Passive-drainage emergency rescue method in case of earth-rock dam break

An earth-rock dam and discharge technology, applied in the direction of dams, barrages, barrages, etc., can solve the problems of weak maintenance force, dam break, and difficulty in working, and achieve the effect of ensuring the safety of life and property and shortening the construction time

Active Publication Date: 2013-07-17
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For small reservoirs and ponds and dams with a large area and a large area in my country, the maintenance force is relatively weak at ordinary times. When there is a danger of flooding, the excavation progress of the spillway is often slow, and it is often difficult to work
In addition, since earth-rock dams are usually not allowed to overflow the top, there is an important risk in the temporary rush to dig a spillway, that is, the overflowing water will scour the dam body, and even cause a complete dam failure accident.

Method used

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  • Passive-drainage emergency rescue method in case of earth-rock dam break
  • Passive-drainage emergency rescue method in case of earth-rock dam break
  • Passive-drainage emergency rescue method in case of earth-rock dam break

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The rescue method for passive discharge of earth-rock dam failure includes the following steps:

[0046] According to the dam risk assessment figure 1 Middle earth-rock dam 1-1 has a high risk of dam failure. The dam crest elevation is 8.0m, and the water level above the dam has reached 7.6m. Some flood discharge channels have been in disrepair for a long time and have been abandoned. It is estimated that the earth-rock dam will overflow in 5 hours, and emergency discharge facilities need to be built within 5 hours.

[0047] (1) According to the calculation results, design a discharge channel 1-2 with a width of 5m and a top elevation of 7.5m in the middle of the dam crest, see figure 1 . The discharge channel is constructed by differential blasting, and the dam surface under the discharge channel is anchored with a waterproof geotextile three-dimensional composite filter pad.

[0048] (2) Use the continuous anchor rod to anchor the waterproof geotextile at the prede...

Embodiment 2

[0056] image 3 The dam crest elevation of Zhongtushidam 2-1 is 8m and has begun to overflow. The current situation of the dam failure has reached the first stage and the downstream slope has formed gullies. image 3 shown.

[0057] (1) According to the width of the existing breach, the size of the gate of the chute is determined to be 3.5m;

[0058] (2) Use the continuous anchor rod to anchor the waterproof geotextile at the predetermined discharge channel body position on the downstream dam slope;

[0059] a. The anchoring elevation range is from the water surface downstream of the dam to the top of the discharge channel, and the laying sequence is from top to bottom;

[0060] b. The widest part of the edge of the breach is 3.5m, and the anchoring horizontal range is W H ≧2~3B, of which H 坝顶 =8m, B=3.5m, calculated W H ≧7~10.5m, in order to increase protection, the horizontal anchoring range is 10.5m. A three-dimensional composite filter mat with a width of 5m is selec...

Embodiment 3

[0065] According to the risk assessment of the dam, it is concluded that the earth-rock dam 3-1 has a high risk of dam failure, with a crest elevation of 14m and a storage capacity of 80,000m 3 , the water level on the dam has reached the check flood level of 12.5m. According to the short-term forecast, there will still be a large flow process upstream in the next 3 days. The original flood discharge channel of the earth-rock dam has been in disrepair for a long time and has been abandoned. roof, it is necessary to construct emergency drainage facilities within 8 hours.

[0066] (1) According to the calculation results, a discharge channel with a width of 10m and a top elevation of 13m is designed in the middle of the dam crest, and a waterproof geotextile three-dimensional composite filter pad is anchored on the dam surface under the discharge channel, see Figure 5 .

[0067] (2) Use the continuous anchor rod to anchor the waterproof geotextile at the predetermined discharg...

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Abstract

The invention provides a method for eliminating risk of dam break, and belongs to the field of flood fighting of an earth-rock dam in hydraulic engineering. In the method, a drainage channel is pre-arranged in the case of higher overtopping risk of the earth-rock dam, or a drainage channel is emergently arranged before the earth-rock dam reaches a second stage of dam break due to overtopping so as to lower the reservoir level. The method mainly comprises the following steps of: (1) determining the position of a drainage groove and the size of a drainage groove opening; (2) anchoring waterproof geotextile at the predetermined position of the drainage groove body at a downstream dam slope by a continuous anchor rod; (3) carrying out paving protection or riprap protection on a dam toe; and (4) lowering elevation of a dam crest by blasting or machinery excavation so as to form the drainage groove opening. By adopting the brand-new passive-drainage emergency rescue method in case of earth-rock dam break, the construction period is shortened, and the risk of dam failure can be prevented in the case of forced overflow of the earth-rock dam so as to guarantee safety of life and property of people in the downstream.

Description

technical field [0001] The invention discloses a method for passively releasing flow from an earth-rock dam and belongs to the field of flood control and emergency rescue of earth-rock dams in water conservancy projects. Background technique [0002] my country has built more than 86,000 reservoir dams and more than 6.4 million small ponds and dams, of which more than 90% are earth-rock dams. These reservoirs have been constructed for a long time, and many of them were built by local farmers themselves. The hydrological series is short, and the flood control storage capacity and flood discharge capacity of the reservoirs are underestimated. The discharge capacity of the spillway is not up to the standard), once the flood exceeds the standard, it is very likely that the overburden and dam failure will occur, which will bring serious disasters to the downstream. In the past, flood protection of earth-rock dams was mainly based on prevention. The more common method was to buil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B7/06
Inventor 刘宁李云张志彤宣国祥黄金池王晓刚吴泽斌刘火箭黄岳曾晨军李君祝龙
Owner NANJING HYDRAULIC RES INST
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