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 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...

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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