Burst retarding and peak clipping system for barrier dam

Abstract

The utility model discloses a dam collapse retarding and peak clipping system which comprises a sluice channel, a sluice channel, a sluice channel body, a sluice channel body, a sluice channel body, a sluice channel body, a sluice channel body, a sluice channel body, a sluice channel body, a sluice channel body and a sluice channel body. The bruise prevention net is installed on the top portion of the barrier dam and the downstream slope face of the barrier dam, the bruise prevention net comprises bruise prevention sandbags and a stone blocking net, and the bruise prevention sandbags and the stone blocking net form a net structure. The size of the sluice channel is determined according to the site construction capability, and excavation is more reasonable. The collapse-preventing sandbag can fully utilize waste residues generated after a sluice channel is excavated on site, materials are taken on site, the transportation cost is reduced, and a large amount of time is saved; the stone blocking net can effectively block large stones, the dam body is prevented from cutting down rapidly, and then the flood peak is effectively reduced. And the barbed steel wires are adopted to wind the iron chains and the jute bags, so that the frictional resistance with the dam body can be effectively increased, and collapse resistance can be better carried out.

Description

Technical Field

[0001] The utility model belongs to the technical field of spillways in landslide dams, and in particular relates to a landslide dam collapse mitigation and peak cutting system. Background Art

[0002] Due to the sudden and dangerous nature of landslide dams, the current solution for landslide dams primarily relies on excavating spillways. While these can effectively reduce reservoir capacity, other factors, such as the depth of the spillway, improper slope protection and location, and the presence of boulders at the bottom of the spillway, can still result in large discharges in the event of a landslide dam failure. Therefore, there is an urgent need to develop a technology that can effectively mitigate and reduce the peak of a landslide dam's failure. Summary of the Invention

[0003] In order to solve the above problems, the utility model proposes a landslide dam collapse mitigation and peak cutting system.

[0004] The utility model provides a landslide dam burst mitigation and peak cutting system, comprising: a spillway, which is a trapezoidal spillway, the size of which is calculated based on the DABA model and the actual allowable excavation volume; a burst prevention net, which is installed on the top of the landslide dam and the downstream slope of the landslide dam, and the burst prevention net comprises burst prevention sandbags and stone-blocking nets, which are alternately arranged.

[0005] The collapse-blocking sandbags are of V-shaped prism structure, with both side edges and bottom edges of the collapse-blocking sandbags connected to barbed iron chains. Multiple collapse-blocking sandbags and multiple barbed iron chains are combined into a sandbag net, which is a rectangular mesh structure. There are at least two collapse-blocking sandbags on each side of the sandbag net, and there are barbed iron chains between adjacent two collapse-blocking sandbags in the sandbag net. The distance between adjacent two collapse-blocking sandbags is 5-10m.

[0006] The sandbag net is also provided with a stone retaining net, the width of which matches the width of the sandbag net. The stone retaining net is arranged parallel to the edge of the sandbag net containing the collapse-blocking sandbags, and the stone retaining net faces upstream of the dam body.

[0007] The collapse-resistant sandbag is made by wrapping barbed steel wire around the outside of a sack, and soil and stone materials excavated from the spillway are placed inside the collapse-resistant sandbag. The edges of the sack opening are tied with steel wire.

[0008] The barbed iron chain is formed by winding an iron chain and a barbed steel wire, and the iron chain is formed by interlocking a plurality of oval iron rings in pairs.

[0009] The two ends of the rock-blocking net are slidably mounted on steel rods. The steel rods are grooved hollow rods. The ends of the rock-blocking net are connected to the steel rods through connectors and rollers.

[0010] The connecting piece is a plate-like structure, which is located in the groove of the steel rod. Two rollers are installed at intervals on one side of the connecting piece, and a clamping block is fixed in the middle of the other side, which is fixedly connected to the stone retaining net.

[0011] A plurality of circular through holes are distributed on the lower side surface of the steel rod.

[0012] The barbed iron chain at the end of the sandbag net is fixed at the junction of the barrier dam and the side bank slope through an anchor cable.

[0013] A reel is fixed on the top end of the anchor cable, and a barbed iron chain is wound around the reel.

[0014] The beneficial effects of the present utility model are:

[0015] 1. The size of the spillway of the utility model is calculated based on the DABA model and the actual allowable excavation volume, that is, the size of the spillway is formulated according to the on-site construction capacity. Compared with the existing spillway excavation technology, the excavation is more reasonable.

[0016] 2. The anti-break sandbags can make full use of the waste residue left after the spillway is excavated on site, obtain materials on site, reduce transportation costs, and save a lot of time; the rock net can effectively block large stones, prevent the dam body from being cut down quickly, and thus effectively reduce the flood peak.

[0017] 3. The size of the anti-break net device fully considers the changes in the dam body size caused by the collapse, and can fully play the role of mitigating the collapse and reducing the peak.

[0018] 4. Using barbed wire wrapped around iron chains and sacks can effectively increase the frictional resistance with the dam body and better prevent collapse.

[0019] 5. There are circular through holes on the side of the hollow steel rods connected to the rock retaining net, which helps the injected slurry to spread into the rock and soil, forming blocks to increase the anti-scouring ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 are the shape parameters of the spillway and the dam body.

[0021] Figure 2 It is a structural schematic diagram of the collapse-blocking net of the present utility model.

[0022] Figure 3 It is a structural schematic diagram of the steel rod of the present utility model.

[0023] Figure 4 It is a top view of the steel rod of the present invention.

[0024] Figure 5 It is a schematic diagram of the internal connecting piece of the steel rod of the present invention.

[0025] Figure 6It is a schematic diagram of the arrangement of the anchor rope and the reel of the utility model.

[0026] Reference numerals:

[0027] Sandbags 1; barbed iron chains 2; rock-blocking nets 3; steel rods 4; through holes 5; connectors 6; rollers 7; blocks 8; bolts 9; anchor cables 10; and reels 11. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] like Figures 1-6 As shown, the landslide dam burst mitigation and peak cutting system of the present invention includes: a spillway and a burst prevention net. The spillway is a trapezoidal spillway, and the size of the spillway is calculated based on the DABA model and the actual allowable excavation volume; the size of the spillway is mainly calculated through numerical simulation to obtain the optimal trapezoidal spillway size that can minimize the dam burst peak flow.

[0030] The parameters of the trapezoidal spillway include the depth of the spillway, the width of the bottom of the spillway and the excavation slope of the spillway side slope.

[0031] The actual allowable excavation volume is calculated based on the emergency response time and mechanical excavation efficiency. T Through the reservoir capacity of the barrier lake V l and inflow Q in Calculated ( T = V l / Q in ).

[0032] The collapse prevention net is installed at the top of the landslide dam and on the downstream slope of the dam. It consists of sandbags 1 and rock-blocking nets 3, which are arranged alternately to form a mesh structure. The rock-blocking nets 3 are fixed to the dam body by steel rods 4, while the sandbags 1 are fixed to the intersection of the landslide dam and the side bank slope by anchor cables 10.

[0033] The anti-break sandbags 1 are V-shaped prisms with their openings facing upstream of the dam. This V-shaped prism structure can significantly reduce scouring caused by a dam failure. Barbed chains 2 are attached to both sides and the bottom of the anti-break sandbags 1. Multiple anti-break sandbags 1 and these chains 2 form a sandbag net. The net is a rectangular mesh structure with at least two anti-break sandbags on each side. Adjacent sandbags 1 in the net are separated by a barbed chain 2, with a spacing of 5-10 meters between them.

[0034] Interspersed within the sandbag network are rock-blocking nets 3, whose width matches the width of the sandbag network. These nets are placed alternately with the anti-break sandbags 1, parallel to the edges of the sandbag network containing the anti-break sandbags. The rock-blocking nets face upstream of the dam, effectively blocking large rocks and preventing rapid undercutting of the dam. The anti-break sandbags 1 are also staggered to ensure a greater degree of anti-break effect.

[0035] The collapse-blocking sandbags 1 are made by wrapping barbed wire around burlap sacks. Earth and rock excavated from the spillway are placed inside the bags, and the edges of the bags are tied with wire. Using burlap sacks wrapped with barbed wire reduces production costs and makes material more readily available. The barbed wire also increases friction between the bags and the dam, improving scour resistance.

[0036] The barbed iron chain 2 is made of an iron chain and barbed wire, and the iron chain is made of a plurality of oval iron rings interlocked in pairs. The use of the barbed iron chain 2 can increase the contact between the collapse prevention net and the dam body, increase the friction resistance between the net and the dam body material, and thus improve the anti-scour performance.

[0037] The rock retaining net 3 adopts steel-plastic geogrid, and the mesh size is the median particle size of the dam material.

[0038] The two ends of the rock-blocking net 3 are slidably mounted on the steel rod 4 . The steel rod 4 is a grooved hollow rod. The ends of the rock-blocking net 3 are connected to the steel rod 4 through a connector 6 and a roller 7 .

[0039] The connecting member 6 is a plate-like structure, which is located in the groove of the steel rod 4. Two rollers 7 are installed at intervals on one side of the connecting member 6, and a clamping block 8 is fixed in the middle of the other side. The clamping block 8 is fixedly connected to the rock-blocking net 3. Specifically, the clamping block 8 is connected to the rock-blocking net 3 by bolts.

[0040] Both ends of the rock-blocking net 3 are slidably mounted on the steel rod 4. Specifically, as the dam body is scoured, the rock-blocking net 3 gradually moves downward along the steel rod 4 along with the roller 7, ensuring that it fits the slope of the dam body.

[0041] The lower side of the steel rod 4 is provided with multiple circular through-holes 5. The top of the steel rod 4 is opened, allowing grouting liquid to be injected through the upper end of the rod. The grouting liquid then diffuses into the dam body through the circular through-holes 5 at the lower end of the rod, forming a bulk that increases scour resistance. After grouting, the liquid diffuses through the holes in the rod into the dam material, cementing the material within a certain area and helping to strengthen the dam. The rod does not need to be removed later.

[0042] A reel 11 is fixed to the top of the anchor cable 10, and a barbed iron chain 2 is wound around it. The barbed iron chain 2 on the reel 11 is connected to the barbed iron chain 2 in the sandbag net. As the scouring of the dam body decreases, the barbed iron chain 2 is released from the reel 11, ensuring that the collapse prevention net device is always in contact with the dam body, which can effectively prevent collapse.

[0043] The barbed iron chain 2 at the end of the sandbag net is connected to the junction of the landslide dam and the side bank slope through the anchor cable 10. When the dam bursts, the barbed iron chain can be recovered by the reel 11, which can protect the environment and save resources.

[0044] Furthermore, the collapse-preventing net device installed on the slope of the dam top has a reel with a barbed iron chain with a total length equal to the sum of the dam length and height, which can effectively ensure that the collapse-preventing net fits the dam body during the dam burst process.

[0045] Furthermore, the collapse-preventing net device installed on the downstream slope of the dam body has a reel with a barbed iron chain with a total length equal to the sum of the dam length and height, which can effectively ensure that the collapse-preventing net fits the dam body during the dam burst process.

[0046] Example

[0047] A landslide formed a dam in a remote mountain river, with an upstream inflow of 1000 m 3 / s, the maximum storage capacity is 2×10 9 m 3 The dam body is made of crushed stone soil. The dam body dimensions are as follows: dam height 60 m, dam top length 250 m, dam top width 350 m, dam bottom length along the river 1500 m, downstream dam slope length 500 m, slope of about 15°, on-site excavator construction efficiency 2000 m 3 As the upstream barrier lake gradually accumulates water, the barrier dam is prone to collapse and cause floods, requiring emergency response to mitigate the impact of the dam collapse.

[0048] The actual allowable excavation volume is calculated based on the emergency response time and mechanical excavation efficiency. T Through the reservoir capacity of the barrier lake V l and inflow Q in Calculated ( T = V l / Q in According to the assumed landslide dam conditions, the emergency response time is 23 days, and the actual allowable excavation volume is 46,000 m 3 .

[0049] The dimensions of the trapezoidal trough include the trough depth, trough bottom width and the excavation slope of the trough side slope. The actual allowable excavation volume has been obtained to be 46,000 m 3 Assuming that the slope along the river channel is 0°, the numerical simulation adopts the DABA model proposed by Chang Dongsheng et al., and the optimal spillway dimensions can be obtained as follows: the trough depth is 9 m, the trough bottom width is 35 m, and the excavation slope of the spillway side slope is 30°.

[0050] Specifically, the spacing between the collapse-blocking sandbags is 5m.

[0051] Furthermore, the collapse-preventing net is installed on the dam top slope and downstream of the dam body. The total length of the barbed iron chain of the reel of the collapse-preventing net device installed on the dam top slope is the sum of the dam length and dam height, 310m.

[0052] Furthermore, the collapse prevention net device installed on the downstream slope of the dam body has a total length of barbed iron chain on its reel that is the sum of the dam length and height, 310m.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0054] In addition, in the description of the present invention, “a plurality of” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0057] In the present invention, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0058] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present invention.

Claims

1. A landslide dam collapse mitigation and peak cutting system, characterized in that: include: The discharge trough is a trapezoidal discharge trough, and the size of the discharge trough is calculated according to the DABA model and the actual allowable excavation volume; The collapse-preventing net is installed on the top of the landslide dam and the downstream slope of the landslide dam. The collapse-preventing net includes collapse-preventing sandbags and stone-blocking nets, which are alternately arranged.

2. The landslide dam collapse mitigation and peak cutting system according to claim 1, characterized in that: The collapse-blocking sandbags are of V-shaped prism structure, with both side edges and bottom edges of the collapse-blocking sandbags connected to barbed iron chains. Multiple collapse-blocking sandbags and multiple barbed iron chains are combined into a sandbag net, which is a rectangular mesh structure. There are at least two collapse-blocking sandbags on each side of the sandbag net, and there are barbed iron chains between adjacent two collapse-blocking sandbags in the sandbag net. The distance between adjacent two collapse-blocking sandbags is 5-10m.

3. The landslide dam collapse mitigation and peak cutting system according to claim 2, characterized in that: The sandbag net is interspersed with stone-blocking nets, the width of which matches the width of the sandbag net. The stone-blocking nets are arranged parallel to the edges of the sandbag nets containing the collapse-blocking sandbags, and the stone-blocking nets face upstream of the dam body.

4. The landslide dam collapse mitigation and peak cutting system according to claim 3, characterized in that: The collapse-resistant sandbag is made by wrapping barbed steel wire around the outside of a sack, and soil and stone materials excavated from the spillway are placed inside the collapse-resistant sandbag. The edges of the sack opening are tied with steel wire.

5. The landslide dam collapse mitigation and peak cutting system according to claim 2, characterized in that: The barbed iron chain is formed by winding an iron chain and a barbed steel wire, and the iron chain is formed by interlocking a plurality of oval iron rings in pairs.

6. The landslide dam collapse mitigation and peak cutting system according to claim 3, characterized in that: The two ends of the rock-blocking net are slidably mounted on steel rods. The steel rods are grooved hollow rods. The ends of the rock-blocking net are connected to the steel rods through connectors and rollers.

7. The landslide dam collapse mitigation and peak cutting system according to claim 6, characterized in that: The connecting piece is a plate-like structure, which is located in the groove of the steel rod. Two rollers are installed at intervals on one side of the connecting piece, and a clamping block is fixed in the middle of the other side, which is fixedly connected to the stone retaining net.

8. The landslide dam collapse mitigation and peak cutting system according to claim 6, characterized in that: A plurality of circular through holes are distributed on the lower side surface of the steel rod.

9. The landslide dam collapse mitigation and peak cutting system according to claim 2, characterized in that: The barbed iron chain at the end of the sandbag net is fixed at the junction of the barrier dam and the side bank slope through an anchor cable.

10. The landslide dam collapse mitigation and peak cutting system according to claim 9, characterized in that: A reel is fixed on the top end of the anchor cable, and a barbed iron chain is wound around the reel.

Images