Flexible blocking and source fixing early warning structure suitable for narrow and steep debris flow prevention and control

Abstract

The invention discloses a flexible blocking solid source early warning structure suitable for narrow and steep debris flow prevention and control, and relates to the technical field of debris flow prevention and control. The structure is selectively arranged in a circulation area formed by debris flow, is reasonably combined and arranged from upstream to downstream according to the channel length and the longitudinal slope, and at least comprises four stages of flexible carbon fiber grating net structures and a counterfort type rubber dam. According to the flexible blocking and source fixing early warning structure suitable for narrow and steep debris flow prevention and control, the blocking and source fixing effects are achieved, early warning can be conducted in advance, the structure can bear high-strength impact of narrow and steep debris flow, impact loads are dispersed, damage of debris flow impact force to the blocking structure is greatly reduced, and the flexible blocking and source fixing early warning structure is light, green and convenient to use. According to the transportation and installation scheme, the construction period is short, the difficulty is low, debris flow disasters are accurately predicted, the problem that a steep debris flow prevention and control structure is prone to failure is solved, and the investment benefits of prevention and control measures are exerted to the maximum extent.

Description

Technical Field

[0001] This invention belongs to the field of debris flow prevention and control technology, and in particular relates to a flexible barrier and solidification early warning structure suitable for the prevention and control of narrow and steep debris flows. Background Technology

[0002] Debris flows are diverse in type, with varying formation and development conditions, and exhibit significantly different activity and hazard characteristics. The main characteristics of narrow and steep debris flows are: ① The drainage area is less than or equal to 5 square kilometers, the average longitudinal slope of the gully bed is greater than or equal to 300‰, the integrity coefficient of the drainage basin is less than or equal to 0.4, the planar shape is narrow and long, and the cross-sectional shape of the gully is mainly "V" shaped; ② The development environment is in the mid-to-high mountainous area with a drainage elevation difference of greater than or equal to 1000 meters, with well-developed faults and frequent neotectonic movements, and extremely rich sediment resources per unit area in the drainage basin; ③ The regional climate is humid, with concentrated heavy rainfall during the rainy season and a high frequency of outbreaks; ④ The debris flow is in the development stage, with vigorous activity and large scouring and deposition amplitude.

[0003] Narrow and steep debris flows are mostly found in high mountain canyons, distributed along the banks of rivers and their tributaries. They are characterized by deeply incised gullies, where landslides and other adverse geological hazards provide abundant material for their initiation. After heavy rainfall, the watershed rapidly converges into narrow and steep gullies, where debris flows cascade down. During this downward flow, high potential energy is converted into high kinetic energy, causing a sharp increase in velocity. Along its course, the flow continuously absorbs water and erodes, washes away, and scrapes away new solid material. The amount of solid material carried increases rapidly, with the size and impact force of the rocks increasing dramatically, and the energy also increasing continuously. Debris flows are highly susceptible to blockage and stagnation or rapid collapse and erosion within narrow gullies in a short period. The rapid changes in fluid flow cause significant pressure fluctuations within the gully, with instantaneous pressures exceeding normal pressures and causing destructive effects. This type of debris flow disaster generally causes fatal damage to the affected area.

[0004] Compared to the prevention and control of ordinary debris flow disasters, the prevention and control of narrow and steep debris flow disasters mainly presents the following difficulties: ① Constructing retaining dams to stabilize the debris source in narrow and steep gullies results in a short backfilling length and a small width-to-depth ratio, limiting the retention capacity and counter-pressure stabilization volume. Furthermore, once the reservoir is full, dredging is difficult, leading to a greater risk of debris flow overflow and dam collapse. Additionally, the gully banks are often characterized by loose, collapsed deposits, making it difficult to find suitable locations for large retaining dams. ② The steep longitudinal slope results in higher debris flow velocity and impact force, with high abrasion energy, causing severe structural damage to concrete dams and easily leading to instability of the dam shoulders and foundation. ③ Limited site conditions mean that the construction site lacks space for equipment transportation and layout, and there are construction safety risks such as collapse and rockfall due to vibration, making conventional prevention and control measures difficult to implement. ④ The gully topography is prone to change after heavy rainfall, increasing the risk of construction within the gully during the rainy season. This necessitates that all work from surveying to construction be completed during the dry season, significantly limiting the construction period.

[0005] Conventional debris flow disaster prevention and early warning technologies only monitor rainfall or sediment level changes at the gully mouth, resulting in insufficient accuracy and making them unsuitable for the prevention and early warning needs of narrow and steep debris flow disasters. Therefore, it is necessary to propose a novel retaining and solidifying structure that can stabilize the debris source, be constructed quickly, and allow for graded control of the flow capacity of solid materials in the debris flow, thereby reducing the impact on the retaining structure and addressing the challenges of concrete solid dams being prone to failure and having insufficiently accurate early warning systems. Summary of the Invention

[0006] The purpose of this invention is to provide a flexible barrier and source-prevention structure suitable for the prevention and control of narrow and steep debris flows. Through the structural design of carbon fiber flexible grid structure and buttress rubber dam, the construction period can be greatly shortened, investment can be saved, and the harm of narrow and steep debris flow disasters can be reduced.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: The present invention is a flexible barrier solid material source early warning structure suitable for the prevention and control of narrow and steep debris flows, comprising a carbon fiber flexible grid structure and a buttress rubber dam arranged in stages along the formation and flow zone of the debris flow longitudinal channel to the exit. At least one set of the carbon fiber flexible grid structure is set according to the longitudinal slope and length of the debris flow longitudinal channel; each set of the carbon fiber flexible grid structure consists of four levels of carbon fiber flexible grid structures, used for graded regulation of the flow rate of solid materials in the debris flow. The buttress rubber dam is located below the last level of the carbon fiber flexible grid structure. The aperture of the carbon fiber flexible grid structure is successively 2.0, 1.5, 1.0, and 0.5 times the average particle size of the debris flow; the buttress rubber dam includes a barrier net, an overflow port is provided above the barrier net, and an embedded pressure sensor is installed above the barrier net. The embedded pressure sensor is used to issue an early warning after the debris flow fills the barrier net.

[0008] In this embodiment of the invention, the horizontal spacing between two adjacent levels of the carbon fiber flexible grid structure is 1.5 times its longitudinal height difference, and the height of each level of the carbon fiber flexible grid structure is less than 5 meters.

[0009] In this embodiment of the invention, the carbon fiber flexible grid structure is composed of transverse anchors, longitudinal anchors, transverse carbon fiber ropes, longitudinal carbon fiber ropes and flexible connecting buckles. The transverse carbon fiber ropes are fixed in the stable bedrock of the slopes on both sides of the debris flow channel by transverse anchors, and the longitudinal carbon fiber ropes are fixed in the stable bedrock at the bottom of the debris flow channel by longitudinal anchors.

[0010] In this embodiment of the invention, the diameter of both the transverse anchor and the longitudinal anchor is 28 mm, and the angle between the transverse anchor and the longitudinal anchor and the horizontal plane is 15°. The transverse anchor is connected to the transverse carbon fiber rope by bending, and the longitudinal anchor is connected to the longitudinal carbon fiber rope by bending.

[0011] In this embodiment of the invention, both the transverse carbon fiber rope and the longitudinal carbon fiber rope have a tensile strength of over 3000 MPa and a density of 1.5-1.6 g / cm³. 3 High-strength, lightweight, corrosion-resistant, and fatigue-resistant carbon fiber rope with a bending resistance exceeding 100 times.

[0012] In this embodiment of the invention, the carbon fiber flexible grid structure adjusts the mesh size by adjusting the spacing between the horizontal and vertical anchor bolts driven into the bedrock, thereby controlling the particle size of the flowing rocks in the debris flow. After being filled with silt, the carbon fiber flexible grid structure can reduce the longitudinal slope of the valley and play a role in stabilizing the bank slope and the initiation of material sources at the bottom of the gully.

[0013] In this embodiment of the invention, the buttress rubber dam further includes steel pipe piles, connecting beams, a buttress rubber dam body, and a barrier net; the steel pipe piles are embedded in the bedrock at the bottom of the longitudinal channel of the debris flow, and the top of the steel pipe piles is embedded in the connecting beam to a depth of 0.8m, and the connecting beam is cast from polypropylene plastic fiber.

[0014] In this embodiment of the invention, the buttress rubber dam body is fixedly installed on the top of the connecting beam, the barrier net is fixedly installed between the two buttress structures, and its aperture is 0.5 times the particle size of the debris flow solids. The buttress structure is narrow at the top and wide at the bottom. The embedded pressure sensor is installed on the top of the barrier net, and the embedded pressure sensor triggers an early warning by sensing the pressure of the debris flow material accumulated in front of the barrier net.

[0015] The present invention has the following beneficial effects:

[0016] 1. This invention combines a high-strength flexible grid structure with a buttress rubber dam. Both the high-strength flexible grid structure and the buttress rubber dam are lightweight, easy to assemble, and quick to construct. By controlling the flow particle size of solid materials in debris flow through a multi-stage high-strength flexible grid structure, the impact force of large debris flow rocks on the downstream buttress rubber dam is gradually reduced, thereby improving the service life of the retaining structure.

[0017] 2. The retaining and solidifying structure in this invention uses anchor bolts to fix the grid structure to the ditch. The anchor bolts can be installed separately. The buttress rubber dam can be designed according to the cross-sectional structure of the ditch and assembled in advance outside the construction site, which greatly improves construction efficiency and reduces construction safety risks.

[0018] 3. The high-strength flexible grid structure of this invention can mitigate the longitudinal slope after siltation, playing a role in stabilizing the source of debris flow in the channel. The retaining and stabilizing structure is fixed to the stable bedrock on both sides of the bank and the bottom of the gully by anchor bolts. The excavation of earth and rock is greatly reduced during the entire construction process, and the amount of loose material in the gully is also greatly reduced, thus reducing the harm of narrow and steep debris flows. After the grid is silted up, the buckles and the joints between the anchor bolts and the longitudinal and transverse carbon fiber ropes can be released to achieve automatic silt removal, avoiding the risk of the retaining dam overflowing and collapsing. It can play a role again in the event of the next debris flow.

[0019] 4. When the rubber dam structure of this invention is subjected to the impact of debris flow boulders, the rubber layer deforms first to absorb the impact kinetic energy. Under the compression, the rubber structure generates a violent friction and fragmentation effect, which can reduce the impact force by up to 35%. At the same time, the rubber structure also has unique self-healing characteristics. The rubber structure can be reused with only routine maintenance. By connecting the steel pipe piles and the connecting beams into one unit, the stability of the entire structure is greatly improved and the stability of the dam foundation is strengthened.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

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

[0022] Figure 1 This is a spatial layout diagram of the flexible barrier solid source early warning structure applicable to the prevention and control of narrow and steep debris flows in this invention.

[0023] Figure 2 This is a structural layout diagram of the carbon fiber flexible grid structure in this invention.

[0024] Figure 3 This is a partial structural diagram of the buttress-type rubber dam in this invention.

[0025] Figure 4 This is a side view of the buttress-type rubber dam in this invention.

[0026] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0027] 1-Longitudinal debris flow channel, 2-Fiber carbon fiber flexible grid structure, 3-Buttress rubber dam, 4-Barrier net, 5-Overflow outlet, 6-Transverse anchor bolt, 7-Longitudinal anchor bolt, 8-Transverse carbon fiber rope, 9-Longitudinal carbon fiber rope, 10-Flexible connecting buckle, 11-Transverse debris flow channel, 12-Steel pipe pile, 13-Connecting beam, 14-Buttress rubber dam body. Detailed Implementation

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Please see Figure 1-4 This invention relates to a flexible barrier and solid material source warning structure suitable for the prevention and control of narrow and steep debris flows. It includes a carbon fiber flexible grid structure 2 arranged in stages from the formation and flow zone of the debris flow longitudinal channel 1 to the exit point, and a buttress-type rubber dam 3. The carbon fiber flexible grid structure 2 is arranged in at least one set according to the longitudinal slope and length of the debris flow longitudinal channel 1. Each set of the carbon fiber flexible grid structure 2 consists of four levels of carbon fiber flexible grid structures 2, used to grade and regulate the flow rate of solid materials in the debris flow, gradually reducing the flow velocity and impact force of the debris flow. The buttress-type... The rubber dam 3 is located below the last stage of the carbon fiber flexible grid structure 2. The distance between the buttress rubber dam 3 and the adjacent carbon fiber flexible grid structure 2 is 200 meters. The aperture of the carbon fiber flexible grid structure 2 is successively 2.0, 1.5, 1.0 and 0.5 times the average particle size of the debris flow. The buttress rubber dam 3 includes a barrier net 4. An overflow port 5 is provided above the barrier net 4. An embedded pressure sensor is installed above the barrier net 4. The embedded pressure sensor is used to issue an early warning after the debris flow fills the barrier net 4.

[0030] The spacing between the two-stage carbon fiber flexible grid structure 2 is typically:

[0031] L = H / (I - I0)

[0032] In the formula, L is the distance between dams (m);

[0033] I—Original ditch slope, (%);

[0034] I0—For ditches with regular water flow, I0≈0.5I; for ditches without regular water flow, I0≈0.75I.

[0035] The retaining and solidifying structure in this embodiment can be designed according to the cross section of the ditch. The buttress rubber dam 3 can be assembled outside the construction site and polypropylene plastic fiber can be poured on site, which greatly reduces the construction risk and greatly improves the construction efficiency. It can maximize the benefits of the project construction investment and achieve the best cost-effectiveness. Moreover, the cost of the carbon fiber flexible grid structure 2 is lower than that of the buttress rubber dam 3.

[0036] In this embodiment of the invention, the horizontal spacing between two adjacent levels of the carbon fiber flexible grid structure 2 is 1.5 times its longitudinal height difference, and the height of each level of the carbon fiber flexible grid structure 2 is less than 5 meters. The carbon fiber flexible grid structure 2 is composed of transverse anchors 6, longitudinal anchors 7, transverse carbon fiber ropes 8, longitudinal carbon fiber ropes 9, and flexible connecting buckles 10. The transverse carbon fiber ropes 8 are fixed to the stable bedrock on both sides of the debris flow transverse channel 11 by the transverse anchors 6, and the longitudinal carbon fiber ropes 9 are fixed to the stable bedrock at the bottom of the debris flow transverse channel 11 by the longitudinal anchors 7. The transverse anchors 6 and longitudinal anchors 7 can be constructed simultaneously, which greatly improves the construction efficiency. The transverse anchors 6 and longitudinal anchors 7 can be driven into the stable bedrock, which not only reduces the excavation of the bottom of the channel and the rock slopes on both sides, but also the anchors play a role in reinforcing the banks and the bottom of the channel, greatly reducing the amount of loose solid material and suppressing the erosion of the banks and the bottom of the channel by the debris flow.

[0037] In this embodiment, the carbon fiber flexible grid structure 2 can adjust the flow of debris flow solids by varying the number of transverse carbon fiber ropes 8 and longitudinal carbon fiber ropes 9, based on the particle size of the debris flow solids. This allows the debris flow solids to pass through in stages, achieving graded control of flow capacity. Longitudinal anchors 7 are driven into the bedrock at the bottom of the gully to reinforce the gully and prevent the initiation of debris flow. The carbon fiber flexible grid structure 2 must be used in groups of four, forming a cluster of silt-filled sections to stabilize the debris flow. After the debris flow has filled the gully, the connections between the transverse carbon fiber ropes 8 and longitudinal carbon fiber ropes 9 and the anchors can be loosened, creating favorable conditions for dredging. This addresses the previous problem of solid dams becoming ineffective after siltation and being prone to collapse.

[0038] In this embodiment of the invention, the diameters of both the transverse anchor 6 and the longitudinal anchor 7 are 28 mm, and the angles between both the transverse anchor 6 and the longitudinal anchor 7 and the horizontal plane are 15°. The transverse anchor 6 is connected to the transverse carbon fiber rope 8 by bending, and the longitudinal anchor 7 is connected to the longitudinal carbon fiber rope 9 by bending. Both the transverse carbon fiber rope 8 and the longitudinal carbon fiber rope 9 have a tensile strength of over 3000 MPa and a density of 1.5-1.6 g / cm³. 3The carbon fiber rope is a high-strength, lightweight, corrosion-resistant, and fatigue-resistant material with a bending resistance exceeding 100 times. The transverse carbon fiber rope 8 and the longitudinal carbon fiber rope 9 are also high-strength, flexible, round carbon fiber ropes that can adapt to a temperature range of -20℃ to 40℃.

[0039] In this embodiment of the invention, the carbon fiber flexible grid structure 2 adjusts the mesh size by adjusting the spacing between the transverse anchors 6 and the longitudinal anchors 7 driven into the bedrock, thereby controlling the particle size of the flowing rocks in the debris flow. After silting up, the carbon fiber flexible grid structure 2 forms a valley dam, and the four-stage carbon fiber flexible grid structure 2 creates a stepped control, mitigating the longitudinal slope of the valley and stabilizing the banks and the bottom of the gully. During the dry season, the transverse carbon fiber ropes 8 and the longitudinal carbon fiber ropes 9 can be opened to clear the silted reservoir, allowing the carbon fiber flexible grid structure 2 to function again during the next debris flow.

[0040] In this embodiment of the invention, the buttress rubber dam 3 further includes steel pipe piles 12, connecting beams 13, a buttress rubber dam body 14, and a barrier net 4; the steel pipe piles 12 are embedded in the bedrock at the bottom of the longitudinal debris flow channel 1, and the top of the steel pipe piles 12 is embedded in the connecting beams 13 to a depth of 0.8m, the connecting beams 13 being cast from polypropylene plastic fibers; the buttress rubber dam body 14 is fixedly installed on the top of the connecting beams 13, the barrier net 4 is fixedly installed between two buttress rubber dams 14 by bolts, its aperture being 0.5 times the particle size of the debris flow solids, the buttress rubber dam body 14 is fixedly installed on the connecting beams 13, it has a structure that is narrow at the top and wide at the bottom, an embedded pressure sensor is installed on the top of the barrier net 4, and the embedded pressure sensor triggers an early warning by sensing the pressure of the debris flow material accumulated in front of the barrier net 4.

[0041] By installing an embedded pressure sensor at the top of the retaining net 4 of the buttress rubber dam 3, when the pressure reaches a stable value, it indicates that the retaining net 4 is filled with debris flow solid material, triggering the embedded pressure sensor to issue an early warning. Traditional debris flow early warning systems monitor mud level and rainfall, and the early warning devices are generally installed in the debris flow deposition area. Due to the different rainfall thresholds for debris flows in different channels, the false alarm rate is high and the warning time is short. This application issues an early warning after the debris flow fills the retaining net 4, avoiding the risk of dam failure. It provides an early warning before the debris flow reaches the deposition area, greatly extending the warning time. It also indicates that the rubber dam is full and the reservoir needs to be emptied. At this time, the bolts connecting the retaining net 4 to the buttress rubber dam body 14 can be opened to release the reservoir capacity.

[0042] In this embodiment, the steel pipe piles 12 downstream of the buttress rubber dam 3 are arranged in a quincunx pattern, with three rows spaced 0.8m apart and 1.5m apart. The first row of steel pipe piles 12 upstream is vertical, while the second and third rows of steel pipe piles 12 form an angle of 15° with the vertical direction. The steel pipe piles 12 are characterized by rapid construction and are often used in emergency rescue and disaster prevention. This construction method greatly reduces the excavation of the foundation. The buttress rubber dam body 14 and the inclined steel pipe pile 12 structure increase the stability of the dam foundation.

[0043] In this embodiment, the diameter of the pile hole for the steel pipe pile 12 is Φ150, and a Φ108 steel pipe with a wall thickness of 8mm is inserted inside. Two Φ25 steel bars are installed inside the steel pipe, and the top of the steel bars is embedded in the buttress-type rubber dam body 14. After the steel pipe is prefabricated, C30 cement mortar is poured in. A connecting beam 13 is set on the top of the steel pipe pile 12, which is cast from polypropylene plastic fiber. The steel pipe pile 12 extends 0.8m into the connecting beam.

[0044] In this embodiment, the buttress rubber dam 3 is designed according to the cross-sectional shape of the debris flow channel. After being assembled off-site, it is transported to the channel. The rubber is embedded in the connecting beam 13, and the connecting beam 13 and the buttress rubber dam body 14 form a stable whole. The connecting beam 13 is equipped with steel bars and is tied to the steel pipe pile 12 to form a whole. The buttress rubber dam 3 in this embodiment has a lightweight structure. It is designed according to the cross-sectional shape of the channel and assembled off-site, which reduces the excavation of the bank slope and the bottom of the channel. It can solve the problems of construction efficiency and construction safety risks of large-scale excavation of the foundation and abutment of conventional concrete retaining dams.

[0045] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible barrier and solid-source early warning structure suitable for the prevention and control of narrow and steep debris flows, characterized in that, The carbon fiber flexible grid structure (2) and the buttress rubber dam (3) are arranged in stages from the formation flow area to the exit of the debris flow longitudinal channel (1). The carbon fiber flexible grid structure (2) is set up in at least one set according to the longitudinal slope and length of the debris flow longitudinal channel (1). Each group of the carbon fiber flexible grid structure (2) consists of four levels of carbon fiber flexible grid structures (2) for graded regulation of the flow rate of solid materials in debris flow. The buttress rubber dam (3) is set on the lower side of the last level of carbon fiber flexible grid structure (2). The aperture of the carbon fiber flexible grid structure (2) is 2.0, 1.5, 1.0 and 0.5 times the average particle size of debris flow, respectively. The buttress rubber dam (3) includes a barrier net (4), an overflow port (5) is provided above the barrier net (4), and an embedded pressure sensor is installed above the barrier net (4) at the position corresponding to the overflow port (5). The embedded pressure sensor is used to issue an early warning after the debris flow fills the barrier net (4).

2. The flexible barrier and solid-source early warning structure for preventing and controlling narrow and steep debris flows according to claim 1, characterized in that, The horizontal spacing between two adjacent carbon fiber flexible grid structures (2) is 1.5 times their longitudinal height difference, and the height of each carbon fiber flexible grid structure (2) is less than 5 meters.

3. A flexible barrier and solid-source early warning structure suitable for preventing and controlling narrow and steep debris flows according to claim 1, characterized in that, The carbon fiber flexible grid structure (2) consists of a transverse anchor (6), a longitudinal anchor (7), a transverse carbon fiber rope (8), a longitudinal carbon fiber rope (9), and a flexible connecting buckle (10). The transverse carbon fiber rope (8) is fixed to the stable bedrock on both sides of the debris flow transverse channel (11) by the transverse anchor (6), and the longitudinal carbon fiber rope (9) is fixed to the stable bedrock at the bottom of the debris flow transverse channel (11) by the longitudinal anchor (7).

4. A flexible barrier and solid-source early warning structure suitable for preventing and controlling narrow and steep debris flows according to claim 3, characterized in that, The diameter of the transverse anchor (6) and the longitudinal anchor (7) is 28 mm, and the angle between the transverse anchor (6) and the horizontal plane is 15°. The transverse anchor (6) is connected to the transverse carbon fiber rope (8) by bending. The longitudinal anchor (7) is vertically fixed in the bedrock of the ditch and is bent at the bottom of the ditch to connect with the longitudinal carbon fiber rope (9).

5. A flexible barrier and solid-source early warning structure suitable for preventing and controlling narrow and steep debris flows according to claim 3, characterized in that, Both the transverse carbon fiber rope (8) and the longitudinal carbon fiber rope (9) have a tensile strength of over 3000 MPa and a density of 1.5-1.6 g / cm³. 3 High-strength, lightweight, corrosion-resistant, and fatigue-resistant carbon fiber rope with a bending resistance exceeding 100 times.

6. A flexible barrier and solid-source early warning structure suitable for preventing and controlling narrow and steep debris flows according to claim 3, characterized in that, The carbon fiber flexible grid structure (2) adjusts the mesh size by adjusting the spacing between the horizontal anchor rods (6) and the longitudinal anchor rods (7) driven into the bedrock, and controls the particle size of the flowing rocks in the debris flow by adjusting the mesh size; the carbon fiber flexible grid structure (2) plays a role in reducing the longitudinal slope of the gully and preventing the initiation of material sources at the bottom of the gully after it is filled with silt.

7. A flexible barrier and solid-source early warning structure suitable for preventing and controlling narrow and steep debris flows according to claim 1, characterized in that, The buttress rubber dam (3) also includes steel pipe piles (12), connecting beams (13), barrier nets (4) and buttress rubber dam body (14); the steel pipe piles (12) are embedded in the bedrock at the bottom of the longitudinal debris flow channel (1), and the top of the steel pipe piles (12) is embedded in the connecting beams (13) to a depth of 0.8m. The connecting beams (13) are made of polypropylene plastic fibers.

8. A flexible barrier and solid-source early warning structure suitable for preventing and controlling narrow and steep debris flows according to claim 7, characterized in that, The buttress rubber dam body (14) is fixedly installed on the top of the connecting beam (13). The barrier net (4) is fixed between the two buttress rubber dam bodies (14). The aperture of the barrier net (4) is 0.5 times the average particle size of the debris flow solid material. The buttress rubber dam body (14) has a structure that is narrow at the top and wide at the bottom. The embedded pressure sensor is installed on the top of the barrier net (4). The embedded pressure sensor triggers an early warning by sensing the pressure of the debris flow material accumulated in front of the barrier net (4).

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