A design method for segmental interception of debris flow flexible protection system

Abstract

The invention provides a design method used for segmented intercepting of a debris flow flexible protection system. The method comprises the steps that according to hydrologic survey data, the size and hydrogeology information of a debris flow groove of a pedestrian accessible area are cleared; the number of segmented intercepts of the debris flow flexible protection system is determined accordingto the hydrologic survey data; the impact effect Fd of debris flow, the component Fg of gravity of an accumulation body on intercepting units, and frictional resistance Ff of the component of the gravity of the accumulation body on the normal of the groove are determined separately, and the resultant force is the load F acting on the debris flow flexible protection system; a finite element modelis built, the load F is equally distributed on mesh nodes, and the internal force, deformation and displacement of each component in the system are calculated; the peak internal force of each component like meshes and supporting ropes is extracted for strength checking calculation; and structure design of connection between structural steel and upper and lower supporting ropes, connection betweensteel wires and anchor rods and the like is conducted. The design method can be used for segmented intercepting of the debris flow flexible protection system.

Description

Technical field [0001] The invention relates to a design method for segmental interception of a debris flow flexible protection system, and belongs to the field of geological disaster protection engineering. Background technique [0002] Debris flow refers to the phenomenon that a mixture of loose soil, rock and water flows along the slope under the action of gravity. It is widely distributed in southeastern Tibet, Hengduan Mountains, western and northeastern Yunnan, and Sichuan mountains. According to the different composition of solid matter, it can be divided into mud flow, mud-rock flow, water-rock flow. The commonly used prevention measures mainly include gravity dam, grid dam, gabion gabion dam and mud-rock flow flexible protection system. The mud-rock flow flexible protection system has water filtration The characteristics of sedimentation, high efficiency and economy, convenient construction, and good maintenance have been widely used in the prevention and control of debr...

AI Technical Summary

Problems solved by technology

However, at present, relevant domestic codes only give design references for gravity dams and grid dams, and do not involve flexible protection systems. As a result, the current use of flexible protection systems for debris flows is only based on experience, without relevant data support and theoretical guidance, so it is impossible Effectively guarantee the reliability of debris flow prevention and control

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