CN114250743B - Landslide surge disaster prevention system and arrangement method thereof - Google Patents

Abstract

The invention discloses a landslide and surge disaster prevention system, which comprises at least one floating strip group floating on the water surface and a plurality of piles positioned at the water bottom, wherein the floating strip group is provided with a plurality of floating strips; each floating support strip group consists of a plurality of floating supports which are arranged along the edge of the water body of the mountain bank slope in a chain shape, the plurality of floating supports in the floating support strip group are connected through a horizontal flexible system fixing structure, and the floating supports at the two ends of the floating support strip group are fixed on the bank slope through flexible system fixing structures; the underwater block pile is used for preventing the sliding of the sliding mass to the center of the reservoir area and playing a role in braking the underwater movement of the sliding mass; the floating support is connected with the underwater block pile through a multi-section vertical flexible fastening and fixing structure; corresponding arrangement methods are also disclosed; the underwater block pile chain structure can effectively control the underwater sliding distance of the landslide body, plays a role in absorbing the kinetic energy of the landslide body, is economical in cost and has wide popularization and application prospects.

Description

A landslide surge disaster prevention system and its layout method

technical field

The invention relates to the field of geological disaster prevention, and more specifically, to a landslide surge disaster prevention system and an arrangement method thereof.

Background technique

Deep-cut canyons are widely distributed in Southwest my country, with large elevation differences and abundant hydropower resources. With the construction of a series of water conservancy projects, it will inevitably cause disturbance to the mountains in the reservoir area. Threats to upstream and downstream infrastructure and life and property safety. The hazards of bank landslides mainly include two aspects: first, a large amount of rock and soil slides into the reservoir, reducing the effective storage capacity, and even forming a dam in front of the dam, making the reservoir unusable; second, if the landslide slides into the reservoir at high speed, it will Huge surges are caused, which directly endanger the safety of the dam and the operation of the power station, and pose a huge threat to the lives and property of the people in the reservoir area. The impoundment of the reservoir will have adverse effects on a large number of landslides existing in the reservoir area.

At present, the focus of the management of the landslide surge disaster chain in the reservoir area is on the support and reinforcement of the landslide. However, there are many inducing factors for collapses and landslides. Once the landslide support measures fail, the landslide becomes unstable and rushes into the reservoir area, and the impact of the surge disaster is far greater than that of the landslide disaster.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a landslide surge disaster prevention system and its arrangement method that can effectively reward the impact of surge disasters.

The present invention provides: a landslide surge disaster prevention system, comprising not less than a number of buoy bar groups floating on the water surface and a plurality of block piles located at the bottom of the water; each buoy bar group is composed of a plurality of The edge of the slope water body is composed of floats arranged in a chain shape, and the multiple floats in the float group are connected by a horizontal flexible system fixed structure, and the floats at both ends of the float group are fixed to the bank slope through the flexible system fixed structure; The underwater block piles are used to block the sliding of the landslide body to the center of the reservoir area, and act as a brake on the underwater movement of the landslide body; the floating supports are connected to the underwater block piles through a multi-section vertical flexible fixed structure.

Further, the float is designed to be flat and hollow, which can ensure the floating performance of the float, and two multi-section flexible fixed structure connection channels are reserved along the long axis to ensure that the flexible fixed structure can pass through the float. connect.

Further, the multi-section vertically flexible fixed structure is an anchor chain.

Further, the multi-section vertical flexible fixed structure is fastened to the bottom of the float through a universal hook, and the distance between the float and the block pile can be adjusted by matching the chain links at different heights with the universal hook. The distance between them should be adjusted in response to the rise and fall of the water level.

Further, the connection between the water surface floating support and the bank slope and mountain body is reinforced by embedding long anchor rods through the multi-section flexible system fixed structure, and the multi-section flexible system fixed structure is connected with the anchor head.

Further, the block piles are cast with concrete.

Further, the upper side of the block pile is pre-embedded with connectors for the connection of the fixed structure of the flexible system.

Further, the volume of the block pile is determined by the following method:

Define the volume of the block pile as V, the tension of the fixed structure of the multi-section flexible system on the block pile is T, the volume of the landslide body is V _slip , the underwater impact speed of the landslide is s _slip , the density of the landslide body is ρ _slip , the density of water is ρ _water , and the gravity The acceleration is g, the density of the block pile is ρ _pile , the contact area between the block pile and the bottom of the reservoir is A, the friction coefficient is f, and the action time is t;

_The impact force F of the landslide body under water is:

F _slip = V _slip (ρ _slip - ρ _water ) gs _slip /t

The static friction force F _pile of the block pile is:

F _pile = V (ρ _pile -ρ _water ) gf+T

To ensure that the impact force of the landslide is not enough for the static friction of the soil slope block pile, that is, the inequality F _pile >F _slide , the volume V of the block pile can be obtained as:

V>V _slide (ρ _slip - ρ _water ) gs _slip / (t (V (ρ _pile - ρ _water ) gf + T)).

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

(1) The landslide surge disaster prevention system of the present invention organically combines block piles with float supports. On the one hand, the underwater block pile chain structure can effectively control the underwater sliding distance of the landslide body and play a role in absorbing the kinetic energy of the landslide body. effect.

(2) The landslide surge disaster prevention system of the present invention, the layout method does not conflict with the water level rise and fall requirements of the reservoir area, and can adapt to the water level rise and fall requirements of the reservoir area by adjusting the multi-section flexible fixed structure connecting the water surface float and the underwater block pile .

(3) The landslide and surge disaster prevention system of the present invention has a reasonable structure and technology, low cost, and has broad prospects for popularization and application.

Description of drawings

Fig. 1 is a side view sectional structure schematic diagram of a preferred embodiment of the present invention.

Fig. 2 is a top view of a preferred embodiment of the present invention.

Fig. 3 is a structural schematic diagram of a float-over in a preferred embodiment of the present invention.

The numbers in the attached drawings indicate respectively: 1-float bracket group, 11-float bracket, 111-flexible system fixed structure connection channel, 2-block pile, 3-landslide body, 4-vertical flexible system fixed structure, 5-ten thousand To the hook, 6-horizontal flexible fixed structure.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

Please refer to Fig. 1, a landslide surge disaster prevention system is characterized in that it includes not less than one float group 1 floating on the water surface and a plurality of block piles 2 formed by pouring concrete at the bottom of the water Each float bracket group 1 is made up of a plurality of float brackets 11 arranged in a chain along the edge of the mountain bank slope water body, and the multiple float brackets 11 in the float bracket group 1 are connected by a fixed structure of a horizontal flexible system. The floats at both ends of the support bar group 1 are fixed to the bank slope through the flexible system fixing structure; the underwater block piles 2 are used to block the sliding of the landslide body to the center of the reservoir area, and play a braking role in the underwater movement of the landslide body; 11 is connected to the underwater block pile through a multi-section vertical flexible fixed structure 4 (such as an anchor chain); it plays a role in inhibiting the propagation of the surge head wave.

The floater is designed to be flat and hollow, which can ensure the floating performance of the floater. Two multi-section flexible fixed structure connection channels are reserved along the long axis to ensure that the flexible fixed structure can pass through the float. The fixed structure passes through the channel reserved in the float, and connects all the float to two multi-section flexible fixed structures to ensure that the float does not overturn. Buried anchor head connections.

The multi-section vertical flexible fixed structure 4 is fastened to the bottom of the float 11 through the universal hook 5. By matching the chain links at different heights with the universal hook 5, the float 11 and the block can be adjusted. The distance between the piles 2 is adjusted in response to the rise and fall of the water level.

The water surface float is reinforced by embedding long anchor rods at the connection between the multi-section flexible system fixed structure and the bank slope, and the multi-section flexible system fixed structure is connected with the anchor head.

The upper side of the block pile is pre-embedded with connectors for the connection of the fixed structure of the flexible system.

The volume of block pile 2 is determined by the following method:

Define the volume of the block pile as V, the tension of the fixed structure of the multi-section flexible system on the block pile is T, the volume of the landslide body is V _slip , the underwater impact speed of the landslide is s _slip , the density of the landslide body is ρ _slip , the density of water is ρ _water , and the gravity The acceleration is g, the density of the block pile is ρ _pile , the contact area between the block pile and the bottom of the reservoir is A, the friction coefficient is f, and the action time is t;

_The impact force F of the landslide body under water is:

F _slip = V _slip (ρ _slip - ρ _water ) gs _slip /t

The static friction force F _pile of the block pile is:

F _pile = V (ρ _pile -ρ _water ) gf+T

To ensure that the impact force of the landslide is not enough for the static friction of the soil slope block pile, that is, the inequality F _pile >F _slide , the volume V of the block pile can be obtained as:

V>V _slide (ρ _slip - ρ _water ) gs _slip / (t (V (ρ _pile - ρ _water ) gf + T)).

The arrangement method of the above-mentioned landslide surge disaster prevention system comprises the following steps:

Step 1: According to the wave conditions, area size and volume orientation of the landslide body in the water area to be defended, predict the main direction of the swell, determine the length of the buoy bar group 1, and the volume of the block pile;

Step 2: In the case of low water level, first lay two multi-section horizontal flexible fixed structures connected to the floats, one end of which is connected to the mountain, and after the floats are connected in series, the other end is also connected to the mountain; The matching block piles are towed to each floating position by using a floating platform on the water, and an opening is set in the center of the platform for placing block piles. 3.0-3.5 times of the maximum total load (block pile, multi-section flexible fixed structure, total weight of float) to ensure sufficient stability of the platform during hoisting operations;

Step 3: Sink the block pile into the bottom of the water, connect the float to the underwater block pile with a multi-section vertical flexible system fixed structure, and adjust the length of the multi-section vertical flexible system fixed structure according to the water level;

Step 4: For landslides with large volumes, some defense units in the center of the defense system can be reinforced, and connected to the bank slope through a multi-section horizontal flexible fixed structure to enhance the overall stability of the defense system against impacts.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention , should be included within the protection scope of the present invention.

Claims (8)

1. A landslide and surge disaster defense system is characterized by comprising not less than 1 floating strip group (1) floating on the water surface and a plurality of block piles (2) positioned at the water bottom; each floating support strip group (1) consists of a plurality of floating supports (11) which are arranged along the edge of the water body of the mountain bank slope in a chain shape, the plurality of floating supports (11) in the floating support strip group (1) are connected through a horizontal flexible system fixing structure (6), and the floating supports at the two ends of the floating support strip group (1) are fixed on the bank slope through flexible system fixing structures; the underwater block pile (2) is used for preventing the sliding of the sliding mass to the center of the reservoir area and playing a role in braking the underwater movement of the sliding mass (3); the floating support (11) is connected with the underwater block pile through a multi-section vertical flexible system fixing structure (4); the floating support is designed to be flat and hollow, the floating performance of the floating support can be guaranteed, two multi-section flexible system fixing structure connecting channels (111) are reserved in the long axis direction, and the flexible system fixing structures can penetrate through the floating support to be connected.

2. The landslide surge disaster defense system according to claim 1, wherein the multi-section vertically flexible fastening fixing structure (4) is an anchor chain.

3. The landslide and surge disaster prevention system according to claim 2 wherein the multi-section vertical flexible fastening structure (4) is fastened to the bottom of the floating platform (11) by a universal hook (5).

4. The landslide surge disaster defense system according to any one of claims 1 to 3, wherein the surface floatover is reinforced by embedding long anchor rods at the joint of the multi-section flexible system fixing structure and the bank slope, and the multi-section flexible system fixing structure is connected with the anchor head.

5. Landslide surge disaster prevention system according to any one of claims 1-3 wherein the block piles (2) are cast of concrete.

6. The landslide and surge disaster prevention system of any one of claims 1-3 wherein the block pile has embedded on its upper side a connector for flexible tie-fixing structure connection.

7. A landslide and surge disaster prevention system according to any one of claims 1-3 wherein the volume of the block pile (2) is determined by the following method:

the volume of each block pile is defined as V, the tensile force of the block pile subjected to the multi-section flexible system fixing structure is T, and the volume of the sliding mass is V _{Sliding device} Underwater impact velocity s of landslide _{Sliding device} The density of the landslide mass is rho _{Sliding device} Density of water is ρ _{Water (W)} G is the gravitational acceleration and rho is the density of the block pile _{Pile and its making method} The contact area of the block pile and the bottom of the reservoir is A, the friction coefficient is f, and the acting time is t;

underwater impact force F of landslide body _{Sliding device} Comprises the following steps:

F _{sliding device} ＝V _{Sliding device} (ρ _{Sliding device} -ρ _{Water (W)} )gs _{Sliding device} /t

Static friction force F of block pile _{Pile and its making method} Comprises the following steps:

F _{pile and its making method} ＝V(ρ _{Pile and its making method} -ρ _{Water (W)} )gf+T

Ensuring that the landslide impact force is not enough to the static friction force of the soil block pile, i.e. inequality F _{Pile and its making method} >F _{Sliding device} The volume V of the block pile is as follows:

V>V _{sliding block} (ρ _{Sliding device} -ρ _{Water (I)} )gs _{Sliding block} /(t(V(ρ _{Pile and its making method} -ρ _{Water (I)} )gf+T))。

8. The method for arranging a landslide and surge disaster prevention system according to any one of claims 1-3, comprising the steps of:

step 1: according to the water area wave condition, the area and the size of the landslide body to be defended, the main direction of surge is pre-judged, and the length of the floating bar group (1) and the volume of the block pile are determined;

and 2, step: under the condition of low water level, firstly laying two horizontal flexible fastening and fixing structures connected with the floating support, wherein one end of each horizontal flexible fastening and fixing structure is connected with the mountain body, and after the floating support is connected in series, the other end of each horizontal flexible fastening and fixing structure is also connected with the mountain body; dragging the matched block pile (2) with the length determined in the step (1) to each floating support position by adopting a water floating platform, arranging an opening in the center of the platform for throwing the block pile, wherein the size of the opening is not smaller than the section area of the maximum designed block pile, and the maximum bearing capacity of the floating platform is not smaller than 3.0-3.5 times of the maximum stacking total amount during construction operation, so that the platform has enough stability during hoisting operation;

and step 3: sinking the block pile (2) to the water bottom, connecting the floating support with the underwater block pile by using a multi-section vertical flexible fastening fixing structure (4), and adjusting the length of the multi-section vertical flexible fastening fixing structure according to the water level;

and 4, step 4: aiming at landslide bodies with large square quantity, part of defense units in the center of the defense system can be reinforced, and the defense system is connected with a bank slope through a horizontal flexible system fixing structure, so that the overall stability of the defense system in response to impact is enhanced.

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