Study On Surrounding Rock Deformation Mechanism And Reinforced Support Techniques For The Roadway Under Multiple Disturbance Of Deep Coal Seams Mining

With the increasing of mining depth, the problem that roadway hard to be stable influences the mine safety production seriously because of the mining stress.At the same time, roadway surrounding rock deformation intensified influenced by coal mining. The period of roadway maintenance difficulties is from using develop to excavation.With Pingdingshan coal industry group NO.4 coal mine four main slope as the engineering background, papers is mainly studied the surrounding rock stress distribution change law, the main slope deformation characteristics of surrounding rock and reinforcement techniques under multiple disturbance of deep coal seams mining, by field investigation, theoretical analysis, numerical simulation and field measurement. The main conclusions are as follows:(1) Roof and floor stress distribution mechanics model is deduced, respectively, with coal seams mining, combined with Pingdingshan coal mine four main slope geological conditions, the system analyzes the characteristics of rock stress distribution on different horizontal cross section in the various stages of mining coal seams by theoretical calculation and numerical simulation. Research results show that the lower coal seam mining play a decisive role in surrounding rock stress distribution, the upper upper coal seam mining in the upper area had a greater influence on the stress distribution of surrounding rock.(2) Simulation analysis of the different position of the main slope deformation characteristics of surrounding rock under multiple disturbance of deep coal seams mining by simulation analysis. And put forward that the roadway deformation occurs in the lower coal seam mining process, the upper part of the slope deformation of surrounding rock is higher than the middle and lower part of the slope, the upper main slope during upper coal mining near top and bottom corners side is shear failure.(3) Based on the deformation mechanism of roadway surrounding rock, this paper proposes the quaternity coupling reinforcement scheme and conducts the field practice.The roof-to-floor convergence is 277 mm and the two-sided displacement is 135 mm after implementation of reinforcement schemes. This proved the reliability of the reinforcement scheme.