A damping energy-consuming debris flow grid dam and its construction method

Abstract

The invention discloses a damping and energy-consuming debris flow grid dam and a construction method thereof. The purpose is to have stronger impact resistance, safe and reliable structure, small cross-sectional size of components, easy installation and disassembly, and cost saving. The damping and energy-consuming debris flow grid dam The dam includes a grid structure on the flow surface and a frame structure on the back surface arranged at intervals and oppositely, and a damping assembly arranged between the grid structure on the flow surface and the frame structure on the back flow surface, and the damping assembly It includes a first damper and a second damper, the first damper is arranged horizontally, and the two ends of the first damper are respectively connected to the grid structure on the upstream surface and the frame structure on the downstream surface, the The second damper is arranged obliquely, and the two ends of the second damper are respectively connected to the grid structure on the upstream side and the frame structure on the downstream side.

Description

technical field [0001] The invention relates to the field of debris flow prevention and control engineering, in particular to a damping energy-consuming debris flow grid dam and a construction method thereof. Background technique [0002] When a debris flow occurs, it carries a large amount of solid matter such as sand, stones, etc., and its volume content can reach about 13%-80%, which is extremely destructive. The grid dam can store most of the large solid matter in the debris flow, drain away the free water in the sediment, fine gravel and fluid, achieve the effect of water and rock separation, reduce the density, flow and scale of the debris flow, and reduce the downstream damage caused by the debris flow Degree. Therefore, grid dams are widely used in debris flow prevention and control projects. [0003] At present, the main problems of traditional grid dams are: (1) The design flow velocity of debris flow is considered according to the average flow velocity, which do...

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Problems solved by technology

[0003] At present, the main problems of traditional grid dams are: (1) The design flow velocity of debris flow is considered according to the average flow velocity, which does not reflect the flow velocity of the "tongue-shaped body" presented in the evolution process, which is large in the middle and small on both sides, and the "leading" is from the top to the top. The spatial distribution characteristic of the surface flow velocity is greater than the bottom flow velocity when falling down; (2) When resisting the impact of debris flow, the structure itself consumes energy, that is, the elastic-plastic conversion or damage of component materials consumes the impact energy of debris flow, and it is necessary to strengthen the structure itself The method of strength, stiffness and ductility ensures its safety, and the cross-sectional size of the structural components is large, resulting in serious waste; (3) The complex mountainous terrain severely restricts the construction site, the transportation of materials is difficult, and the problems of long construction period and high construction difficulty are prominent

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