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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。
The occurrence of rock burst is closely related to the distribution of bearing pressure. In order to study the dynamic variation law of bearing pressure of C-type stope, FLAC3D software is used to simulate the vertical stress field of coal mass in the process of island face propulsion. Through the analysis of the plane distribution characteristics of the supporting pressure of the coal seam and the dynamic evolution characteristics of the supporting pressure and the inclined supporting pressure during the advancing process of the working face, the following conclusions are obtained: ① The vertical stress distribution in the coal body is “C”; ② Island working surface support pressure ahead of the impact of the normal working surface of 3 to 5 times; ③ double face “square”, the maximum pressure to support the maximum. The engineering example verifies the reliability of the conclusion. The result can provide the basis for the prediction and control of the rockburst on site.