Full-strong weathered clastic rock flexible supporting structure and construction method

Abstract

The invention discloses a fully-strongly-weathered clastic rock flexible supporting structure and a construction method.The fully-strongly-weathered clastic rock flexible supporting structure comprises a supporting structure lower section, a supporting structure upper section and an ecological protection section which are sequentially arranged on a slope face from bottom to top, and the supporting structure lower section comprises a geomembrane lower layer, a dry-pressing rubble layer and a concrete layer; the supporting structure upper section comprises a geomembrane upper layer, a graded broken stone layer, a reinforced soil filler layer and a grid surface protection layer, the grid surface protection layer and a concrete layer serve as an outer side protection wall of the whole flexible supporting structure and have good structural stability and protection and anti-scouring capacity, and the graded broken stone layer and the dry pressing rubble layer are continuously arranged close to the slope face side. The flexible supporting structure has good water guiding capacity, is favorable for ensuring the stability of the shape of a side slope and reducing the influence of weathering, expansion, disintegration and the like of clastic rocks, integrally performs segmented and layered construction on the supporting structure, can adapt to complex geological forms and severe environments, and remarkably accelerates the construction efficiency of the flexible supporting structure due to up-and-down lap joint of the grid surface protecting layers.

Description

Technical Field

[0001] The present invention relates to the technical field of slope support, and more specifically, to a fully weathered clastic rock flexible support structure and a construction method. Background Art

[0002] The mountainous area in northern Guangxi (hereinafter referred to as the northern Guangxi mountainous area) has a rugged terrain. The fully and strongly weathered clastic rocks and limestones constitute the basic sedimentary structures in this area. The widely distributed Carboniferous fully and strongly weathered strata (such as C1d Carboniferous Datang Stage and C1y Carboniferous Yanguan Stage) are sandstone, mudstone, shale, etc. The rock types are affected by the Yishan-Liuzhou mountain-shaped structure, and the folds and faults are distributed in sequence. The rock mass is relatively broken, with the characteristics of large weathering thickness, strong disintegration and poor road performance. It is a typical slippery stratum in northern Guangxi. The northern Guangxi mountainous area has a subtropical monsoon climate, with the characteristics of high rainfall intensity and uneven rainfall in the rainy season, and large fluctuations in surface runoff in the karst area.

[0003] When constructing expressways in mountainous areas, one often faces a large number of excavated slopes. In slippery strata, heavy rains and huge karst water fluctuations often cause slope instability induced by construction excavation in highly weathered clastic rock strata. Slope scour caused by untimely protection, inappropriate construction quality and design schemes can lead to severe soil erosion and even develop into geological disasters, destroying existing protective structures and causing the project to be scrapped. This puts great investment pressure on the owners and also causes adverse social impacts.

[0004] Flexible reinforcement technology is a reinforcement technology that adds reinforcement materials with certain tensile properties to the soil. After reinforcement, the tensile strength of the rock layer is effectively improved, thereby improving the stability of the geotechnical structure. At present, the most flexible reinforcement materials used for slope management are geogrids. Through tensile tests, it was found that within 9 months, the tensile strength of the geogrid remained basically unchanged, but after 9 months, its strength began to gradually decrease. And for the fully weathered clastic rock slope, the interaction mechanism between the geogrid and it is unclear. Summary of the invention

[0005] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0006] Another object of the present invention is to provide a flexible support structure and construction method for fully weathered clastic rock, so as to solve the technical problems of low construction efficiency and poor long-term stability of the support structure for fully weathered clastic rock in the prior art.

[0007] In order to achieve these purposes and other advantages according to the present invention, on the one hand, the present invention provides a fully strongly weathered clastic rock flexible support structure, comprising a support structure lower section, a support structure upper section, and an ecological protection section arranged in sequence from bottom to top along the slope direction, a road surface is dug downwardly with a pit at the bottom of the slope, and a drainage structure is arranged on the side of the pit away from the slope; The lower section of the support structure extends into the pit, including a lower geomembrane layer, a dry-pressed flaked stone layer, and a concrete layer arranged in sequence from the inside to the outside. The lower geomembrane layer covers the inner wall of the pit and the corresponding slope area, the dry-pressed flaked stone layer is arranged on the outside of the lower geomembrane layer and fills the pit, and the concrete layer is poured and arranged on the outside of the dry-pressed flaked stone layer located above the pit, and the lower outer edge of the concrete layer is aligned with the upper outer edge of the pit; The upper support of the supporting structure is arranged on the lower support structure, including a geomembrane upper layer, a graded crushed stone layer, a reinforced soil filling layer, and a mesh protective layer which are arranged in sequence in a horizontal direction away from the slope surface. The geomembrane upper layer is laid on the corresponding slope surface area, the graded crushed stone layer is arranged along the slope inclination direction, the mesh protective layer and the reinforced soil filling layer are arranged in layers at the same height and form a stepped structure in a direction parallel to the slope surface, and the outer side of the mesh protective layer does not exceed the outer side of the concrete layer; The ecological protection section includes a geomembrane top layer and a grass planting layer. The geomembrane top layer covers the corresponding slope area, and the grass planting layer is arranged on the outside of the geomembrane top layer and on the top of the reinforced soil filling layer and the graded gravel layer.

[0008] Preferably, the grid protective surface layer includes support grids that are continuously arranged and connected in a horizontal direction parallel to the slope surface, and the support grids include a row of rectangular frame grids continuously arranged in the horizontal direction and improved soil filled in each rectangular frame grid. Between the upper and lower adjacent support grids, one end of the upper support grid away from the slope surface is overlapped with the top end of the lower support grid close to the slope surface.

[0009] Preferably, an inner support rod member is provided between the upper and lower adjacent support grids on the side close to the slope surface, and an outer support rod member is provided on the side away from the slope surface, the inner support rod member includes an inner vertical rod, and the outer support rod includes an outer vertical rod, the length of the inner vertical rod is greater than the length of the outer vertical rod, and the height of the support grid is respectively provided with a spherical ring at the upper and lower ends of the inner vertical rod and the upper and lower ends of the outer vertical rod corresponding to the boundary of the height range of the support grid, a circle of limiting grooves is provided in the middle part of the spherical ring along the circumferential direction, the upper and lower ends of the inner vertical rod have rod bodies exceeding the spherical rings at the corresponding ends, and the lower end of the inner vertical rod is anchored at At the top of the dry-pressed stone layer or the top of the reinforced soil filling layer on the lower side, the upper end of the inner vertical rod is anchored in the improved soil of the support grid on the upper side, and the lower end of the outer vertical rod exceeds the spherical ring at the corresponding end and is anchored in the improved soil of the support grid on the lower side. Spherical blocks are arranged at vertical intervals between a pair of spherical rings on the inner vertical rod corresponding to the mesh holes of the rectangular frame net. The rectangular frame net is provided with hanging rings at the upper and lower ends of the vertical connection boundary outward in the horizontal direction. The hanging rings are made of elastic material and are hung in the limit grooves at the corresponding positions.

[0010] Preferably, a layer of geogrid is laid in the horizontal direction between adjacent step layers of the reinforced soil filling layer, and a buckle is provided at the outer end corner of the geogrid corresponding to the spherical ring and a lock is provided corresponding to the rectangular frame net. The buckle is buckled in the limiting groove at the corresponding position, and the lock is buckled and connected with the mesh of the rectangular frame net at the corresponding position.

[0011] Preferably, oblique rods are connected to the side of the geogrid close to the slope in a direction perpendicular to the slope, the oblique rods are spaced apart in the horizontal plane, the lower ends of the oblique rods are anchored in the graded gravel layer, and the upper ends of the oblique rods are fixed in the reinforced soil filling layer on the upper side.

[0012] On the other hand, the present invention also provides a construction method of a fully strongly weathered clastic rock flexible support structure, comprising the following steps: S1. Determine the slope of the slope where the retaining wall support structure is located, design the construction area of ​​the support structure on the slope, divide the upper and lower sections of the support structure and the ecological protection section, level the slope, and construct the pits of the support structure. The width of the pits should be consistent with the thickness of the support structure, and a drainage channel should be set outside the pits; S2. Lay geomembrane on the inner side of the pit and the slope, lay a dry-pressed stone layer on the side of the lower section of the support structure close to the slope and in the pit, and pour a concrete layer on the outer side of the lower section of the support structure; S3. For the upper section of the support structure, a graded crushed stone layer is laid on the side that fits the slope surface, and a grid protective layer is set on the outside. A reinforced soil filling layer is filled between the grid protective layer and the graded crushed stone layer. The grid protective layer and the reinforced soil filling layer are constructed and arranged in layers and form a stepped layer along the upward inclination direction of the slope surface. The end of the support grid on the upper side of each stepped layer that is away from the slope surface is overlapped with the end of the top of the support grid on the lower side that is close to the slope surface; S4. Spray grass on the top layer of the geomembrane and the top of the reinforced soil filling layer and graded gravel layer of the corresponding ecological protection section to complete the construction of the flexible support structure.

[0013] Preferably, the ratio of the width of the support grid of each stepped layer toward the road direction to the height of the support grid is set to 2:1.

[0014] Preferably, in step S3, the overlap size is smaller than half of the width of the support grid.

[0015] The present invention includes at least the following beneficial effects: the fully weathered clastic rock flexible support structure of the present invention is arranged on the slope surface from bottom to top in sequence by the lower section of the support structure, the upper section of the support structure, and the ecological protection section, the lower section of the support structure includes a lower layer of geomembrane, a dry-pressed stone layer, and a concrete layer, the upper section of the support structure includes an upper layer of geomembrane, a graded crushed stone layer, a reinforced soil filling layer, and a grid protective layer, and the ecological protection section includes a top layer of geomembrane and a grass planting layer, which can well adapt to the inclined structural form of the slope surface, wherein the grid protective layer and the concrete layer serve as the outer protective wall of the flexible support structure as a whole, and have good structural stability and protective resistance Scouring capacity, graded crushed stone layer and dry-pressed stone layer are continuously arranged close to the slope side, with good water conductivity, which can divert environmental moisture to the drainage structure faster, which is beneficial to ensure the stability of the slope shape and reduce the effects of weathering, expansion and disintegration of clastic rock. The grid facing layer and reinforced soil filling layer are the main flexible structural parts, which can stabilize the slope, eliminate the soil pressure on some layered step surfaces, and extend the slope protection effect. The overall support structure is constructed in sections and layers, which can adapt to complex geology and harsh environment. The grid facing layer is overlapped up and down, and the structure is stable, which can significantly speed up the construction efficiency of the flexible support structure.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional structural diagram of the fully strongly weathered clastic rock flexible support structure of the present invention arranged at the slope; Figure 2 for Figure 1 A magnified structural diagram at A; Figure 3It is a structural schematic diagram of the rectangular frame net of the present invention; Figure 4 It is a structural schematic diagram of the inner supporting rod member and the outer supporting rod member of the present invention being arranged at the supporting grid; Figure numerals in the specification: 1. lower section of the support structure, 2. upper section of the support structure, 3. ecological protection section, 4. pits, 5. drainage structure, 6. lower layer of geomembrane, 7. dry-pressed stone layer, 8. concrete layer, 9. upper layer of geomembrane, 10. graded crushed stone layer, 11. reinforced soil filling layer, 12. grid protective layer, 13. top layer of geomembrane, 14. grass planting layer, 15. support grid, 16. inner support rod, 17. outer support rod, 18. spherical ring, 19. spherical block, 20. geogrid, 21. oblique rod, 22. end plate, 23. partition, 24. panel, 25. back plate, 26. cover plate. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0019] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] like Figure 1 As shown, the present invention provides a fully strongly weathered clastic rock flexible support structure, comprising a support structure lower section 1, a support structure upper section 2, and an ecological protection section 3 arranged in sequence from bottom to top along the slope direction, a road surface is dug downwardly with a pit 4 at the bottom of the slope, and a drainage structure 5 is arranged on the side of the pit 4 away from the slope surface; The lower section 1 of the support structure extends into the pit 4, and includes a geomembrane lower layer 6, a dry-pressed flaked stone layer 7, and a concrete layer 8 which are sequentially arranged from the inside to the outside. The geomembrane lower layer 6 covers the inner wall of the pit 4 and the corresponding slope area, the dry-pressed flaked stone layer 7 is arranged outside the geomembrane lower layer 6 and fills the pit 4, and the concrete layer 8 is poured and arranged outside the dry-pressed flaked stone layer 7 located above the pit 4, and the lower outer edge of the concrete layer 8 is aligned with the upper outer edge of the pit 4; The upper section 2 of the support structure is supported and arranged on the lower section 1 of the support structure, and includes a geomembrane upper layer 9, a graded crushed stone layer 10, a reinforced soil filling layer 11, and a mesh protective layer 12 which are sequentially arranged in a horizontal direction away from the slope surface. The geomembrane upper layer 9 is laid on the corresponding slope surface area, the graded crushed stone layer 10 is arranged along the slope surface inclination direction, the mesh protective layer 12 and the reinforced soil filling layer 11 are arranged in layers at the same height, and form a stepped structure in a direction parallel to the slope surface, and the outer side of the mesh protective layer 12 does not exceed the outer side of the concrete layer 8; The ecological protection section 3 includes a geomembrane top layer 13 and a grass layer 14 . The geomembrane top layer 13 covers the corresponding slope area, and the grass layer 14 is arranged on the outside of the geomembrane top layer 13 and on the top of the reinforced soil filling layer 11 and the graded gravel layer 10 .

[0021] For the convenience of explanation, Figure 1 The left and right directions are the width and transverse directions of the highway, and are also the horizontal directions of the vertical plane where the slope is inclined. First, the slope is leveled, and a fixed geomembrane is laid on the pit 4 and the slope. The geomembrane is made of two cloths and one membrane, which serves as a basic structural layer for waterproofing, moisture-proofing and anti-seepage on the slope. A dry-pressed flaked stone layer 7 is set on the inclined slope side of the lower section 1 of the supporting structure, which has good compression resistance and durability, and can effectively prevent the occurrence of roadbed slope collapse, landslides, etc. Compared with concrete, dry-pressed flaked stone does not need to be fixed with cement or other adhesive materials, which not only saves costs but also reduces engineering difficulty. The dry-pressed flaked stone layer 7 has good water permeability and air permeability, which is conducive to the drainage of moisture. The main structural part of the drainage is directly connected to the drainage structure 5, which is beneficial to improving the drainage effect under the effect of surface tension and pressure reduction, reducing the time that water stays on one side of the slope surface, and reducing the impact on the infiltration or temperature of the rock structure. When the inner slope rock layer is affected by weathering, the pores are larger than the gaps in the rock layer. As the heat dissipation and diffusion pores of the inner slope rock layer structure, the influence of thermal expansion and contraction of the rock layer is reduced, and the stability of the roadbed slope is maintained. The outer concrete layer 8 serves as the outer wall of the flexible support structure retaining wall, maintaining a fixed structural form, enhancing the protection effect, and facing the side of the highway, the external rainfall directly flows into the drainage structure 5 along the outer side of the concrete.

[0022] The upper section 2 of the supporting structure is located on the lower section 1 of the supporting structure and is arranged along the slope direction. Figure 1The left-right dimension is smaller than that of the lower section 1 of the supporting structure. The upper section 2 of the supporting structure includes a graded crushed stone layer 10, a reinforced soil filling layer 11, and a grid surface protection layer 12 arranged in sequence from right to left on the outside of the upper layer 9 of the geomembrane in the corresponding height range area. The graded crushed stone layer 10 can improve the bearing capacity, compression resistance and shock absorption of the road surface. At the same time, the graded crushed stone layer 10 is close to one side of the slope surface and docks with the dry-pressed flaked stone layer 7 below to drain excess water and improve drainage efficiency and drainage effect. The reinforced soil filling layer 11 is set to improve the stability and durability of the slope. It can be filled and set in layers according to the slope shape and the requirements of the stepped structure design. The friction between the soil particles and the reinforcement makes the reinforcement and the soil form a whole, thereby improving the stability of the soil. The grid protective layer 12 is also set to a stepped structure. The structural mesh design itself is conducive to maintaining structural stability and preventing soil loss. The side close to the slope is aligned with the corresponding side position of the concrete layer 8 and is arranged upward in layers, and the side away from the slope does not exceed the outer side of the concrete layer 8 for protection. The good permeability can ensure the free flow of water in the slope, adjust the water level, enhance the self-purification ability of the water body, reduce the groundwater pressure, and divert the moisture at the position of the grid protective layer 12 to flow into the drainage structure 5 along the outer side of the concrete layer 8. At the same time, the grid protective layer 12 is set to be connected in a grid, which is convenient for independent and rapid construction in sequence. After overlapping up and down, a stepped structure is formed to reduce the direct impact of rainwater on the outer side of the support structure.

[0023] The ecological protection section 3 is arranged outside the top layer 13 of the geomembrane, which will have a greening effect on the slope in the later stage, thereby improving the consolidation capacity of the soil relatively close to the top of the slope, making the water storage and drought resistance stronger, and the construction cost lower.

[0024] The fully strongly weathered clastic rock flexible support structure of the present invention is provided with a support structure lower section 1, a support structure upper section 2, and an ecological protection section 3 in sequence from bottom to top on the slope surface. The support structure lower section 1 includes a geomembrane lower layer 6, a dry-pressed flaked stone layer 7, and a concrete layer 8. The support structure upper section 2 includes a geomembrane upper layer 9, a graded crushed stone layer 10, a reinforced soil filling layer 11, and a grid protective layer 12. The ecological protection section 3 includes a geomembrane top layer 13 and a grass planting layer 14 ... Qualitative and protective anti-scouring ability, the graded crushed stone layer 10 and the dry-pressed stone layer 7 are continuously arranged close to the slope side, with good water conductivity, which can divert the environmental moisture to the drainage structure 5 more quickly, which is beneficial to ensure the stability of the slope shape and reduce the effects of weathering, expansion and disintegration of clastic rocks. The grid protective layer 12 and the reinforced soil filling layer 11 are the main flexible structural parts, which can stabilize the slope, eliminate the soil pressure on some layered step surfaces, and extend the slope protection effect. The overall support structure is segmented and layered, which can be designed specifically for complex geological and harsh environmental conditions, which is beneficial to improve construction efficiency.

[0025] In another technical solution, Figure 1-4 As shown, the grid protective surface layer 12 includes support grids 15 which are continuously arranged and connected in a horizontal direction parallel to the slope surface. The support grids 15 include a row of rectangular frame grids continuously arranged in the horizontal direction and improved soil filled in each rectangular frame grid. Between the upper and lower adjacent support grids 15, the end of the upper support grid 15 away from the slope surface is overlapped with the top end of the lower support grid 15 close to the slope surface.

[0026] Improved soil can be set as cement improved soil, cement and soil are mixed, and the cross-linking and gelling effects of cement are used to improve the mechanical and physical properties of the soil, improve the bearing capacity, impermeability and stability of the soil, and fill it in the rectangular frame net. The rectangular frame net of the support grid 15 includes end plates 22 on both sides of the length direction, partitions 23 between adjacent rectangular frame nets, a panel 24 facing the side of the highway, a back plate 25 facing the side of the slope surface and a cover plate 26 on the top. A rectangular frame net is formed under the protection of the side plate structure formed by the six-sided grid. Improved soil is filled in each rectangular frame net, which is stacked and connected on the concrete layer 8 to form a stepped shape upward. The construction efficiency is high, and the composition of the improved soil can be adjusted according to the slope environment and geological conditions to enhance the stability maintenance ability of the slope.

[0027] In another technical solution, Figure 4As shown, between the upper and lower adjacent support grids 15, an inner support rod 16 is arranged on the side close to the slope surface, and an outer support rod 17 is arranged on the side away from the slope surface. The inner support rod 16 includes an inner vertical rod, and the outer support rod includes an outer vertical rod. The length of the inner vertical rod is greater than the length of the outer vertical rod and the height of the support grid 15. A spherical ring 18 is arranged at the upper and lower ends of the inner vertical rod and the upper and lower ends of the outer vertical rod corresponding to the height range boundary of the support grid 15. A circle of limiting grooves is arranged in the middle of the spherical ring 18 along the circumferential direction. The upper and lower ends of the inner vertical rod are beyond the spherical ring 18 of the corresponding end, and the lower end of the inner vertical rod is anchored. Fixed on the top of the dry-pressed stone layer 7 or the top of the reinforced soil filling layer 11 on the lower side, the upper end of the inner vertical rod is anchored in the improved soil of the support grid 15 on the upper side, and the lower end of the outer vertical rod is arranged beyond the spherical ring 18 at the corresponding end and anchored in the improved soil of the support grid 15 on the lower side. Spherical blocks 19 are arranged at vertical intervals between a pair of spherical rings 18 on the inner vertical rod corresponding to the mesh holes of the rectangular frame net. The rectangular frame net is provided with hanging rings at the upper and lower ends of the vertical connection boundary outward in the horizontal direction. The hanging rings are made of elastic material and are hung in the limit grooves at the corresponding positions.

[0028] When constructing the support grid 15, inner support rods 16 and outer support rods 17 are arranged corresponding to the vertical ribs of the rectangular frame net. The arc frame net is on the side close to the slope, that is, the right side, and the upper side abuts against the upper support grid 15, the side facing the slope abuts against the reinforced soil filling layer 11 of the same layer, and the lower side abuts against the reinforced soil filling layer 11 of the lower layer. The lower side of the lowest support grid 15 abuts against the lower dry-pressed flaked stone layer 7; the arc frame net is on the side away from the slope, that is, the left side, and the lower side abuts against the lower layer of support grid 15. 15 is abutted, the bottom of the bottom support grid 15 is abutted against the lower concrete layer 8, and an inner support rod 16 and an outer support rod 17 are set, and the hanging ring at the corresponding top corner of the rectangular frame net is tightly sleeved in the limiting groove. The construction method is simple, and the connection between the rectangular frame net and the inner support rod 16 and the outer support rod 17 can be quickly realized. The upper and lower ends of the inner support rod 16 or the outer support rod 17 are respectively anchored to the structure on the corresponding side, so as to realize the further connection between the support grid 15 and the adjacent structure, and improve the tightness of the overall structural connection. The limiting groove of the spherical ring 18 just corresponds to the position of the corresponding transverse rib of the rectangular frame net. The limiting groove is set on the spherical ring 18. The spherical ring 18 can adapt to the mesh structure of the end of the rectangular frame net near the top corner to avoid deformation of the rectangular frame net. Similarly, the spherical block 19 set as needed forms a concave-convex matching structure with the adjacent structural layer without affecting the shape of the corresponding side plate of the rectangular frame net, thereby enhancing the connection with the adjacent structural layer.

[0029] In another technical solution, Figure 4As shown, a layer of geogrid 20 is laid horizontally between adjacent stepped layers of the reinforced soil filling layer 11, and a buckle is provided at the outer end corner of the geogrid 20 corresponding to the spherical ring 18, and a lock is provided corresponding to the rectangular frame net. The buckle is buckled in the limiting groove at the corresponding position, and the lock is buckled and connected with the mesh of the rectangular frame net at the corresponding position. The geogrid 20 of each layer is connected to the rectangular frame net and the inner support rod 16 and the outer support rod 17 by the provided lock and buckle, so that the support grid 15 of each layer is connected to the geogrid 20 as a whole, thereby strengthening the overall connectivity between the grid protective surface layer 12 and the reinforced soil filling layer 11, and improving the overall protection and stability maintenance capability of the flexible support structure. The lock and buckle can adopt the simple structure and steel wire rope material of the existing technology as needed to reduce the construction connection cost.

[0030] In another technical solution, Figure 4 As shown, an oblique rod 21 is connected to the side of the geogrid 20 close to the slope surface in a direction perpendicular to the slope surface. The oblique rod 21 is arranged at intervals in the horizontal plane. The lower end of the oblique rod 21 is anchored in the graded gravel layer 10, and the upper end of the oblique rod 21 is fixed in the upper reinforced soil filling layer 11. By connecting the oblique rod 21 to the geogrid 20 and inserting it into the upper and lower reinforced soil filling layers 11, the internal shear resistance of the stepped and layered reinforced soil filling layers 11 is further strengthened.

[0031] The present invention also provides a construction method for a fully weathered clastic rock flexible support structure, combining Figure 1-4 As shown, the following steps are included: S1. Determine the slope of the slope where the retaining wall support structure is located, design the construction area of ​​the support structure on the slope, divide the upper section 2, the lower section and the ecological protection section 3 of the branch support structure, level the slope, and construct the pit 4 of the support structure. The width of the pit 4 is consistent with the thickness of the support structure, and a drainage channel is set outside the pit 4.

[0032] S2. Lay a geomembrane on the inner side of the pit 4 and the slope, lay a dry-pressed stone layer 7 on the side of the lower section 1 of the supporting structure close to the slope and in the pit 4, and pour a concrete layer 8 on the outer side of the lower section 1 of the supporting structure.

[0033] S3. For the upper section 2 of the support structure, a graded crushed stone layer 10 is laid on the side that fits the slope surface, and a grid protective layer is set on the outside. A reinforced soil filling layer 11 is filled between the grid protective layer 12 and the graded crushed stone layer 10. The grid protective layer and the reinforced soil filling layer 11 are constructed and arranged in layers and form a stepped layer along the upward inclined direction of the slope surface, and the end of the upper support grid 15 away from the slope surface is overlapped with the end of the top of the lower support grid 15 close to the slope surface. When each stepped layer is constructed, a transverse connecting piece is set between the support grid 15 and the geogrid 20 of the reinforced soil filling, and an inclined support piece is set on the upper edge of the geogrid 20 of each layer in a direction perpendicular to the slope surface.

[0034] S4. Grass is sprayed on the top layer 13 of the geomembrane corresponding to the ecological protection section 3 and on the top of the reinforced soil filling layer 11 and the graded crushed stone layer 10 to complete the construction of the flexible support structure.

[0035] In this case, the slope is 1:1.25, the height of the pit 4 is set to 100 cm, and the left and right width of the upper section 2 of the support structure is designed to be 400 cm. The left and right dimensions of the grid protective layer of each step are 100 cm in width, 50 cm in height, and 38 cm in overlap width. The left side of the grid support layer is 50 cm away from the left side of the C20 concrete layer 8, and the dimension of the concrete layer 8 perpendicular to the slope surface is 80 cm. First, a pit 4 is excavated, and then the supporting structure is constructed upwards and away from the slope in sequence. The upper section 2 of the supporting structure is constructed in stepped layers as the main flexible structure, which can well adapt to the inclined structural form of the slope. The graded crushed stone layer 10 and the dry-pressed flaked stone layer 7 are continuously arranged close to the slope side and connected to the bottom drainage structure 5, which has good water conduction capacity. The grid protective layer is overlapped up and down, and the structure is stable. It can also significantly speed up the construction efficiency of the flexible supporting structure, save 20% of the cost compared with the traditional masonry solution, reduce the construction period by 1 / 3 compared with the traditional masonry, and reduce the number of excavation-induced slope instability by about 1 / 2.

[0036] In another technical solution, Figure 1-2 As shown, the ratio of the width of the support grid 15 of each stepped layer toward the highway to the height of the support grid 15 is set to 2:1, which is conducive to maintaining the continuity and stability of the structural connection of the stepped grid protective surface layer.

[0037] In another technical solution, Figure 1-2 As shown, in step S3, the overlap size is larger than half of the width of the support grid 15 and is set in coordination with the slope to ensure the structural connection strength.

[0038] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A fully weathered clastic rock flexible support structure, characterized in that: It includes a lower section of a support structure, an upper section of a support structure, and an ecological protection section arranged in sequence from bottom to top along the slope direction. A pit is dug downward at the bottom of the slope, and a drainage structure is arranged on the side of the pit away from the slope. The lower section of the support structure extends into the pit, including a lower geomembrane layer, a dry-pressed flaked stone layer, and a concrete layer arranged in sequence from the inside to the outside. The lower geomembrane layer covers the inner wall of the pit and the corresponding slope area, the dry-pressed flaked stone layer is arranged on the outside of the lower geomembrane layer and fills the pit, and the concrete layer is poured and arranged on the outside of the dry-pressed flaked stone layer located above the pit, and the lower outer edge of the concrete layer is aligned with the upper outer edge of the pit; The upper support of the supporting structure is arranged on the lower support structure, including a geomembrane upper layer, a graded crushed stone layer, a reinforced soil filling layer, and a mesh protective layer which are arranged in sequence in a horizontal direction away from the slope surface. The geomembrane upper layer is laid on the corresponding slope surface area, the graded crushed stone layer is arranged along the slope inclination direction, the mesh protective layer and the reinforced soil filling layer are arranged in layers at the same height and form a stepped structure in a direction parallel to the slope surface, and the outer side of the mesh protective layer does not exceed the outer side of the concrete layer; The ecological protection section includes a geomembrane top layer and a grass planting layer. The geomembrane top layer covers the corresponding slope area, and the grass planting layer is arranged on the outside of the geomembrane top layer and on the top of the reinforced soil filling layer and the graded gravel layer.

2. The fully weathered clastic rock flexible support structure according to claim 1, characterized in that: The grid protective surface layer includes support grids that are continuously arranged and connected in a horizontal direction parallel to the slope surface. The support grids include a row of rectangular frame grids continuously arranged in the horizontal direction and improved soil filled in each rectangular frame grid. Between the upper and lower adjacent support grids, the end of the upper support grid away from the slope surface is overlapped with the top end of the lower support grid close to the slope surface.

3. The fully weathered clastic rock flexible support structure according to claim 2 is characterized in that: An inner support rod is arranged between the upper and lower adjacent support grids on the side close to the slope surface, and an outer support rod is arranged on the side away from the slope surface, the inner support rod comprises an inner vertical rod, and the outer support rod comprises an outer vertical rod, the length of the inner vertical rod>the length of the outer vertical rod>the height of the support grid, a spherical ring is arranged at the upper and lower ends of the inner vertical rod and the upper and lower ends of the outer vertical rod respectively corresponding to the boundary of the height range of the support grid, a circle of limiting grooves is arranged in the middle part of the spherical ring along the circumferential direction, the upper and lower ends of the inner vertical rod are beyond the spherical rings at the corresponding ends, and the lower end of the inner vertical rod is anchored at the lower side The top of the dry-pressed stone layer or the top of the reinforced soil filling layer, the upper end of the inner vertical rod is anchored in the improved soil of the upper support grid, the lower end of the outer vertical rod exceeds the spherical ring at the corresponding end and is anchored in the improved soil of the lower support grid, spherical blocks are arranged at vertical intervals between a pair of spherical rings on the inner vertical rod corresponding to the mesh holes of the rectangular frame net, and the rectangular frame net is provided with hanging rings at the upper and lower ends of the vertical connection boundary outward in the horizontal direction, the hanging rings are made of elastic material, and are hung in the limit grooves at the corresponding positions.

4. The fully weathered clastic rock flexible support structure according to claim 3 is characterized in that: A layer of geogrid is laid horizontally between adjacent step layers of the reinforced soil filling layer. A buckle ring is provided at the outer end corner of the geogrid corresponding to the spherical ring, and a lock buckle is provided corresponding to the rectangular frame net. The buckle ring is buckled in the limiting groove at the corresponding position, and the lock buckle is buckled and connected to the mesh of the rectangular frame net at the corresponding position.

5. The fully weathered clastic rock flexible support structure according to claim 4, characterized in that: On one side of the geogrid close to the slope, an oblique rod is connected in a direction perpendicular to the slope. The oblique rods are arranged at intervals in the horizontal plane. The lower ends of the oblique rods are anchored in the graded gravel layer, and the upper ends of the oblique rods are fixed in the reinforced soil filling layer on the upper side.

6. The construction method of the fully weathered clastic rock flexible support structure according to claim 1, characterized in that: The steps include: S1. Determine the slope of the slope where the retaining wall support structure is located, design the construction area of ​​the support structure on the slope, divide the upper and lower sections of the support structure and the ecological protection section, level the slope, and construct the pits of the support structure. The width of the pits should be consistent with the thickness of the support structure, and a drainage channel should be set outside the pits; S2. Lay geomembrane on the inner side of the pit and the slope, lay a dry-pressed stone layer on the side of the lower section of the support structure close to the slope and in the pit, and pour a concrete layer on the outer side of the lower section of the support structure; S3. For the upper section of the support structure, a graded crushed stone layer is laid on the side that fits the slope surface, and a grid protective layer is set on the outside. A reinforced soil filling layer is filled between the grid protective layer and the graded crushed stone layer. The grid protective layer and the reinforced soil filling layer are constructed and arranged in layers and form a stepped layer along the upward inclination direction of the slope surface. The end of the support grid on the upper side of each stepped layer that is away from the slope surface is overlapped with the end of the top of the support grid on the lower side that is close to the slope surface; S4. Spray grass on the top layer of the geomembrane and the top of the reinforced soil filling layer and graded gravel layer of the corresponding ecological protection section to complete the construction of the flexible support structure.

7. The construction method of the fully weathered clastic rock flexible support structure according to claim 6 is characterized in that: The ratio of the width of the support grid of each stepped layer toward the road to the height of the support grid is set to 2:

1.

8. The construction method of the fully weathered clastic rock flexible support structure according to claim 6 is characterized in that: In step S3, the overlap size is smaller than half of the width of the support grid.

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