工作面底板采动破坏深度研究

Study on mining fracture depth of working face floor

以新元矿9203工作面实际开采情况为背景,采用应变法现场原位监测煤层底板采动破坏深度,通过现场煤层底板监测钻孔内不同深度的应变传感器采集到的采动中应变变化规律,分析得出工作面底板采动破坏深度在11.5~13.5 m之间,再利用FLAC3D软件进行数值模拟,对模拟结果的应力分布及塑性区范围分析,结合煤层底板实际岩层组合情况,得出底板采动破坏深度约为12.2 m,该值在现场监测结果范围之内,验证了现场监测结果的正确性。

Taking actual mining condition of 9203 working face of Xinyuan Coal Mine as background, strain method was used for field monitoring mining fracture depth of seam floor, strain change law of mining process collected by strain sensors in differ- ent positions of monitoring hole in seam floor was obtained, which showed that the mining fracture depth of face floor was 11.5- 13.5 m; then using numerical simulation software FLAC 3D to analyze stress distribution and plastic zone range, and combining with rock stratum group situation, the mining fracture depth of face floor was determined as 12.2 m, which was within the range of field monitoring results and verified the field monitoring results.