A flexible blocking protection structure suitable for valley slope mudslide and high-position collapse rockfall

Abstract

The present application relates to the technical fields of debris flow and collapse rockfall, and discloses a flexible blocking protection structure suitable for valley slope debris flow and high-position collapse rockfall, which comprises a blocking protection net, the blocking protection net comprises an upper blocking protection net structure for blocking high-position collapse rockfall and a lower blocking protection net structure for intercepting valley debris flow substances, the lower blocking protection net structure is connected with a valley through climbing beams on both sides, the upper blocking protection net structure is connected through support piles in the middle, the support piles are connected with a mountain body through anchor cables on the side, and both sides of the upper protection net are connected with a valley slope surface through ground beams. The blocking protection net comprises a plurality of vertically and crossly arranged flexible horizontal steel strands and flexible vertical steel strands. The flexible blocking protection structure suitable for valley slope debris flow and high-position collapse rockfall is adopted, so that the debris flow and high-position collapse rockfall can be blocked and protected, and the blocking protection net has the advantages of low cost, high toughness and easy maintenance on the basis of high protection height and large energy level.

Description

Technical Field

[0001] This invention relates to the field of debris flow and rockfall technology, and in particular to a flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls. Background Technology

[0002] Valley slope debris flows refer to special torrents carrying large amounts of mud, sand, rocks, and boulders, formed by precipitation (heavy rain, glacial meltwater, and snowmelt) on multi-valley terrain or mountain slopes in mountainous areas or other areas with steep terrain. They are characterized by suddenness, high velocity, large flow volume, large material capacity, and strong destructive power. Furthermore, some debris flow gullies have large amounts of high-altitude, high-risk rock masses on their upper steep slopes. Once a collapse or rockfall occurs, the rocks will slide or roll rapidly down the gully or slope, generating large impact energy and unpredictable bounce height, inevitably threatening the operational safety of road and railway projects or human settlements.

[0003] In the field prevention and control of debris flows, the construction of retaining dams and other structures to block debris flow materials is often employed. However, constructing retaining dams in debris flow gullies with multiple valley slopes is difficult, costly, and challenging to maintain. Furthermore, current methods for managing high-energy, high-position rockfalls mainly include in-situ remediation and passive barriers. Traditional passive barrier technologies primarily consist of passive protective nets and rockfall walls. Extensive experimental studies have shown that these protective structures can only withstand a maximum energy level of 5000 KJ, and their barrier height is relatively low (generally not exceeding 6 meters). Their ability to protect against high-energy rockfalls is limited, and they are highly susceptible to failure in high-mountain and canyon areas. Therefore, there is an urgent need to explore new barrier technologies capable of resisting the impact of high-energy rockfalls.

[0004] In recent years, flexible barrier technology has seen continuous development and widespread application. High-energy flexible barrier structures, as a novel passive prevention technology for debris flows and high-altitude rockfalls, are primarily developed through innovations in structural design, material composition, and construction techniques. This makes them suitable for intercepting debris flows from valley slopes and high-altitude, high-risk rockfalls, thus protecting the normal operation of highways, railways, and other road infrastructure and safeguarding people's property. As my country's transportation engineering construction expands into high mountain and canyon areas, it will inevitably face more challenges in protecting against valley-type debris flows and high-altitude rockfalls. Therefore, there is an urgent need to develop new high-energy flexible barrier structures suitable for complex mountainous terrain with multiple valley slopes, capable of protecting against various geological hazards such as debris flows and high-altitude rockfalls. Summary of the Invention

[0005] To address the problems mentioned in the background art, the purpose of this invention is to provide a flexible retaining and protection structure suitable for valley slope debris flows and high-altitude rockfalls. This structure can protect against high-altitude rockfalls and debris flows on mountain valley slopes. The retaining and protection netting is low in cost, strong in toughness, and easy to maintain while maintaining a high level of protection.

[0006] To achieve the above objectives, the present invention provides a flexible retaining and protection structure applicable to valley slope debris flows and high-level landslides and rockfalls. The retaining and protection net includes an upper retaining and protection net structure for retaining high-level landslides and rockfalls and a lower retaining and protection net structure for intercepting debris flow materials in the valley. The two sides of the lower retaining and protection net structure are connected to the valley by climbing beams. The climbing beams are set in the valley and are connected to the valley by reverse prestressed anchor cables. The upper retaining and protective net structure is connected to the ground beam through support piles. The support piles are laterally connected to the mountain through anchor cables. The ground beam is set on the mountain slope and is connected to the mountain through reverse prestressed anchor cables. The bottom of the retaining and protective net is connected to the bottom of the mountain valley through a concrete structure. The retaining and protective net consists of several flexible horizontal steel strands and flexible vertical steel strands that are set vertically.

[0007] Preferably, the perpendicular intersections of the flexible horizontal steel strands and the flexible vertical steel strands are connected by snap-fit. Both the flexible horizontal steel strands and the flexible vertical steel strands are NPR steel strands. The flexible horizontal steel strands include horizontal steel strand one and horizontal steel strand two, with horizontal steel strand one positioned above horizontal steel strand two.

[0008] Preferably, the first type of horizontal steel strands and the second type of flexible vertical steel strands arranged vertically intersect form the upper barrier and protection net structure, while the third type of horizontal steel strands and the second type of flexible vertical steel strands arranged vertically intersect form the lower barrier and protection net structure.

[0009] Preferably, the second horizontal steel strand is fixedly connected to the climbing beam, and the climbing beam is provided with an anchor cable hole. One end of the first reverse prestressed anchor cable is placed in the first anchor cable hole, and the other end of the first reverse prestressed anchor cable is anchored to the ditch.

[0010] Preferably, the first horizontal steel strand is connected by a support pile, one side of the horizontal steel strand is connected to the ground beam, the ground beam is provided with the second anchor cable hole, one end of the second reverse prestressed anchor cable is placed in the second anchor cable hole, and the other end of the second reverse prestressed anchor cable is anchored to the mountain.

[0011] Preferably, the bottom of the support pile is connected to the mountain through the pile foundation, and the side of the support pile is provided with anchor cable hole three. One end of the anchor cable is placed in the anchor cable hole three, and the other end of the anchor cable is anchored to the mountain.

[0012] Preferably, the spacing between adjacent horizontal steel strands is greater than the spacing between adjacent horizontal steel strands.

[0013] Preferably, the spacing between adjacent horizontal steel strands satisfies the following relationship: in, The spacing between adjacent horizontal steel strands. The quantity of the horizontal steel strands. V The equivalent volume of the collapsed rocks; Quantity of horizontal steel strand 1 The following relationship must be satisfied: in, M For the quality of the collapsed rocks, H The elevation difference between the location of the rockfall and the point of contact between the rockfall and the impact barrier. Work is done during the plastic stage of a single bundle of transverse steel strands. Work is done for the failure stage of a single bundle of transverse steel strands. To apply the initial preload to the single bundle of transverse steel strands, The yield critical force of a single strand of transverse steel wire. L The length of a single bundle of horizontal steel strands. For a single bundle of transverse steel strands, the pre-tension ratio is... The elongation of a single strand of transverse steel wire upon entering the yield state. The elongation of a single strand of transverse steel wire at the point of failure. g This is the acceleration due to gravity.

[0014] Preferably, the spacing between adjacent horizontal steel strands two satisfies the following relationship: in, D This refers to the number of horizontal steel strands (section 2) required to be laid per meter. The number of cross steel strands required to offset the impact energy. d The average particle size (m) of the boulders in the debris flow; Quantity of horizontal steel strand II The following relationship must be satisfied: in, v The impact velocity of debris flow rocks. Energy is absorbed in the two elastic stages of a single bundle of transverse steel strands. For single-strand transverse steel strands to absorb energy during the second plastic stage, To apply the initial prestress to the single strand of transverse steel strand two, The yield strength of a single bundle of transverse steel strands. l The length of the second single-bundle horizontal steel strand. For single-bundle horizontal steel strands with double pre-tensioning, The elongation of a single strand of transverse steel wire entering the yield state. It represents the elongation rate of a single strand of transverse steel wire at the point of failure.

[0015] This invention also provides a construction method for a flexible retaining and protective structure applicable to valley slope debris flows and high-altitude landslides, comprising the following steps: Step 1: Drill holes on the slope of the valley and place reverse prestressed anchor cable 2; drill holes in the valley and place reverse prestressed anchor cable 1. Step 2: Complete the binding of the ground beam reinforcement and concrete pouring along the arrangement direction of the second reverse prestressed anchor cable on the valley slope, and apply the prestress of the second reverse prestressed anchor cable along the second anchor cable hole set on the ground beam; complete the binding of the climbing beam reinforcement and concrete pouring along the arrangement direction of the first reverse prestressed anchor cable in the valley, and apply the prestress of the first reverse prestressed anchor cable along the first anchor cable hole set on the climbing beam. Step 3: Construct reinforced concrete support piles on the mountainside, and apply anchor cables to the sides of the support piles to connect them to the mountainside; Step 4: Prepare flexible transverse steel strands. Based on the actual mountain valley, connect transverse steel strand 2 to the climbing beam and apply prestress. Connect transverse steel strand 1 to the ground beam through support piles and apply prestress. Step 5: Prepare flexible vertical steel strands. The flexible vertical steel strands are connected to the horizontal steel strands 1 and 2 perpendicularly with clips to complete the construction of the barrier and protective net. Step six: The bottom of the retaining and protective netting is connected to the bottom of the mountain valley by pouring concrete structures.

[0016] Therefore, the present invention employs the above-mentioned flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls, which has the following beneficial effects: (1) The lower two sides of the barrier net of the present invention are connected to the mountain valley through climbing beams, and the bottom of the barrier net is connected to the bottom of the valley through a concrete structure, which can form a stable barrier protection structure in the valley; the upper part of the barrier net is connected to the mountain on the valley slope through support piles and ground beams, and the support piles are connected to the mountain through anchor cables in the longitudinal direction, which ensures that the barrier net has good overall stability while increasing the protection height. It can not only cope with the impact of falling rocks from high position, but also protect against debris flow, and has higher safety. (2) The flexible horizontal steel strands and flexible vertical steel strands of the barrier net of the present invention are both NPR steel strands, which have better toughness and ductility. The spacing between the adjacent flexible horizontal steel strands of the upper barrier net and the adjacent flexible horizontal steel strands of the lower barrier net is different, resulting in different density of the barrier net. The densely arranged lower barrier net can block small particles of debris flow at low level, while the sparsely arranged upper barrier net can block high-level high-energy rockfalls, thus providing more extensive protection.

[0017] (3) The flexible horizontal steel strands and flexible vertical steel strands on the barrier net of the present invention are connected by buckles at the vertical intersection, which facilitates installation and disassembly. Single or multiple strands of steel strands are easy to replace after damage. It is easy to repair and does not require replacement of the entire barrier net, resulting in lower maintenance costs.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of a flexible retaining and protection structure applicable to valley slope debris flows and high-altitude landslides and rockfalls according to the present invention. Figure 2 This is a schematic diagram of the front view of a portion of the protective structure of a flexible barrier and protection structure applicable to valley slope debris flows and high-altitude rockfalls according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the supporting pile structure of an embodiment of a flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls of the present invention. Figure 4 This is a schematic diagram of the cross-section of a climbing beam, representing an embodiment of a flexible retaining and protection structure applicable to valley slope debris flows and high-altitude landslides and rockfalls according to the present invention. Figure 5 This is a schematic elevation view of a climbing beam, representing an embodiment of a flexible retaining and protection structure for valley slope debris flows and high-altitude landslides and rockfalls according to the present invention.

[0020] Figure Labels 1. Barrier and protective netting; 2. Slope beam; 3. Support pile; 4. Ground beam; 5. Concrete structure; 6. Reverse prestressed anchor cable one; 7. Reverse prestressed anchor cable two; 8. Anchor cable hole one; 9. Anchor cable; 10. Horizontal steel strand one; 11. Horizontal steel strand two; 12. Flexible vertical steel strand; 13. Horizontal steel strand reserved hole. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "set," "install," and "connect" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example like Figure 1 As shown, the flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls of the present invention includes a retaining and protection net 1. The retaining and protection net 1 includes an upper retaining and protection net structure for retaining high-altitude rockfalls and a lower retaining and protection net structure for intercepting debris flow materials in the valley. Figure 3 , Figure 4 , Figure 5 As shown, the lower retaining net structure is connected to the gully on both sides by climbing beams 2. The climbing beams 2 are installed within the gully and connected to it via reverse prestressed anchor cables 6. This connection between the lower retaining net structure and the gully via the climbing beams 2 ensures a more secure connection. The reverse prestressed anchor cables 6 further stabilize the climbing beams 2 and the gully. The lower retaining net is connected to the bottom of the gully via a concrete structure 5, thus integrating the bottom of the lower retaining net structure with the gully, enhancing the stability and interception range of the lower retaining net structure.

[0024] like Figure 2 , Figure 3 As shown, the middle mesh structure of the upper retaining and protective netting structure is connected to the support piles 3. The sides of the support piles 3 are connected to the mountain through anchor cables 9. The bottom of the support piles 3 is connected to the mountain through pile foundations. Anchor cable holes 3 are provided on the sides of the support piles 3. One end of the anchor cable 9 is placed in the anchor cable hole 3, and the other end of the anchor cable 9 is anchored to the mountain. Figure 1As shown, the two side net structures of the upper retaining net, excluding the central net structure, are connected to the valley slope surface via ground beams 4. Ground beams 4 are installed on the mountain slope and connected to the mountain via reverse prestressed anchor cables 7. Both ground beams 4 and support piles 3 are made of reinforced concrete. The support piles 3 ensure a firm connection between the middle of the upper retaining net structure and the mountain, while the ground beams 4 ensure a firm connection between the two sides of the upper retaining net structure and the mountain, thus making the connection between the upper retaining net structure and the mountain more stable. The sides of the support piles 3 are connected to the mountain via anchor cables 9, strengthening the connection and greatly enhancing the stability of the upper retaining net structure. The installation of support piles 3 increases the height of the upper retaining net structure, enabling it to effectively protect against high-altitude landslides and rockfalls.

[0025] The bottom of the retaining net 1 is connected to the bottom of the valley via a concrete structure 5. The concrete structure 5 securely connects the bottom of the retaining net 1 to the valley floor, preventing debris flows from the bottom of the net 1 and improving its stability. The concrete structure 5 primarily uses reinforced concrete, but compared to conventional concrete dams, it is lower in height, requires less engineering work, has a lower cost, a shorter construction period, and is faster to build.

[0026] like Figure 2 As shown, the protective netting 1 includes several vertically intersecting flexible horizontal steel strands and flexible vertical steel strands 12. The vertical intersections of the flexible horizontal and vertical steel strands 12 are connected by clips. The clips consist of a clip body and a fastener. The clips utilize an existing structure, with the clip body and fastener connected by bolts. The clip body and fastener have non-overlapping vertical and horizontal grooves, perpendicular to each other. The clip body and fastener securely connect the vertical flexible horizontal steel strands and flexible vertical steel strands 12, improving the overall stability of the protective netting 1. The flexible horizontal steel strands include horizontal steel strand one 10 and horizontal steel strand two 11, with horizontal steel strand one 10 positioned above horizontal steel strand two 11. Horizontal steel strand two 11 is fixedly connected to the climbing beam 2. The climbing beam 2 has anchor cable holes one 8. One end of the reverse prestressed anchor cable one 6 is placed inside the anchor cable hole one 8, and the other end of the reverse prestressed anchor cable one 6 is anchored to the ditch. The horizontal steel strand 10 is fixedly connected to the ground beam 4 on both sides. Anchor cable holes 2 are provided on the ground beam 4. One end of the reverse prestressed anchor cable 7 is placed in the anchor cable hole 2, and the other end of the reverse prestressed anchor cable 7 is anchored to the mountain. The climbing beam 2 has reserved holes 13 for horizontal steel strands, and the horizontal steel strand 10 is placed in the reserved holes 13.

[0027] The spacing between adjacent horizontal steel strands 10 is greater than the spacing between adjacent horizontal steel strands 11, creating two different density levels in the retaining net 1. The densely arranged lower retaining net structure can block debris flow materials, while the sparsely arranged upper retaining net structure can block high-level, high-energy rockfalls, providing broader protection and enhancing overall protective capabilities.

[0028] The spacing between adjacent horizontal steel strands 10 satisfies the following relationship: in, The spacing between adjacent horizontal steel strands (10). The quantity of horizontal steel strand 10, V The equivalent volume of the collapsed rocks; Quantity of 10 horizontal steel strands The following relationship must be satisfied: in, M For the quality of the collapsed rocks, H The elevation difference between the location of the landslide and the point of contact between the landslide and the impact barrier netting 1. Work is done during the plastic stage of a single-bundle transverse steel strand (10). Work is done for the failure stage of the single-bundle transverse steel strand 10. To apply the initial preload to the single bundle of transverse steel strand 10, The yield critical force of a single strand of transverse steel wire (10). L The length of a single bundle of horizontal steel strand is 10. For single-bundle transverse steel strands with a pre-tension ratio of 10, The elongation of a single-strand transverse steel strand (10) entering the yield state. The elongation at failure of a single strand of transverse steel wire (10). g This is the acceleration due to gravity.

[0029] The spacing between adjacent horizontal steel strands 11 satisfies the following relationship: in, D This refers to the number of horizontal steel strands (211) required to be laid per meter. The number of horizontal steel strands required to offset the impact energy, d The average particle size (m) of the boulders in the debris flow; Quantity of horizontal steel strand 211 The following relationship must be satisfied: in, v The impact velocity of debris flow rocks. For single-strand transverse steel strands to absorb energy in the elastic stage 21, For single-strand transverse steel strands to absorb energy during the plastic stage, To apply the initial prestress to the single strand of transverse steel strand 211, The yield strength of a single strand of transverse steel wire 211. l The length of the single bundle of horizontal steel strand 211, For single-bundle transverse steel strands, the pre-tension ratio is 11. The elongation of a single-strand transverse steel strand (21) entering the yield state. It represents the elongation at failure of a single strand of transverse steel wire at point 11.

[0030] Both the flexible horizontal steel strands and the flexible vertical steel strands 12 are NPR steel strands, giving the retaining net 1 better elongation and stronger toughness. The spacing and quantity of the flexible horizontal and vertical steel strands 12 are arranged according to the actual mountain and valley terrain. The flexible horizontal and vertical steel strands 12 of the retaining net 1 can be disassembled and replaced individually; if damaged, the entire retaining structure does not need to be replaced, making maintenance convenient and cost-effective. The reverse prestressed anchor cable 16 and the reverse prestressed anchor cable 27 both use the same reverse prestressed anchor cable. The number of reverse prestressed anchor cables 16 and 27 is determined based on the required prestress calculation, and the installation angle of the reverse prestressed anchor cables 16 and 27 is set according to the actual mountain and valley terrain.

[0031] The present invention discloses a construction method for a flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls, comprising the following steps: Step 1: Drill holes on the slope of the valley and place reverse prestressed anchor cable 27; drill holes in the valley and place reverse prestressed anchor cable 16. Step 2: Complete the reinforcement binding and concrete pouring of the ground beam 4 along the arrangement direction of the reverse prestressed anchor cable 27 on the valley slope, and apply the prestress of the reverse prestressed anchor cable 27 along the anchor cable hole 2 set on the ground beam 4; complete the reinforcement binding and concrete pouring of the climbing beam 2 along the arrangement direction of the reverse prestressed anchor cable 16 in the valley, and apply the prestress of the reverse prestressed anchor cable 16 along the anchor cable hole 18 set on the climbing beam 2. Step 3: Construct reinforced concrete support piles 3 on the mountainside, and apply anchor cables 9 to the side of the support piles 3 to connect them to the mountainside; Step 4: Prepare flexible transverse steel strands. Based on the actual mountain valley, connect transverse steel strand 21 to the climbing beam 2 and apply prestress. Connect transverse steel strand 10 to the ground beam 4 through the support pile 3 and apply prestress. Step 5: Prepare flexible vertical steel strand 12. Flexible vertical steel strand 12 is connected to horizontal steel strand 10 and horizontal steel strand 2 11 by clips. The vertical connection completes the construction of the barrier and protection net 1. Step six: The bottom of the barrier net 1 is connected to the bottom of the mountain valley by pouring concrete structure 5.

[0032] In this embodiment, the lower two sides of the retaining net 1 are connected to the valley slope via climbing beams 2, and the bottom of the retaining net 1 is connected to the bottom of the valley via a concrete structure 5, forming a stable retaining structure within the valley. The upper part of the retaining net 1 is horizontally connected to the mountainside above the valley slope via support piles 3 and ground beams 4, and the support piles 3 are vertically connected to the mountainside via anchor cables 9, thereby improving the overall connection stability of the retaining net 1. The retaining net 1 uses flexible high-energy steel strands, breaking through the protection level of traditional retaining nets, with better ductility and higher safety. This allows it to simultaneously protect against high-altitude rockfalls and debris flows, achieving better protection effects and significantly reducing construction costs and manpower.

[0033] Therefore, the present invention adopts the above-mentioned flexible barrier protection structure applicable to valley slope debris flow and high-level landslides and rockfalls, which can simultaneously protect and block high-level landslides and debris flows on mountain valley slopes. The barrier protection net 1 is low in cost, strong in toughness and easy to maintain, based on high protection height and high protection level.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A flexible retaining and protective structure suitable for valley slope debris flows and high-altitude rockfalls, characterized in that: It includes a retaining and protective net, which includes an upper retaining and protective net structure for blocking high-level landslides and falling rocks and a lower retaining and protective net structure for intercepting debris flow materials in the gully. The two sides of the lower retaining and protective net structure are connected to the gully by climbing beams. The climbing beams are set in the gully and are connected to the gully by reverse prestressed anchor cables. The upper retaining and protective net structure is connected to the ground beam through support piles. The support piles are laterally connected to the mountain through anchor cables. The ground beam is set on the mountain slope and is connected to the mountain through reverse prestressed anchor cables. The bottom of the retaining and protective net is connected to the bottom of the mountain valley through a concrete structure. The retaining and protective net includes several flexible horizontal steel strands and flexible vertical steel strands that are set vertically. The perpendicular intersections of the flexible horizontal steel strands and the flexible vertical steel strands are connected by snaps. Both the flexible horizontal steel strands and the flexible vertical steel strands are NPR steel strands. The flexible horizontal steel strands include horizontal steel strand one and horizontal steel strand two. Horizontal steel strand one is set above horizontal steel strand two. The first set of horizontal steel strands and the flexible vertical steel strands, which are arranged vertically, constitute the upper barrier and protection net structure, while the second set of horizontal steel strands and the flexible vertical steel strands, which are arranged vertically, constitute the lower barrier and protection net structure. The spacing between adjacent horizontal steel strand 1 is greater than the spacing between adjacent horizontal steel strand 2; The spacing between adjacent horizontal steel strands two shall satisfy the following relationship: in, D This refers to the number of horizontal steel strands (section 2) required to be laid per meter. The number of cross steel strands required to offset the impact energy, d The average particle size of the rocks in the debris flow; Quantity of horizontal steel strand II The following relationship must be satisfied: in, v The impact velocity of debris flow rocks. Energy is absorbed in the two elastic stages of a single bundle of transverse steel strands. For single-strand transverse steel strands to absorb energy during the second plastic stage, To apply the initial prestress to the single strand of transverse steel strand two, The yield strength of a single bundle of transverse steel strands. l The length of the second single-bundle horizontal steel strand. For single-bundle horizontal steel strands with double pre-tensioning, The elongation of a single strand of transverse steel wire entering the yield state. It represents the elongation rate of a single strand of transverse steel wire at the point of failure.

2. The flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls according to claim 1, characterized in that: The second horizontal steel strand is fixedly connected to the climbing beam. An anchor cable hole one is provided on the climbing beam. One end of the first reverse prestressed anchor cable is placed in the first anchor cable hole one, and the other end of the first reverse prestressed anchor cable is anchored to the ditch.

3. The flexible retaining and protection structure applicable to valley slope debris flows and high-altitude rockfalls according to claim 2, characterized in that: The first horizontal steel strand is connected by support piles. Both sides of the first horizontal steel strand are connected to the valley slope through ground beams. Anchor cable holes are set on the ground beams. One end of the second reverse prestressed anchor cable is set in the second anchor cable hole, and the other end of the second reverse prestressed anchor cable is anchored to the mountain.

4. A flexible retaining and protective structure applicable to valley slope debris flows and high-altitude rockfalls according to claim 3, characterized in that: The bottom of the support pile is connected to the mountain through the pile foundation. An anchor cable hole three is set on the side of the support pile. One end of the anchor cable is set in the anchor cable hole three, and the other end of the anchor cable is anchored to the mountain.

5. A flexible retaining and protective structure for valley slope debris flows and high-altitude rockfalls as described in claim 4, characterized in that: The spacing between adjacent horizontal steel strands satisfies the following relationship: in, The spacing between adjacent horizontal steel strands. The quantity of the horizontal steel strands. V The equivalent volume of the collapsed rocks; Quantity of horizontal steel strand 1 The following relationship must be satisfied: in, M For the quality of the collapsed rocks, H The elevation difference between the location of the rockfall and the point of contact between the rockfall and the impact barrier. Work is done during the plastic stage of a single bundle of transverse steel strands. Work is done for the failure stage of a single bundle of transverse steel strands. To apply the initial preload to the single bundle of transverse steel strands, The yield critical force of a single strand of transverse steel wire. L The length of a single bundle of horizontal steel strands. For a single bundle of transverse steel strands, the pre-tension ratio is... The elongation of a single strand of transverse steel wire upon entering the yield state. The elongation of a single strand of transverse steel wire at the point of failure. g This is the acceleration due to gravity.

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