A method for dredging a dam body of a barrier lake

Abstract

The invention discloses a method for dredging a dam body of a dammed lake. Firstly, a water storage tank is excavated on the dam body of the dammed lake according to the thickness and length of the dam body of the dammed lake and the stability of earth and rock of the dam body of the dammed lake, and the Multiple water storage holes are excavated at the corresponding positions in the water storage tank, and the water in the river channel is injected into the water storage tank and the water storage cave by using the water pump, so that the dam body can be washed away by the water in the water storage cave and the water storage tank, This method uses the momentum of water to dredge the river, which is safer than the method of directly using explosive blasting to dredge the river. Furthermore, before injecting water into the water storage tank and the water storage hole, the water along both sides of the water storage tank Excavate trenches or drill at least one row of holes in the river channel, and inject low-temperature liquid to freeze the soil around the trenches or holes, so as to prevent the secondary blockage caused by the collapse of the soil on both sides of the dam body after the dam breaks.

Description

technical field [0001] The invention relates to flood fighting and disaster reduction technology, in particular to a method for dredging a dam body of a dammed lake. Background technique [0002] A barrier lake refers to a lake formed by landslides, earth-rock flows or lava blocking the river channel and storing water to a certain extent. The formation of a barrier lake is usually caused by unstable geological conditions. When the dam body of a barrier lake is scoured, eroded, or dissolved At that time, the barrier lake is easy to break its embankment, which will cause devastating damage to the downstream area. Most of the barrier lakes will continue to be filled with water from the original river within a few days after formation, and the accumulated water will be enough to break the embankment. Therefore, once the barrier lake is formed, flood control measures must be taken as soon as possible. [0003] After the formation of the barrier lake, dredging the river channel a...

AI Technical Summary

Problems solved by technology

[0003] After the formation of the barrier lake, dredging the river channel as soon as possible is the best way to solve the risk of the dam failure of the barrier lake. At present, the method of directly placing explosives on the dam body of the barrier lake is usually used to dredge the channel. The impact force of this method is difficult to control. Once the control is not good, excessive blasting will occur, and the situation will get out of hand.

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