浅埋煤层工作面开采覆岩应力场-裂隙场时变演化规律研究

Research on time-varying evolution law of overburden stress field and fracture field in shallow coal seam mining

为研究采煤工作面上覆岩层采动应力演化特征及破断过程,以高家梁煤矿40101工作面开采为例,建立数值模型,对工作面开采过程中应力场-裂隙场演化规律进行模拟。结果表明:利用莫尔-库伦准则分析最大主应力与最小主应力差值的变化规律可以判断岩层垮落、破坏之间的关系,通过数值模拟结果与现场实测结果进行比对,可以验证工作面开采过程中裂隙场与应力场时变演化的正确性。

The mining stress formed in the surrounding rock after coal seam mining is the root cause of the damage and fracture of the stope surrounding rock.In order to study the evolution characteristics of mining stress and the fracture process of overlying strata on the mining face,a numerical model was established to simulate the evolution law of stress field and fracture field in the mining process of the working face by taking the 40101 mining face of Gaoliang Coal Mine as an example.The results show that the rela-tionship between rock collapse and failure can be judged by using Mohr-Coulomb criterion to analyze the variation law of the dif-ference between maximum and minimum principal stresses.The correctness of the time-varying evolution of fracture field and stress field in working face mining can be verified by comparing the numerical simulation results with the field measured results.