Flow-passing-type debris flow blocking dam and dam group

Abstract

The invention discloses a flow-passing-type debris flow blocking dam and a dam group. The flow-passing-type debris flow blocking dam and the dam group which is composed of a plurality of flow-passing-type debris flow blocking dams are included. The flow-passing-type debris flow blocking dam is composed of a main dam body, an overflow weir and a plurality of draining holes. The overflow weir is located above the main dam body, and the multiple draining holes are formed in the bottom of the main dam body. The flow of the overflow weir and the flow of the draining holes should meet the following conditions that the discharge capacity of the overflow weir and the draining holes satisfies the requirement of the maximum flow rate of debris flow capable of guaranteeing safety of the blocking dam, the let-down flow rate of the draining holes is smaller than the maximum let-down safety flow rate capable of guaranteeing safety of a downstream protective area, the minimum width of the draining holes can ensure that stone with the maximum stone particle size in channel passing flow, desilting vehicles and equipment pass through, and the total storage capacity of the blocking dam and the dam group can effectively block the maximum total rush-out amount of the debris flow under the fortification standard. The flow-passing-type debris flow blocking dam and the dam group have the beneficial effects that the structure is safe, desilting is convenient, the retaining storage capacity can be used repeatedly, and the effects of preventing disasters and reducing damages are obvious.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of geological disasters, and relates to a flow-through debris flow retaining dam and a group of dams. Background technique [0002] At present, the role of debris flow retaining dams is generally to block, and its purpose is mainly to hold water and sediment, change the conditions of water and sediment delivery, adjust the discharge of water and sediment, and stabilize slopes and valleys. When the effective storage capacity in the retaining dam is filled with mud and sand, the retaining and regulating functions will be lost, and the disaster prevention and mitigation functions will be greatly weakened. [0003] After the effective storage capacity in the retaining dam is filled with mud and sand, a large amount of solid loose matter is stored in the ditch, and the pressure of the debris flow accumulation on the retaining dam is high. Once the retaining dam collapses, the solid loose...

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