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, weirs, etc., can solve the problems of dam breakage, weak maintenance force, and slow excavation progress of spillways, so as to achieve short construction time and ensure the safety of life and property Effect

Active Publication Date: 2012-04-11
NANJING HYDRAULIC RES INST
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  • 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 diffi

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

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Experimental program
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Effect test

Embodiment 1

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

[0046] Based on the dam risk assessment figure 1 Zhong Earth-rock Dam 1-1 has a high dam-break risk. The dam crest elevation is 8.0m, and the water level on the dam has reached 7.6m. Check flood level. According to the short-term forecast, there will still be a large flow process in the upstream in the next 3 days. A flood discharge channel has been abandoned for a long time in disrepair. It is expected that the earth-rock dam will be overtopped in 5 hours, and emergency discharge facilities need to be constructed within 5 hours.

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

Embodiment 2

[0056] image 3 The dam crest elevation of Zhong Earth-rock Dam 2-1 is 8m, and the dam break has reached the first stage. The downstream slope has formed a gully but has not reached the second stage and has formed a stepped ridge. image 3 Shown.

[0057] (1) Determine the size of the trough opening door to be 3.5m based on the existing breach width;

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

[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 order is from top to bottom;

[0060] b. The widest part of the edge of the breach is 3.5m, and the anchoring level is W H ≥2~3B, where H Dam crest =8m, B=3.5m, calculate W H ≥7~10.5m, in order to increase protection, the horizontal anchoring range is 10.5m. A three-dimensional composite filter pad with a width of 5m is selected, and a...

Embodiment 3

[0065] According to the dam risk assessment, the earth-rock dam 3-1 has a high risk of dam failure, the dam crest elevation is 14m, and the storage capacity is 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 in the upstream in the next 3 days. The original flood channel of the earth-rock dam has been abandoned for a long time. It is expected that the earth-rock dam will overflow in 8 hours. It is necessary to construct emergency drainage facilities within 8 hours.

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

[0067] (2) Use continuous anchor rods to anchor the waterproof geotextile at the position of the downstream...

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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 relates to a passive discharge rescue method for earth-rock dam breaks, which belongs to the field of flood control and rescue of earth-rock dams in water conservancy projects. Background technique [0002] my country has built more than 86,000 reservoirs and 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. Many of these reservoirs were built by local farmers and have short hydrological series. They have underestimated the flood control capacity and discharge capacity of the reservoir. Many reservoirs have low design and construction standards, and the phenomenon of insufficient discharge capacity of flood discharge facilities is common (many small reservoirs) The discharge capacity of the spillway is not up to the standard), once it encounters a flood that exceeds the standard, it is very likely to cause a dam collapse accident, which will ...

Claims

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Application Information

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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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