Abstract:
The size of narrow coal pillar and surrounding rock support control are related to the success of driving along goaf, and also the focus of coal mine safety production.In order to find out the law between the reserved size of coal pillar and the movement characteristics of surrounding rock, and to design reasonable support parameters, the movement characteristics of surrounding rock under different sizes of coal pillar are simulated and analyzed by means of numerical simulation based on the actual demand of Pingmei No.13 coal mine.The reserved size of narrow coal pillar along the goaf is determined by theoretical calculation, and the supporting parameters of dynamic pressure roadway are designed.The control effect of roadway support is analyzed.Finally, the design scheme of surrounding rock control is applied in the field and observed.The research results show that under the working condition of No.13 coal mine, when the size of narrow coal pillar is 5 m, the reduction rate of roadway section is the smallest; the parameter design of combined support scheme proposed is reasonable and feasible, the reduction rate of roadway section under the influence of mining is controlled within 20%, and the surrounding rock control effect is good.The research results can provide valuable experience for coal mine construction under similar working conditions.