A multi-layered slope combining bedrock modification and slope body modification and a construction method thereof
By constructing cemented rock-embedded grooves at the bedrock-slope interface and embedding cemented soil-rock interlayers, combined with a multi-level drainage system, the problems of insufficient rigidity of the slope support structure and independent drainage system were solved, achieving efficient and safe improvement of the overall stability of the slope.
Patent Information
- Application Number
- CN202511188191.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2045-08-25
AI Technical Summary
The existing slope support structure is not rigid enough, the grouting reinforcement effect is unstable, and the drainage system has a single function, making it difficult to achieve integrated coordination of support and drainage functions, resulting in complex engineering design and insufficient stability.
A cemented rock-embedded groove is constructed at the bedrock-slope interface, and a cemented soil-rock interlayer is embedded therein. Drainage channels are laid out within the interlayer, and combined with conventional drainage facilities, a multi-level drainage system is formed to enhance the structural integrity and anti-sliding performance.
It significantly improved the overall stability and anti-sliding performance of the slope, realized the multi-dimensional integration of the reinforcement structure and the deep synergy of the drainage function, and enhanced the engineering performance.
Smart Images
Figure CN120700906B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of geotechnical engineering and geological disaster prevention technology, and in particular to a multi-layered slope combining bedrock modification and slope alteration and its construction method. Background Technology
[0002] In the construction of infrastructure and engineering embankments in mountainous areas, soil-rock mixed slopes are widespread, and their stability control has always been a core issue of concern in geological engineering, safety engineering, and other fields. Currently, the mainstream slope support methods mainly include retaining walls, anchor frames, shotcrete and anchor systems, and reinforced soil structures. These support structures often suffer from high structural rigidity, weak adaptability to deformation, and localized reinforcement range, failing to meet the stability requirements of slopes under conditions of high fill, large deformation, and complex geological conditions. Especially in situations with large fill heights, weak strata, and complex bedrock-slope interfaces, they are highly susceptible to engineering disasters such as landslides, seepage, and structural failure.
[0003] On the other hand, grouting reinforcement technology has been widely used in slope seepage control and structural reinforcement in recent years. It relies on grout penetration and consolidation to form a continuous body and has a certain ability to modify the strata. However, the grouting reinforcement effect has problems such as uncontrollable distribution, unpredictable reinforcement range, and uneven structural strength. Especially in heterogeneous soil-rock mixtures or rock masses with developed fractures, the grout diffusion path is uncontrollable, and the phenomenon of "over-reinforcement" and "under-reinforcement" often coexist, which seriously affects the overall stability of the slope.
[0004] Furthermore, traditional drainage systems such as blind drains, vertical shafts, and plastic drainage boards typically only serve a drainage function, have low structural strength, and cannot simultaneously undertake slope reinforcement tasks. The independent operation of drainage and reinforcement systems leads to complex engineering design, separate construction procedures, and difficulty in achieving integrated coordination of support and drainage functions, thus reducing project efficiency and stability.
[0005] In summary, current slope engineering suffers from prominent problems such as limited support structure function, unstable grouting reinforcement effect, and single-function drainage system. There is an urgent need for a slope structure that integrates structural reinforcement and multi-stage drainage functions to improve the overall engineering performance and disaster prevention capabilities of large slopes. Summary of the Invention
[0006] The purpose of this invention is to provide a multi-layered slope combining bedrock modification and slope alteration, and its construction method, in order to solve the problems existing in the prior art.
[0007] To achieve the above objectives, this invention provides a construction method for a multi-layered slope combining bedrock modification and slope alteration, comprising the following steps: leveling and roughening the bedrock surface, the bedrock including back slope bedrock and bottom slope bedrock; setting up a bedrock drainage system on the bottom slope bedrock and setting up cemented rock-embedded grooves on the back slope bedrock; backfilling construction on the bottom slope bedrock, the backfilling construction including: backfilling and compacting a cemented soil-rock interlayer on the bottom slope bedrock, so that the cemented soil-rock interlayer is embedded in the cemented rock-embedded grooves; setting up an interlayer drainage system above the cemented soil-rock interlayer; backfilling and compacting a conventional soil-rock mixture on the cemented soil-rock interlayer; cyclically performing backfilling construction until the maximum designed slope height is reached; after the backfilling construction is completed, setting up conventional drainage facilities at the top and surface of the slope.
[0008] Preferably, the bedrock drainage system includes a bedrock gravel drainage ditch disposed on the bedrock at the bottom of the slope. The bedrock gravel drainage ditch has a rectangular or inverted trapezoidal cross-section, and the width of the bedrock gravel drainage ditch is 0.3m to 0.4m, and the depth is 0.4m to 0.6m.
[0009] Preferably, the construction method of the bedrock crushed stone 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 3cm in the drainage ditch; backfilling the drainage ditch with hard crushed stone with a particle size of 20mm to 40mm and a compressive strength greater than 100MPa, using uneven gradation; and covering it with a permeable filter board.
[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 × 10⁻⁶. -3 cm / s.
[0011] Preferably, the spacing between the bedrock drainage channels located in the area of the bedrock at the bottom of the slope near the back of the slope is 3m to 4m; the spacing between the bedrock drainage channels located in the middle area of the bedrock at the bottom of the slope is 4m to 6m; and the spacing between the bedrock drainage channels located in the area of the bedrock at the bottom of the slope near the slope surface is 6m to 8m.
[0012] Preferably, the width of the cemented rock-embedded groove is half the thickness of the corresponding cemented soil-rock interlayer, 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 underlying conventional soil-rock mixture is 1:4 to 1:6, the thickness of the cemented soil-rock interlayer gradually 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 both the cemented soil-rock interlayer and the conventional soil-rock mixture are not less than 0.93, and the compacted thickness of the conventional soil-rock mixture is not greater than one-tenth of the total height of the slope.
[0015] Preferably, the interlayer drainage system includes a cemented gravel drainage channel disposed on the cemented soil-rock interlayer, wherein the width of the cemented gravel drainage channel is 0.3 to 0.4 m and the depth is 1 / 3 of the thickness of the cemented soil-rock interlayer; the construction method of the cemented gravel drainage channel is the same as the construction method of the bedrock gravel drainage channel.
[0016] A multi-layered slope combining bedrock modification and slope alteration, formed using the aforementioned construction method, includes a slope body comprising cemented soil-rock interlayers and conventional soil-rock mixtures arranged alternately from bottom to top. Cemented rock-embedded grooves are formed in the bedrock behind the slope to embed the cemented soil-rock interlayers. Conventional drainage facilities are provided at the top and surface of the slope body, including a top intercepting ditch, a surface water diversion channel, and a toe drainage ditch. Cemented gravel drainage channels are provided on the top of the cemented soil-rock interlayers, with these channels interleaved across different interlayers. Multiple bedrock gravel drainage channels are formed in the bedrock at the bottom of the slope, and the tops of both the bedrock gravel drainage channels and the cemented gravel drainage channels are covered with permeable filter plates.
[0017] Compared with the prior art, the present invention has the following advantages and technical effects.
[0018] 1. This invention strengthens the bond between the slope and the bedrock by constructing cemented rock-embedded grooves at the bedrock-slope interface, forming an anti-sliding "structural pile" effect, controlling the bedrock seepage channels, and significantly improving the overall coordinated stability of the slope and bedrock. During the layered filling process, cemented soil-rock interlayers are embedded to form a continuous, multi-level interlayer structure, enhancing the overall structure and overcoming the localization problem of traditional support structures.
[0019] 2. This invention achieves multi-channel graded drainage and seepage prevention functions within the slope by embedding cemented soil-rock interlayers and conventional soil-rock mixtures into cemented layer crushed stone drainage channels, effectively reducing pore pressure. Through the synergy of conventional drainage facilities and the drainage structure inside the slope, a composite drainage system integrating "upper interception, surface guidance, lower drainage, and buffering" is formed, comprehensively improving the slope's anti-sliding performance and seepage control capabilities.
[0020] 3. The multi-layered slope and its construction method that combine bedrock modification and slope body modification provided by this invention overcome the defects of existing slope reinforcement methods such as insufficient rigidity, passive drainage, and poor coordination. It realizes multi-dimensional integration of reinforcement structure, deep coordination of drainage function, and overall improvement of engineering performance, providing a new type of efficient, safe and reliable structural solution for large-scale complex slopes. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a side view cross-section of a multi-layered slope combining bedrock modification and slope alteration according to the present invention.
[0023] Figure 2 This is a frontal cross-sectional view of a multi-layered slope combining bedrock modification and slope alteration according to the present invention.
[0024] Figure 3 This is a schematic diagram of the assembly of the permeable filter plate of the present invention.
[0025] In the diagram: 1. Cemented rock-embedded channel; 2. Conventional soil-rock mixture; 3. Cemented layer gravel drainage channel; 4. Cemented soil-rock interlayer; 5. Bedrock; 6. Bedrock gravel drainage channel; 7. Construction joint; 8. Permeable filter plate. Detailed Implementation
[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] like Figures 1 to 3 As shown, this invention provides a construction method for a multi-layered slope combining bedrock modification and slope alteration, comprising the following steps: leveling and roughening the surface of bedrock 5 using mechanical roughening to create a rough interface on the surface of bedrock 5, thereby enhancing the interfacial friction between bedrock 5 and the overlying soil-rock mixture and improving the overall slope's anti-sliding stability; bedrock 5 includes back slope bedrock and bottom slope bedrock; a bedrock drainage system is installed on the bottom slope bedrock, and an adhesive layer is installed on the back slope bedrock. The process involves: backfilling the bedrock at the bottom of the slope with cemented soil-rock interlayer 4 and compacting it, so that the cemented soil-rock interlayer 4 is embedded in the cemented rock-rock interlayer 1; installing an interlayer drainage system above the cemented soil-rock interlayer 4; backfilling the cemented soil-rock interlayer 4 with conventional soil-rock mixture 2 and compacting it; cyclically performing the backfilling operation until the maximum designed slope height is reached; and after the backfilling is completed, installing conventional drainage facilities at the top and surface of the slope.
[0028] Further optimization of the scheme: the bedrock drainage system includes a bedrock gravel drainage ditch 6 set on the bedrock at the bottom of the slope. The cross-section of the bedrock gravel drainage ditch 6 is rectangular or inverted trapezoidal. The width of the bedrock gravel drainage ditch 6 is 0.3m to 0.4m and the depth is 0.4m to 0.6m.
[0029] Further optimization of the scheme: The construction method of the bedrock crushed stone drainage channel 6 includes the following steps: excavating a drainage channel on the roughened bedrock at the bottom of the slope; laying a filter sand layer with a thickness of not less than 3cm in the drainage channel; backfilling the drainage channel with hard crushed stone with a particle size of 20mm to 40mm and a compressive strength greater than 100MPa, such as granite crushed stone or basalt crushed stone, using uneven gradation; and covering with permeable filter board 8.
[0030] Further optimization of the design: 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 × 10⁻⁶. -3 cm / s.
[0031] To further optimize the scheme and achieve enhanced drainage and seepage pressure control at the bottom of the slope, the layout of the bedrock gravel drainage channels 6 follows the principle of "dense on the outside and sparse on the inside". Specifically, the bedrock gravel drainage channels 6 arranged in the area of the bedrock at the bottom of the slope close to the bedrock behind the slope are spaced 3m to 4m apart; the bedrock gravel drainage channels 6 arranged in the middle area of the bedrock at the bottom of the slope are spaced 4m to 6m apart; and the bedrock gravel drainage channels 6 arranged in the area of the bedrock at the bottom of the slope close to the slope surface are spaced 6m to 8m apart.
[0032] Further optimization of the scheme: the width of the cemented rock-embedded trench 1 is half the thickness of the corresponding cemented soil-rock interlayer 4, and the depth of the cemented rock-embedded trench 1 is 0.4m to 0.6m.
[0033] A cemented rock-embedded trench 1 is constructed in the bedrock area behind the slope. The position of the cemented rock-embedded trench 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 trench 1 and backfilled horizontally to the corresponding interlayer range to form an integrated "interlayer-bedrock 5" embedded structure, which improves the bonding strength between the slope and the bedrock 5 and prevents the seepage channel from developing along the slope back interface.
[0034] To further optimize the scheme and ensure the shear resistance and water cutoff effect of the interlayer 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 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.
[0035] To further optimize the scheme, the surface of the cemented soil-rock interlayer 4 was roughened after compaction.
[0036] To further optimize the scheme, in order to prevent irregular cracks caused by uneven stress due to the excessive volume of the cemented soil-rock interlayer 4, construction joints 7 are set on the cemented soil-rock interlayer 4. The width of the construction joints 7 is 20mm and the spacing is 4m to 6m. The construction joints 7 are roughened and sealed with cement grout or other binders. The direction of the joint line is from the top of the slope to the bottom of the slope, and the two adjacent cemented soil-rock interlayers 4 must not be vertically aligned to avoid the seepage channel from being connected.
[0037] Further optimization of the scheme: the compaction coefficients of cemented soil-rock interlayer 4 and conventional soil-rock mixture 2 are both not less than 0.93, and the thickness of conventional soil-rock mixture 2 after compaction is not greater than one-tenth of the total height of the slope, generally not exceeding 3m to 5m.
[0038] Further optimization of the scheme: the interlayer drainage system includes a cemented layer crushed stone drainage channel 3 installed on the cemented soil-rock interlayer 4. The width of the cemented layer crushed stone drainage channel 3 is 0.3 to 0.4 m, and the depth is 1 / 3 of the thickness of the cemented soil-rock interlayer 4. The construction method of the cemented layer crushed stone drainage channel 3 is the same as the construction method of the bedrock crushed stone drainage channel 6.
[0039] The spacing of the cemented layer crushed stone drainage channel 3 is the same as that of the construction joint 7 in this layer, and it is aligned with the construction joint 7 on the upper cemented soil-rock interlayer 4, so that the infiltrated water can be discharged in a concentrated manner 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-layered slope combining bedrock modification and slope alteration, formed using the aforementioned construction method, includes a slope body comprising cemented soil-rock interlayers 4 and conventional soil-rock mixtures 2 arranged alternately from bottom to top; cemented rock-embedded grooves 1 are carved into the bedrock behind the slope to embed the cemented soil-rock interlayers 4; conventional drainage facilities are provided at the top and surface of the slope body, including a top intercepting ditch, a surface water diversion channel, and a toe drainage ditch; a cemented gravel drainage channel 3 is provided on the top of the cemented soil-rock interlayers 4, with the cemented gravel drainage channels 3 on different cemented soil-rock interlayers 4 arranged alternately; multiple bedrock gravel drainage channels 6 are carved into the bedrock at the bottom of the slope, and the tops of the bedrock gravel drainage channels 6 and the cemented gravel drainage channels 3 are covered with permeable filter plates 8.
[0041] The multi-layered slope combining bedrock modification and slope alteration provided by this invention strengthens the bond between the slope and bedrock by constructing a cemented rock-embedded groove 1 at the interface between bedrock 5 and slope, forming an anti-sliding "structural pile" effect, controlling the seepage channels of bedrock 5, and significantly improving the overall coordinated stability of the slope and bedrock 5. During the layered filling process, a cemented soil-rock interlayer 4 is embedded to form a continuous, multi-level interlayered structure, enhancing the overall structure and overcoming the localization problem of traditional support structures.
[0042] By installing embedded cemented layer crushed stone drainage channels 3 between cemented soil-rock interlayer 4 and conventional soil-rock mixture 2, multi-channel graded drainage and seepage prevention functions are realized in the slope, effectively reducing pore pressure. Through the synergy of conventional drainage facilities and drainage structures inside the slope, a composite drainage system integrating "upper interception, surface guidance, lower drainage, and buffering" is formed, comprehensively improving the slope's anti-sliding performance and seepage control capabilities.
[0043] The multi-layered slope and its construction method that combine bedrock modification and slope alteration provided by this invention overcome the shortcomings of existing slope reinforcement methods, such as insufficient rigidity, passive drainage, and poor coordination. It realizes multi-dimensional integration of reinforcement structure, deep coordination of drainage function, and overall improvement of engineering performance, providing a new type of efficient, safe, and reliable structural solution for large-scale complex slopes.
[0044] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.
Claims
1. A construction method for a multi-layered slope combining bedrock modification and slope alteration, characterized in that, Includes the following steps: The surface of the bedrock (5) is leveled and roughened. The bedrock (5) includes the bedrock behind the slope and the bedrock at the bottom of the slope. A bedrock drainage system is installed on the bedrock at the bottom of the slope, and a cemented rock-embedded trough is installed on the bedrock behind the slope (1). Backfilling work is carried out on the bedrock at the bottom of the slope. The backfilling work includes: Backfill the cemented soil-rock interlayer (4) on the bedrock at the bottom of the slope and compact it so that the cemented soil-rock interlayer (4) is embedded in the cemented rock-embedded groove (1); set up an interlayer drainage system above the cemented soil-rock interlayer (4); backfill the cemented soil-rock interlayer (4) with conventional soil-rock mixture (2) and compact it. The backfilling process is repeated until the maximum designed slope height is reached. After the backfilling is completed, conventional drainage facilities are installed at the top and surface of the slope. The bedrock drainage system includes a bedrock gravel drainage ditch (6) set on the bedrock at the bottom of the slope. The cross-section of the bedrock gravel drainage ditch (6) is rectangular or inverted trapezoidal. The width of the bedrock gravel drainage ditch (6) is 0.3m to 0.4m and the depth is 0.4m to 0.6m. The width of the cemented rock-embedded trough (1) is half the thickness of the corresponding cemented soil-rock interlayer (4), and the depth of the cemented rock-embedded trough (1) is 0.4m to 0.6m. The interlayer drainage system includes a cemented layer crushed stone drainage channel (3) installed on the cemented soil-rock interlayer (4). The width of the cemented layer crushed stone drainage channel (3) is 0.3 to 0.4 m, and the depth is 1 / 3 of the thickness of the cemented soil-rock interlayer (4). The construction method of the cemented layer crushed stone drainage channel (3) is the same as that of the bedrock crushed stone drainage channel (6). The construction method of the bedrock gravel drainage channel (6) includes the following steps: Drainage trenches were excavated on the bedrock at the bottom of the slope after it had been roughened. Lay a filter sand layer with a thickness of not less than 3cm in the drainage ditch; Hard crushed stone with a particle size of 20mm to 40mm and a compressive strength greater than 100MPa is backfilled into the drainage ditch, using uneven gradation; Cover with a permeable filter plate (8); The multi-layered slope formed by the above-mentioned construction method of combined bedrock modification and slope modification includes a slope body, which includes cemented soil-rock interlayer (4) and conventional soil-rock mixture (2) arranged alternately from bottom to top; cemented rock-embedded groove (1) is opened on the bedrock behind the slope, which is used to embed the cemented soil-rock interlayer (4); conventional drainage facilities are set on the top and surface of the slope body, which include a top intercepting ditch, a surface water diversion ditch and a bottom water collection ditch; cemented layer gravel drainage ditch (3) is set on the top of the cemented soil-rock interlayer (4), and the cemented layer gravel drainage ditch (3) on different cemented soil-rock interlayers (4) are staggered; multiple bedrock gravel drainage ditch (6) is opened on the bedrock at the bottom of the slope, and the top of the bedrock gravel drainage ditch (6) and the cemented layer gravel drainage ditch (3) are covered with permeable filter plates (8).
2. The construction method for a multi-layered slope combining bedrock modification and slope alteration according to claim 1, 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 × 10⁻⁶. -3 cm / s.
3. The construction method for a multi-layered slope combining bedrock modification and slope alteration according to claim 1, characterized in that, The bedrock gravel drainage channels (6) arranged in the area of the bedrock at the bottom of the slope near the back of the slope are spaced 3m to 4m apart; the bedrock gravel drainage channels (6) arranged in the middle area of the bedrock at the bottom of the slope are spaced 4m to 6m apart; The bedrock gravel drainage channels (6) arranged in the area of the bedrock near the slope surface at the bottom of the slope are spaced 6m to 8m apart.
4. The construction method for a multi-layered slope combining bedrock modification and slope alteration according to claim 1, 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.
5. The construction method for a multi-layered slope combining bedrock modification and slope alteration according to claim 4, 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.
Citation Information
Patent Citations
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