薄煤层工作面液压支架可靠性评价及围岩控制技术研究

以某矿为工程背景，通过理论分析、现场监测对工作面液压支架的可靠性进行分析，并借助现场检测、数值模拟的方法对片帮、煤柱的合理宽度进行研究。通过研究发现:该矿选择的额定工作阻力为4 000 kN的液压支架能够满足该矿回采的需要；在正常生产期间工作面煤壁片帮、漏顶现象并不严重，仅在顶板周期来压期间出现较为明显的煤壁片帮、漏顶现象，片帮深度小于等于100 mm所占的比例较大；同时通过对工作面侧向支承压力分析发现，其影响范围为工作面侧向30~35 m，剧烈影响范围为20 m左右，峰值大小约30 MPa，峰值距工作面侧向距离7~9 m，由此判断，工作面正常留设煤柱的合理尺寸为30~35 m；沿空掘巷时，留设煤柱的合理尺寸可以确定为7~9 m。

Research on reliability evaluation and surrounding rock control technology of hydraulic supporting in thin coal seam face

Based on the engineering background of a mine，the reliability of hydraulic support in working face is analyzed through theoretical analysis and on-site monitoring，and the reasonable width of side and coal pillar is studied by means of on-site testing and numerical simulation.Through research，it is found that the hydraulic support with rated working resistance of 4 000 kN can meet the needs of mining in this mine；the phenomenon of slice wall and roof leakage in working face is not serious during normal production period，only obvious phenomenon of slice wall and roof leakage occurs during the period of periodic roof weighting，and the depth of slice wall is less than 100 mm.At the same time，through the analysis of the lateral abutment pressure of the working face，it is found that the influence range is 30~35 m in the lateral direction of the working face，the violent influence range is about 20 m，the peak value is about 30 MPa，and the peak value is about 7~9 m in the lateral direction of the working face.In roadway，the reasonable size of coal pillars can be determined to be 7~9 m.