Research On Failure Mechanism And Control Technology Of Surrounding Rocks In Dynamic Pressure Roadway

The stress state of roadway is affected by the mine exploit disposal and coal pillar dimension. Roadway disposal manner, mechanical properties and structural characteristics of the surrounding rock and the secondary stress state determines the pressure behavior characteristic. It is must waste the coal resource that left 20～30m coal pillar. Therefore how to adopt reasonable size of coal pillars and roadway support program on the dynamic conditions is important.This topic, based on engineering background of Xiangshan mining area, Hancheng, makes use of the method which is based on theoretical analysis and spot observation to research; According to observation on the locale, the paper analyses and researches deformation law of roadway under dynamic pressure; The paper use the numerical simulation software analysis the distributing of main stress, the development to Plastic zone and the displacement of surrounding rock of different time segment as well as different coal pillar width. Based on analysis for mechanism of bolting with wire meshes and cables controlling rock around roadway, and classification on rock around specific roadway and controlling principles, goes on design of supporting parameters; Through numeric simulation, goes on check up supporting parameters of roadway designing; Utilizing observation on the locale, goes on monitoring and feedback of bolting with wire meshes and cables.Combined with the subject of 11502 coal mining area, this topic makes use of research results to instruct production, optimizing the dimension of coal pillar, adopt bolting system, and analysis the economic benefits. Monitoring results show that: Affected by mining and mobile support of the pressure, mining pressure performs certain cyclical; The roadway locate in low stress area and avoid lateral supporting pressure zone when the coal pillar width of 7m; The bolting system which according to the theories of self-stabilized hidden arch solves the problem that I-steel can't play a good supporting role. It also enhances economic efficiency. This topic provides a scientific basis and practical experience for the study on surrounding rock stability under the dynamic pressure, optimal design of coal pillar and design of roadway support system.