groove 1 is opened in the bedrock behind the slope. The position of the cemented rock-embedded groove 1 is consistent with the horizontal position of the cemented soil-rock interlayer 4 to be constructed. The cemented soil-rock interlayer 4 is poured into the cemented rock-embedded groove 1 and then horizontally backfilled into the corresponding interlayer range to form an integrated embedded structure of "interlayer-bedrock 5", thereby improving the bonding strength between the slope and the bedrock 5 and preventing the development of seepage channels along the back interface of the slope.

[0034] To further optimize the plan, in order to ensure the shear resistance and water-cutting effect of the sandwich structure, the thickness ratio of the cemented soil-rock interlayer 4 to the conventional soil-rock mixture 2 below is 1:4 to 1:6, the thickness of the cemented soil-rock interlayer 4 becomes thinner from bottom to top, and the minimum thickness of the cemented soil-rock interlayer 4 is not less than 0.3m to 0.4m.

[0035] To further optimize the solution, the surface of the cemented soil-rock interlayer 4 is roughened after being compacted.

[0036] To further optimize the solution, in order to prevent irregular cracks caused by uneven force due to the large volume of the cemented soil-rock interlayer 4, a construction joint 7 is provided on the cemented soil-rock interlayer 4. The width of the construction joint 7 is 20 mm, and the spacing is 4 to 6 m. The construction joint 7 is roughened and sealed with cement slurry or other binders. The seam line is arranged from the top of the slope to the foot of the slope, and the two adjacent layers of cemented soil-rock interlayer 4 must not be vertically aligned to avoid the penetration of seepage channels.

[0037] According to the further optimization scheme, the compaction coefficients of the cemented soil-rock interlayer 4 and the conventional soil-rock mixture 2 are both not less than 0.93, and the thickness of the conventional soil-rock mixture 2 after compaction is not greater than one tenth of the total height of the slope, and generally does not exceed 3m to 5m.

[0038] To further optimize the solution, the interlayer drainage system includes a cemented layer gravel drainage trough 3 arranged on the cemented soil-rock interlayer body 4. The width of the cemented layer gravel drainage trough 3 is 0.3~0.4 m, and the depth is 1 / 3 of the thickness of the cemented soil-rock interlayer body 4; the construction method of the cemented layer gravel drainage trough 3 is the same as the construction method of the bedrock gravel drainage trough 6.

[0039] The layout spacing of the cemented layer gravel drainage trough 3 is the same as the construction joint 7 of this layer, and is aligned with the construction joint 7 on the upper cemented soil-rock interlayer 4, so that the seepage water can be discharged along the construction joint 7, avoiding the formation of isolated water accumulation areas, and improving the overall drainage efficiency and interlayer stability.

[0040] A multi-layer slope that combines bedrock reconstruction and slope modification is formed using the above-mentioned construction method, including a slope body, which includes a cemented soil-rock sandwich body 4 and a conventional soil-rock mixture 2 arranged alternately from bottom to top; a cemented rock-embedded trough 1 is opened on the bedrock behind the slope, and the cemented rock-embedded trough 1 is used to embed the cemented soil-rock sandwich body 4; the slope top and slope surface are provided with conventional drainage facilities, and the conventional drainage facilities include a slope top intercepting ditch, a slope surface water diversion trough and a slope foot water collection ditch; a cemented layer gravel drainage trough 3 is provided on the top of the cemented soil-rock sandwich body 4, and the cemented layer gravel drainage troughs 3 on different cemented soil-rock sandwich bodies 4 are arranged in an alternating manner; a plurality of bedrock gravel drainage troughs 6 are opened on the bedrock at the bottom of the slope, and the tops of the bedrock gravel drainage troughs 6 and the cemented layer gravel drainage troughs 3 are both covered with permeable filter plates 8.

[0041] The multi-layered slope provided by the present invention combines bedrock reconstruction and slope modification, and strengthens the bonding force between the slope and the bedrock 5 by constructing a cemented rock-embedded groove 1 at the bedrock 5-slope interface, thereby forming an anti-slip "structural pile" effect, controlling the seepage channel of the bedrock 5, and significantly improving the overall coordinated stability of the slope and bedrock 5; in the layered filling process, a cemented soil-rock interlayer body 4 is embedded to form a continuous, multi-level interlayer structure, thereby enhancing the structural integrity and overcoming the localization problem of traditional support structures.

[0042] By arranging an embedded cemented layer gravel drainage trough 3 between the cemented soil-rock interlayer 4 and the conventional soil-rock mixture 2, multi-channel graded drainage and anti-leakage functions are realized in the slope, effectively reducing the pore pressure; by coordinating conventional drainage facilities with the drainage structure inside the slope, a four-in-one composite drainage system of "upper interception, surface guidance, lower drainage, and buffering" is formed, which comprehensively improves the slope's anti-slip performance and seepage control ability.

[0043] The multi-layer slope and construction method for combined bedrock transformation and slope modification provided by the present invention overcome the defects of existing slope reinforcement methods such as insufficient rigidity, passive drainage, and poor coordination, and achieve multi-dimensional integration of reinforcement structure, deep coordination of drainage function, and overall improvement of engineering performance, providing an efficient, safe, and reliable new structural solution for large-scale complex slopes.

[0044] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A construction method for a multi-layer slope combining bedrock reconstruction and slope modification, characterized in that: The following steps are involved: The surface of the bedrock (5) is leveled and roughened, and the bedrock (5) includes the bedrock behind the slope and the bedrock at the bottom of the slope; A bedrock drainage system is set up on the bedrock at the bottom of the slope, and a cemented rock-embedded groove is set up on the bedrock behind the slope (1); Backfill construction is carried out on the bedrock at the bottom of the slope. The backfill construction includes: Backfilling the cemented soil-rock interlayer (4) on the bedrock at the bottom of the slope and compacting it so that the cemented soil-rock interlayer (4) is embedded in the cemented rock-embedded groove (1); setting an interlayer drainage system above the cemented soil-rock interlayer (4); backfilling the conventional soil-rock mixture (2) on the cemented soil-rock interlayer (4) and compacting it; Repeat the backfill construction until the designed maximum slope height is reached; After the backfill construction is completed, conventional drainage facilities are set up on the top and slope surface of the slope.

2. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 1 is characterized in that: The bedrock drainage system comprises a bedrock gravel drainage trough (6) arranged on the bedrock at the bottom of the slope, the cross section of the bedrock gravel drainage trough (6) being rectangular or inverted trapezoidal, the width of the bedrock gravel drainage trough (6) being 0.3m to 0.4m, and the depth being 0.4m to 0.6m.

3. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 2 is characterized in that: The construction method of the bedrock gravel drainage trough (6) comprises the following steps: Dig drainage ditches on the roughened bedrock at the bottom of the slope; Lay a filter sand layer with a thickness of not less than 3cm in the drainage trough; Backfill the drainage ditch with hard gravel of particle size 20mm to 40mm and compressive strength greater than 100MPa, using uneven grading; Cover with a permeable filter plate (8).

4. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 3 is characterized in that: The compressive strength of the permeable filter plate (8) is not less than 15 MPa, and the permeability coefficient of the permeable filter plate (8) is not less than 1×10 -3 cm / s.

5. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 2 is characterized in that: The bedrock gravel drainage troughs (6) arranged at the bottom of the slope near the bedrock behind the slope are spaced at intervals of 3m to 4m; the bedrock gravel drainage troughs (6) arranged at the middle area of ​​the bedrock at the bottom of the slope are spaced at intervals of 4m to 6m; The bedrock gravel drainage troughs (6) arranged in the area of ​​the bedrock at the bottom of the slope close to the slope surface are spaced at intervals of 6m to 8m.

6. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 1 is characterized in that: The width of the cemented rock-embedded groove (1) is half the thickness of the correspondingly arranged cemented soil-rock interlayer body (4), and the depth of the cemented rock-embedded groove (1) is 0.4m to 0.6m.

7. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 6 is characterized in that: The thickness ratio of the cemented soil-rock interlayer (4) to the conventional soil-rock mixture (2) below is 1:4 to 1:6, the thickness of the cemented soil-rock interlayer (4) gradually decreases from bottom to top, and the minimum thickness of the cemented soil-rock interlayer (4) is not less than 0.3m to 0.4m.

8. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 7 is characterized in that: The compaction coefficients of the cemented soil-rock interlayer (4) and the conventional soil-rock mixture (2) are both not less than 0.93, and the thickness of the conventional soil-rock mixture (2) after compaction is not greater than one tenth of the total height of the slope.

9. The construction method of a multi-layer slope combining bedrock reconstruction and slope modification according to claim 2, characterized in that: The interlayer drainage system comprises a cemented layer gravel drainage trough (3) arranged on a cemented soil-rock interlayer body (4), wherein the width of the cemented layer gravel drainage trough (3) is 0.3 to 0.4 m, and the depth is 1 / 3 of the thickness of the cemented soil-rock interlayer body (4); the construction method of the cemented layer gravel drainage trough (3) is the same as the construction method of the bedrock gravel drainage trough (6).

10. A multi-layered slope for combined bedrock reconstruction and slope modification, formed by the construction method for a multi-layered slope for combined bedrock reconstruction and slope modification according to any one of claims 1 to 9, characterized in that: The invention comprises a slope body, wherein the slope body comprises a cemented soil-rock interlayer body (4) and a conventional soil-rock mixture body (2) arranged alternately from bottom to top; a cemented rock-embedded groove (1) is opened on the bedrock behind the slope, and the cemented rock-embedded groove (1) is used to embed the cemented soil-rock interlayer body (4); the slope top and slope surface of the slope body are provided with conventional drainage facilities, and the conventional drainage facilities include a slope top intercepting ditch, a slope surface water diversion ditch and a slope foot water collection open ditch; a cemented layer gravel drainage groove (3) is provided on the top of the cemented soil-rock interlayer body (4), and the cemented layer gravel drainage grooves (3) on different cemented soil-rock interlayer bodies (4) are arranged in an alternating manner; a plurality of bedrock gravel drainage grooves (6) are opened on the bedrock at the bottom of the slope, and the tops of the bedrock gravel drainage grooves (6) and the cemented layer gravel drainage grooves (3) are both covered with permeable filter plates (8).

Images