综采工作面底板采动裂隙破坏深度研究

Study on fracture depth of floor mining in fully mechanized mining face

为了降低底板承压含水层对煤矿开采安全影响,确保工作面生产安全,采用数值模拟、现场实测技术手段对矿井开采的3#煤层底板裂隙范围探测,结果表明3号煤层开采后底板裂隙破坏深度在18~19m,数值模拟与现场实测结果接近。在现场无实测条件的矿井可以采用数值模拟手段对底板采动裂隙扩展深度进行预测,但是实际应用中为确保安全,建议增加一定的安全系数。

In order to reduce the influence of floor confined aquifer on coal mining safety,ensure production safety of working face,by means of numerical simulation and field measurement,the fracture range of No.3 coal seam floor was detected.The results show that the fracture depth of No.3 coal seam is 18~19m after mining,and the numerical simulation results are close to the field measurement results.In the mine without field measurement conditions,numerical simulation can be used to predict the propagation depth of mining induced fracture in floor,in order to ensure safety in practical application,it is suggested to increase a certain safety factor.