C型采场支承压力分布特征的数值模拟研究

冲击地压的发生与支承压力的分布有重要关系。为研究C型采场支承压力的动态变化规律，采用FLAC3D软件对孤岛工作面推进过程中煤体垂直应力场进行了数值模拟。通过对工作面推进过程中煤体支承压力的平面分布特征、走向支承压力和倾斜支承压力的动态演化特征进行分析，得到以下结论：① 煤体中垂直应力分布呈“C”形；② 孤岛工作面超前支承压力影响距离为正常工作面的3～5倍；③ 双工作面“见方”时，支承压力峰值达到最大值。工程实例验证了结论的可靠性，其结果可为现场冲击地压预测和防治提供依据。

Numerical simulation of abutment pressure distribution of C-shaped stope

The occurrence of rock burst is related to the distribution of abutment pressure. In order to study dynamic variation laws of abutment pressures of C-shaped stope, vertical stress fields in coal mass during advancing process of island working face were simulated. The plane distribution characteristics of abutment pressures and the dynamic evolution characteristics of strike abutment pressures and lateral abutment pressures in coal mass were analyzed; and conclusions were drawn as follows: (1) the distribution of vertical stress in coal mass is C-shaped; (2) the influence distance of lead abutment pressure of island working face is 3-5 times higher than that of normal working face; (3) the peak of abutment pressure reaches its maximum when the advanced distance of the working face is equal to the length sum of two nearby working faces. Finally, the engineering example was analyzed. The results can provide a basis for prediction and control of rock burst.