Hydraulic support and surrounding rock coupling three-dimensional dynamic design method

Abstract

The invention discloses a three-dimensional design method of a hydraulic support, which considers the dynamic effect of surrounding rocks positioned on a coal face. The three-dimensional design method of the hydraulic support comprises the following steps of: simulating the motions of a top plate, a coal bed and a bottom plate in the advancing process of the coal face by adopting discrete element software; building a support-surrounding rock three-dimensional coupling model, and computing the reverse supporting effect and the control action of the hydraulic support on surrounding rock motion; circularly optimizing support parameters to obtain a structure which has optimal supporting effect on the surrounding rocks; simulating to obtain the distribution regularity of the tension, the bending and the torsion internal force of a part of the hydraulic support by adopting dynamic software under the stress conditions, i.e. unbalance loading, torsion, impact of caving rocks on a shield beam of the hydraulic support, and the like, of the hydraulic support at different time, on different positions and under different geological conditions of coal face advancing; and designing and optimizing the structure form of the hydraulic support by combining with structure arrangement requirements and adopting a finite element method. The three-dimensional design method can effectively enhance the adaptive capacity of the hydraulic support on surrounding rock change, strengthen the stability and the reliability and ensure that the coal mining work is safely and efficiently carried out.

Description

technical field [0001] The invention relates to a design method of a hydraulic support, in particular to a three-dimensional design method of a hydraulic support in consideration of the dynamic influence of the surrounding rock of a coal mining face. technical background [0002] Before elaborating on specific technical issues, first explain the meaning of the following three terms: [0003] Surrounding rock of the working face: the rock formation within the range affected by the excavation of the coal mining face, which is divided into three parts: the roof, the coal seam and the floor. [0004] Hydraulic support: support equipment for coal mining face, used to support and control the roof, and isolate the goaf; it is used in conjunction with the coal mining machine to realize the comprehensive mechanization of coal mining. [0005] Coupling: that is, dependence and mutual influence. The boundary condition of the support is the surrounding rock, and the characteristics of...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to address the deficiencies in the static structure design of the current support and the characteristics of the longwall working face with a large mining height, and propose a method that comprehensively considers the impact of the surrounding rock migration and the change of mining height on the support dynamics during the entire coal mining process of the working face. Three-dimensional design method of scaffold

The method of the invention can effectively solve the problems of pertinence and poor adaptability of the current support design

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