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

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 ...

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.

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