工作面推进过程中上覆岩层冒落的数值模拟

为了研究在工作面推进过程中上覆岩层冒落情况，基于“支架梁”模型理论、连续介质力学和损伤介质力学原理，采用RFPA^2D分析系统，模拟了岩石从裂纹萌生、扩展直至断裂的全过程，再现了煤层采动中其上覆岩层来压及工作面推进过程中剪应力、岩层下沉的变化规律。结果表明：厚顶对上覆岩层的运动起控制作用，它是该岩层系统中的关键层，另外，随着工作面向前推进，在工作面前方煤壁形成支承压应力升高区，上覆各岩层的下沉量不断增加。

Numerical Simulation of Overlying Strata Caving in the Process of Face Advancing

In order to study the caving situation of overlying strata in the processs of face advancing,and based on the theory of ＂support beam＂ model and the principles of continuous media mechanics and damage media mechanics,the author simulated the whole process from crack being germinated and expanded to roof rocks being fractured by using RFPA2D analysis system, reproducing the weighting of overlying strata in coal mining and changing laws of shear stress and strata subsidence in the process of face advancing. The results showed that the thick roof rock controlled the movement of overlying strata and it was critical layer in rock system. In addition,with the face advanced forward, the area of abutment pressure increased was formed at the coal wall of working face and the subsidence of overlying strata continuously increased.