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以北京大安山煤矿为研究背景,采用现场监测、理论分析、数值模拟等方法,对大安山煤矿煤层矿压显现及顶板“O-X”型破坏规律进行研究。通过地压监测系统研究了大安山煤矿轴13槽顶板垮落及矿压显现规律;根据现场实测数据建立数值模型,研究开采过程中顶板塑性区形成、演化及破断规律。结果表明,工作面中部支架阻力要明显大于上部和下部。来压时刻,回风巷、运输巷工作面前方压力增高的范围平均值分别为12.17 m和9.46 m,压力平均峰值分别为24 MPa和23.57 MPa,且通过模拟分析得到了采空区顶板“O-X”型破断规律。模拟结果所得的初次来压、周期来压步距与现场监测结果基本一致。
Taking Daanshan coal mine in Beijing as the research background, the authors conducted a study on the occurrence of coal bed pressure and the failure of the roof “O-X” type in the Daanshan coal mine by on-site monitoring, theoretical analysis and numerical simulation. Through the ground pressure monitoring system, the roof caving and rock pressure of the shaft of the 13th channel in the Daanshan coal mine were studied. The numerical model was established based on the measured data to study the formation, evolution and breaking of the plastic zone during the mining process. The results show that the resistance of the middle part of the working face is obviously larger than the upper part and the lower part. The mean values of pressure increase in front of the return airway and transportation lane are 12.17 m and 9.46 m respectively, and the average pressure peaks are 24 MPa and 23.57 MPa, respectively. And through the simulation analysis, the roof “ OX ”type breaking rules. The initial pressure obtained from the simulation results, the cycle pressure step and the site monitoring results are basically the same.