Rigid-flexible combined type high and steep slope rockfall protection structure and construction method thereof

Abstract

The invention relates to a rigid-flexible combined type high and steep slope rockfall protection structure and a construction method thereof. The method comprises the steps that slope cutting treatment is conducted on the high and steep slope, a plurality of horizontal flat areas are formed near the slope surface after slope cutting, and transition inclined flat areas are formed between the horizontal flat areas adjacent in height; stone blocking wall anchoring piles are arranged in the flat area, rope anchor rods and bases are preset on the top, and transversely continuous prefabricated concrete slabs are arranged on the back faces of the stone blocking wall anchoring piles and are poured into a whole with the stone blocking wall anchoring piles; laying a dry masonry rubble buffer layer on the back surface of the precast concrete slab, and digging a stone falling groove downwards behind the dry masonry rubble buffer layer; steel columns are installed on the base, and a flexible passive protective net is hung between the steel columns. The rigid pile plate type stone blocking wall and the flexible passive protection net are combined to form a protection whole, and the protection effect and the structural stability when high-energy rockfall occurs are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of slope protection, and in particular to a rigid-flexible combined high-steep slope rockfall protection structure and a construction method thereof. Background Art

[0002] The development and utilization of high and steep slopes in mountainous areas is becoming more and more frequent. In major engineering projects such as highways, railways and urban construction, high and steep slopes are often inevitably exposed to construction and natural environments, and are extremely susceptible to natural factors, leading to an increase in the risk of rockfall. Such rockfall not only poses a serious threat to the facilities and personnel below the slope, but may also cause secondary disasters, resulting in immeasurable economic losses and social impacts.

[0003] However, traditional rockfall protection measures mainly include single forms such as rigid structures and flexible protective nets, which have great limitations in practical applications. Rigid structures such as concrete rock walls have high strength and stability, but their dissipation effect on rockfall impact energy is poor, and they are prone to structural damage under the impact of large-scale rockfalls. At the same time, rigid structures have high construction costs and poor adaptability to terrain. Flexible protective nets such as wire rope nets and ring nets have good deformation ability and energy dissipation effects, but their protective capabilities are limited when dealing with large-scale, high-energy rockfalls, and the protective nets are prone to damage or failure.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a rigid-flexible combined high-steep slope rockfall protection structure and a construction method thereof, so as to solve the problem that a single rigid structure has poor effect in dissipating the impact energy of falling rocks, and the problem that a single flexible protection net has limited protection capability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A construction method for a rigid-flexible combined high-steep slope rockfall protection structure, the method comprising:

[0008] The steep slope is cut to form multiple horizontal flat areas near the slope surface after the slope is cut, and a transitional oblique flat area is formed between the horizontal flat areas adjacent in height;

[0009] The stone retaining wall anchor piles are evenly arranged transversely in the horizontal flat area and the transitional oblique flat area, rope anchor rods and bases are preset on the top of the stone retaining wall anchor piles, and transversely continuous precast concrete slabs are arranged on the back of the stone retaining wall anchor piles and cast together with the stone retaining wall anchor piles;

[0010] A dry-laid stone buffer layer is laid on the back of the precast concrete slab, and a rock fall chute is excavated downwards behind the dry-laid stone buffer layer;

[0011] Steel columns are installed on the base, and flexible passive protection nets are hung between the steel columns. The bottom of the flexible passive protection net is fixed to the top and sides of the stone retaining wall anchor piles through transverse and vertical reinforcement anchor rods.

[0012] Furthermore, a plurality of stone retaining wall anchor piles are staggered front to back, and the broken lines are arranged in the horizontal flat area and the transitional oblique flat area.

[0013] Furthermore, connecting steel bars are reserved on the front side of the precast concrete slab, and when the stone retaining wall anchor piles are cast, the connecting steel bars of the precast concrete slab are tied together with the internal steel bars of the stone retaining wall anchor piles.

[0014] Furthermore, the back side of the dry-laid gravel buffer layer is paved with an inclined surface.

[0015] Furthermore, the base and steel column are preset at the top of some of the stone retaining wall anchor piles, including two stone retaining wall anchor piles near the bottom stone retaining wall anchor piles and two stone retaining wall anchor piles near the top stone retaining wall anchor piles, and the base and steel column are preset at intervals of the remaining stone retaining wall anchor piles.

[0016] Furthermore, rope anchors are preset at the top of the bottom rock retaining wall anchor piles and the top rock retaining wall anchor piles, including end support rope anchor points, lower support anchor points, upper support anchor points and side pull rope anchor points.

[0017] Furthermore, the flexible passive protection net has an upper support rope at the top and a lower support rope at the bottom, the end of the upper support rope is fixed to the upper support anchor point, and the end of the lower support rope is fixed to the lower support anchor point.

[0018] Furthermore, an end support rope is fixed to the end support rope anchoring point, and the other end of the end support rope is fixed to the end of the flexible passive protection net.

[0019] Furthermore, a side pull rope is fixed on the side pull rope anchoring point, and the other end of the side pull rope is fixed on both sides of the slope or the stone wall anchoring pile.

[0020] On the other hand, a rigid-flexible combined high-steep slope rockfall protection structure constructed by the method described above is provided, characterized in that:

[0021] The protective structure includes stone retaining wall anchor piles evenly arranged laterally in a horizontal flat area near the slope surface after slope cutting and in a transitional oblique flat area. The stone retaining wall anchor piles are cast as one piece with the precast concrete slabs on the back thereof. A dry-laid stone crushed stone cushion layer is provided on the back of the precast concrete slab. A rockfall chute is provided behind the dry-laid stone crushed stone cushion layer. A flexible passive protective net is hung on the top of the stone retaining wall anchor piles.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a rigid-flexible combined high-steep slope rockfall protection structure and a construction method thereof, which combines a rigid pile-plate rock retaining wall and a flexible passive protection net to form a protective whole, overcomes the limitations of existing single rockfall protection measures, and forms a multi-layer protection system by arranging a dry-laid gravel buffer cushion layer and a rockfall trough on the rear side of the pile-plate rock retaining wall, and installing a passive protection net above the pile-plate rock retaining wall, thereby greatly improving the rockfall protection effect, ensuring the safety and stability of the slope area, and especially improving the protection effect and structural stability when facing high-energy rockfall. Through the implementation of the present invention, the harm of rockfall on the lower area of ​​the high-steep slope can be effectively reduced, the service life and stability of the protection structure can be improved, and the long-term maintenance cost can be reduced, which has broad application prospects and practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the protection structure of the present invention.

[0026] Figure 2 Detailed view of the flexible passive protection net installed above the rigid pile-sheet stone retaining wall of the present invention.

[0027] Figure 3 It is a top view schematic diagram of the rigid pile-sheet stone retaining wall of the present invention.

[0028] Figure 4 It is a schematic diagram of the rope anchor rod of the present invention.

[0029] The symbols in the figure are:

[0030] 1-high and steep slope, 2-original slope, 3-slope after cutting, 4-bottom stone retaining wall anchor pile, 5-precast concrete slab, 6-dry masonry gravel buffer layer, 7-rockfall chute, 8-flexible passive protection net, 9-anchor rope, 10-rope anchor rod, 11-base, 12-steel column, 13-passive protection net mesh, 14-upper support rope, 15-lower support rope, 16-top stone retaining wall anchor pile, 17-end support rope anchor point, 18-lower support anchor point, 19-upper support anchor point, 20-side pull rope Anchoring points, 21-the first stone wall anchoring pile, 22-the second stone wall anchoring pile, 23-the third stone wall anchoring pile, 24-the fourth stone wall anchoring pile, 25-the fifth stone wall anchoring pile, 26-the sixth stone wall anchoring pile, 27-the seventh stone wall anchoring pile, 28-the eighth stone wall anchoring pile, 29-the ninth stone wall anchoring pile, 30-the tenth stone wall anchoring pile, 31-the eleventh stone wall anchoring pile, 32-the twelfth stone wall anchoring pile, 33-the thirteenth stone wall anchoring pile, 34-reinforcement anchor rod. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0032] In the description of the present invention, it is necessary to understand that the terms "front", "rear", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inside", "outside", "front", "back" 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, rather than indicating or implying 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.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "setting" and the like should be understood in a broad sense, for example, it can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Of course, such objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0035] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0036] In a specific implementation, Figure 2 The direction from left to right in the text is defined as horizontal. Figure 1 The left side of the image is positioned as the back side, and the Figure 1 The right side in is defined as the front side.

[0037] In the rockfall protection project on steep slopes, when concrete rock retaining walls are used, the construction period is long, the cost is high, and the effect of dissipating the impact energy of rockfall is poor. When flexible protection nets are used, although the cost is low, the construction is fast, and the impact energy of rockfall can be dissipated, the protection capacity is limited and the durability is poor. The protection structure of the present invention combines a rigid pile-plate rock retaining wall and a flexible passive protection net. The rigid pile-plate rock retaining wall adopts a pile-plate combined structure, which is faster to construct than a concrete rock retaining wall and has a stronger protection capacity.

[0038] Specifically, Figure 1 and Figure 2 The present invention provides a construction method for a rigid-flexible combined high-steep slope rockfall protection structure, which specifically includes the following steps:

[0039] S1: The steep slope 1 that needs to be protected is cut to meet the requirements for building a protective structure, the original slope surface 2 is excavated, and multiple horizontal flat areas are formed near the slope surface 3 after the slope is cut, and transitional oblique flat areas are formed between the horizontal flat areas adjacent in height.

[0040] Flat areas are built according to the specific terrain of high and steep slopes, such as Figure 2 In the embodiment, the flat area has three horizontal flat areas and two transitional oblique flat areas.

[0041] Before cutting the slope, it is necessary to conduct a detailed geological survey to measure the slope gradient, rock properties, crack development and other data. According to the survey results, a slope cutting plan is formulated to ensure the stability of the slope after cutting. In order to ensure construction safety and slope stability, the slope is cut in sections. The length and height of each section are determined according to geological conditions, usually not exceeding 5 meters in height. The upper slope is cut first to ensure that the slope is stable before cutting the next layer. During the slope cutting process, the displacement of the slope and the expansion of cracks are monitored in real time, and the slope cutting plan is adjusted if necessary to ensure the stability of the slope and the safety of slope cutting.

[0042] S2: The stone retaining wall anchor piles are evenly arranged in the horizontal flat area and the transitional inclined flat area, and the bottom of the stone retaining wall anchor piles should be deep into the internal bearing layer of the high and steep slope. The rope anchor rod 10 and the base 11 are preset on the top of the stone retaining wall anchor pile, and the transverse continuous precast concrete slab 5 is set on the back of the stone retaining wall anchor pile and cast as one with the stone retaining wall anchor pile.

[0043] According to the site conditions and pile length, the stone wall anchor piles are cast in sections. After each section is cast, sufficient maintenance and testing are carried out to ensure the strength and stability of the stone wall anchor piles before casting the next section.

[0044] Multiple rock retaining wall anchor piles can be arranged horizontally in a straight line or staggered front to back, with broken lines arranged in horizontal flat areas and transitional oblique flat areas. This can greatly reduce the hazards caused by the direct impact of falling rocks on the protective structure and achieve the purpose of reducing the impact energy of falling rocks.

[0045] In some embodiments, to achieve the best anchoring effect, the lower part of the stone retaining wall anchor pile needs to penetrate into the bedrock of the steep slope. The total length is 12m, the pile length inside the bedrock is 7m, and the pile length above the bedrock is 5m. The cross-section is rectangular, with a length × width of 2.0m × 1.5m.

[0046] The precast concrete slab 5 is a factory prefabricated structure, and a connecting steel bar is reserved on its front during prefabrication. When the stone wall anchor pile is cast, the connecting steel bar of the precast concrete slab 5 is tied together with the internal steel bar of the stone wall anchor pile to form a pile-slab structure and bear the force together. In addition, the reserved connecting steel bar can effectively avoid damage to the pile foundation caused by drilling later. When installing the precast concrete slab, the connecting steel bar is first embedded in the anchor pile to ensure that it is firmly tied with the steel bar of the precast concrete slab.

[0047] A certain distance of expansion joints should be reserved between the precast concrete slabs 5 horizontally, not less than 0.02m.

[0048] Compared with concrete stone retaining walls, precast concrete panels are prefabricated in factories, and all processing and treatment are completed in a controlled environment, avoiding the complex procedures and uncertainties required for on-site pouring. This greatly shortens the on-site construction time and improves construction efficiency. Factory-prefabricated concrete panels are superior to on-site cast concrete walls in terms of quality control and processing accuracy. During the prefabrication process, the strength of the concrete, the accuracy of the reinforcement, and the surface flatness of the panel can be strictly controlled to ensure the stability and durability of the structure. Precast concrete panels are prefabricated with connecting steel bars during manufacturing. During pouring, the connecting steel bars are tied together with the steel bars inside the stone retaining wall anchor piles. This design not only enhances the overall force performance of the pile-slab structure, but also avoids damage to the pile foundation caused by drilling during the later construction process, thereby extending the service life of the structure. In addition, since the connection between the precast concrete panels and the anchor piles is achieved through reserved steel bars, this method makes it easier to repair and replace the structure when it is damaged by external forces, reducing the difficulty and cost of later maintenance.

[0049] S3: a dry-laid gravel buffer layer 6 is laid on the back of the precast concrete slab 5, and a rock-falling chute 7 is excavated downward behind the dry-laid gravel buffer layer 6.

[0050] The thickness and slope of the buffer layer are determined according to the energy of the falling rocks and the terrain conditions. When laying, the layer is carried out in layers, and the thickness of each layer of gravel does not exceed 20 cm. A vibrator is used to compact the gravel layer to ensure the density and stability of the gravel layer. During the excavation process, the flatness and slope of the bottom of the trench are strictly controlled to ensure that the falling rocks can slide smoothly into the trench. A gravel layer is laid at the bottom of the trench to enhance the drainage capacity. In order to prevent the trench wall from collapsing, temporary support structures such as steel mesh and shotcrete are installed immediately after the excavation is completed. Depending on the stability of the trench wall, decide whether to carry out permanent retaining wall construction.

[0051] The dry-laid slab gravel buffer layer 6 is formed by the accumulation of dry-laid slab gravel, which again serves the purpose of dissipating the impact energy of falling rocks. The dry-laid slab gravel can be obtained locally, is pollution-free to the environment, and meets the needs of ecological construction. The dry-laid slab gravel buffer layer 6 is laid in a trapezoidal structure, and the back is laid in an inclined surface, with a top width greater than or equal to 0.5 meters and a slope of 1:0.75, which can weaken the impact of falling rocks on the rigid pile-board stone retaining wall structure, prevent falling rocks from directly impacting the stone retaining wall structure, and reduce damage to the structure.

[0052] The rockfall chute 7 is an inverted trapezoidal structure, which should be wide and deep enough, with a depth of not less than 2m and a bottom width of not less than 2m, to accommodate and intercept larger rockfalls. The rockfall chute 7 can guide and control the path of the rockfall, so that it slides or rolls along a predetermined direction, avoiding the uncontrollable risks caused by random rolling, and the rockfall chute 7 also has a drainage function to reduce the erosion of water flow on the slope and protective structure.

[0053] S4: Install steel columns 12 on the base 11, hang the flexible passive protection net 8 between the steel columns 12, and fix the bottom of the flexible passive protection net 8 to the top and side of the stone wall anchor pile through transverse and vertical reinforcement anchor rods 34. During the installation of the protection net, add transverse and vertical reinforcement measures to further improve the impact resistance and stability of the protection net.

[0054] The base 11 and the steel column 12 are preset on the top of some of the rock wall anchor piles, including two rock wall anchor piles near the bottom rock wall anchor pile 4 and two rock wall anchor piles near the top rock wall anchor pile 16, and the base 11 and the steel column 12 are preset between the rock wall anchor piles. Figure 2 In the embodiment, a base 11 and a steel column 12 are preset on the top of the first stone retaining wall anchor pile 21, the second stone retaining wall anchor pile 22, the fourth stone retaining wall anchor pile 24, the sixth stone retaining wall anchor pile 26, the eighth stone retaining wall anchor pile 28, the tenth stone retaining wall anchor pile 30, the twelfth stone retaining wall anchor pile 32 and the thirteenth stone retaining wall anchor pile 33.

[0055] The base 11 is made of φ28 threaded steel, embedded in the pile foundation to a depth of 1m, and exposed to the outside to a size of 0.1m. The reinforcement anchor rod 34 is made of φ32 threaded steel.

[0056] The rope anchor rod 10 is preset at the top of the bottom rock wall anchor pile 4 and the top rock wall anchor pile 16, including an end support rope anchor point 17, a lower support anchor point 18, an upper support anchor point 19 and a side pull rope anchor point 20. Figure 3. Among them, the end support rope anchor point 17, the lower support anchor point 18, and the upper support anchor point 19 are arranged in a line 0.45m away from the upper boundary of the stone retaining wall anchor pile. The side pull rope anchor point 20 is arranged 0.8m to the side of the above three rope anchor rods 10. The depth of the pre-buried rope anchor rod is 2.5m, and the rope anchor rod is made of φ32 threaded steel. The flexible passive protection net 8 has an upper support rope 14 at the top and a lower support rope 15 at the bottom. The end of the upper support rope 14 is fixed to the upper support anchor point 19, and the end of the lower support rope 15 is fixed to the lower support anchor point 18. An end support rope is fixed to the end support rope anchor point 17, and the other end of the end support rope is fixed to the end of the flexible passive protection net 8. The end support rope anchor point 17 plays a key supporting and stabilizing role in the rigid-flexible combined high-steep slope rockfall protection structure. Its main function is to fix and stabilize the two ends of the flexible passive protection net, ensuring that the protection net can effectively withstand and disperse stress when impacted by falling rocks, and maintain the stability and reliability of the overall structure. Since the end support rope anchor point is firmly fixed to the rock wall anchor pile, these impact forces are dispersed and further transmitted to the anchor pile and bedrock, preventing the protection net from being damaged or falling off when impacted. This process significantly enhances the impact resistance of the protection structure and ensures that the structure can still work effectively in the case of high-energy rockfall. The side pull rope anchor point 20 is fixed with a side pull rope, and the other end of the side pull rope is fixed on both sides of the slope or the rock wall anchor pile. The side pull rope anchor point provides additional lateral support by fixing the side pull rope, so that the flexible protection net can remain stable when subjected to lateral impact. High and steep slopes often have irregular terrain and complex rockfall movement trajectories, and falling rocks may impact the protection net from the side. The side pull rope anchor point prevents the protection net from excessive deformation or tilting due to lateral impact by fixing the side pull rope on both sides of the slope or the anchor pile. This is particularly important because insufficient lateral stability can cause the protection net to tilt or fail in some areas when impacted by falling rocks, affecting the overall protection effect. The side rope anchorage points effectively solve this problem, ensuring that the protection net has good impact resistance in all directions. The end support rope anchorage point 17, the lower support anchorage point 18, the upper support anchorage point 19 and the side rope anchorage point 20 can all be used. Figure 4 structural form.

[0057] The flexible passive protection net 8 can increase the overall height of the protection structure, thereby expanding the scope of intercepting falling rocks and preventing rocks rolling down from high places from passing over the rock-blocking wall. The flexible passive protection net 8 has good deformation ability and can absorb and disperse the impact energy when intercepting falling rocks. Through multi-layer protection and energy dispersion, the flexible passive protection net 8 can extend the service life of the protection structure, reduce the need for frequent repairs and replacements, and reduce long-term maintenance costs.

[0058] Through the above construction method, a rigid-flexible combined high-steep slope rockfall protection structure is constructed, which includes horizontally evenly arranged rock retaining wall anchor piles in the horizontal flat area near the slope surface 3 after the slope is cut and in the transition oblique flat area. The rock retaining wall anchor piles are cast as one with the precast concrete slab 5 on the back thereof, and a dry-laid stone rubble cushion layer 6 is arranged on the back of the precast concrete slab 5. A rockfall trough 7 is arranged behind the dry-laid stone rubble cushion layer 6, and a flexible passive protection net 8 is hung on the top of the rock retaining wall anchor pile. Among them, the rock retaining wall anchor piles and the precast concrete slab 5 constitute a rigid pile-plate rock retaining wall.

[0059] The protective structure is a combination of rigidity and flexibility, suitable for steep slopes, effectively improving the safety of high and steep slope areas, and preventing falling rocks from threatening roads, buildings and other facilities below. The rigid pile-plate rock retaining wall and the flexible passive protective net 8 can intercept rocks that roll or slide down the slope, and the rockfall chute 7 further collects and guides the rockfall path to prevent the rocks from rolling randomly and reduce risks. The dry-laid gravel cushion layer 6 can effectively absorb and disperse the impact energy of falling rocks, reduce the damage of falling rocks to the protective structure and the surrounding environment, and improve the durability of the overall structure. The rigid pile-plate rock retaining wall and the flexible passive protective net 8 form a multi-level protection system that can not only intercept large rocks, but also handle smaller and lower-energy falling rocks, providing all-round protection. After installation, the protective structure can work effectively for a long time, reduce the slope maintenance and cleaning work caused by frequent rockfalls, and reduce maintenance costs.

[0060] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A construction method for a rigid-flexible combined high-steep slope rockfall protection structure, characterized in that: The method comprises: The steep slope (1) is cut to form a plurality of horizontal flat areas near the slope surface (3) after the slope cutting, and a transitional oblique flat area is formed between the horizontal flat areas adjacent in height; The rock-blocking wall anchor piles are evenly arranged transversely in the horizontal flat area and the transition oblique flat area, a rope anchor rod (10) and a base (11) are preset on the top of the rock-blocking wall anchor piles, and a transversely continuous precast concrete slab (5) is arranged on the back of the rock-blocking wall anchor piles and cast together with the rock-blocking wall anchor piles; A dry-laid stone buffer layer (6) is laid on the back of the precast concrete slab (5), and a rock fall chute (7) is excavated downward behind the dry-laid stone buffer layer (6); Steel columns (12) are installed on the base (11), and a flexible passive protection net (8) is hung between the steel columns (12). The bottom of the flexible passive protection net (8) is fixed to the top and side of the stone wall anchor pile through transverse and vertical reinforcement anchor rods (34).

2. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 1 is characterized by: A plurality of stone retaining wall anchor piles are staggered front and back, and the broken lines are arranged in the horizontal flat area and the transitional inclined flat area.

3. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 1 is characterized by: The front side of the precast concrete slab (5) is provided with connection steel bars. When the stone retaining wall anchor piles are cast, the connection steel bars of the precast concrete slab (5) are tied together with the internal steel bars of the stone retaining wall anchor piles.

4. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 1 is characterized by: The back side of the dry-laid slab crushed stone buffer layer (6) is paved in an inclined surface.

5. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 1 is characterized by: The base (11) and the steel column (12) are preset on the top of some of the stone wall anchor piles, including two stone wall anchor piles close to the bottom stone wall anchor pile (4) and two stone wall anchor piles close to the top stone wall anchor pile (16). The base (11) and the steel column (12) are preset at intervals of the remaining stone wall anchor piles.

6. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 1 is characterized by: The rope anchor rod (10) is preset at the top of the bottom rock retaining wall anchor pile (4) and the top rock retaining wall anchor pile (16), and includes an end support rope anchor point (17), a lower support anchor point (18), an upper support anchor point (19) and a side pull rope anchor point (20).

7. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 6 is characterized by: The top of the flexible passive protection net (8) is provided with an upper support rope (14) and the bottom is provided with a lower support rope (15). The end of the upper support rope (14) is fixed to an upper support anchor point (19), and the end of the lower support rope (15) is fixed to a lower support anchor point (18).

8. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 6 is characterized by: An end support rope is fixed on the end support rope anchor point (17), and the other end of the end support rope is fixed to the end of the flexible passive protection net (8).

9. The construction method of the rigid-flexible combined high-steep slope rockfall protection structure according to claim 6 is characterized by: A side pull rope is fixed on the side pull rope anchor point (20), and the other end of the side pull rope is fixed on both sides of the anchor pile of the slope or the stone wall.

10. The rigid-flexible combined high-steep slope rockfall protection structure constructed by the method of claim 1 is characterized by: The protective structure comprises rock retaining wall anchor piles uniformly arranged laterally in a horizontal flat area near the slope surface (3) after the slope is cut and in a transition oblique flat area, the rock retaining wall anchor piles are cast as one piece with the precast concrete slab (5) on the back thereof, a dry-laid stone crushed stone cushion layer (6) is arranged on the back of the precast concrete slab (5), a rock drop chute (7) is arranged behind the dry-laid stone crushed stone cushion layer (6), and a flexible passive protective net (8) is hung on the top of the rock retaining wall anchor piles.

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