工作面过联络巷微震时空能演化机制研究

Study on the evolution mechanism of microseismic time-space-energy in working face passing through connection roadway

在工作面回采过程中,由于受断层等地质因素的影响或由于运输任务的需要,会出现探巷、设备眼等联络巷斜穿工作面,影响正常开采。本文基于羊东矿8470工作面微震数据研究,对工作面通过联络巷分析表明,通过联络巷具有阶段性特征,随工作面的推进,靠近联络巷附近有1个突变;联络巷与其他巷道交叉处为应力集中区,易发育微震事件属于薄弱区域;在超前影响阶段内事件能量较低,随着工作面的推进,离联络巷位置越近,大能量事件开始增多。在到达联络巷四分之三处,能量分布开始减少;在通过联络巷期间,垂向上主要是近煤层事件,深部发育特征不明显。

In the process of working face mining,due to the influence of geological factors such as faults or the need of transportation tasks,there will be connection roadways such as exploration roadways and equipment holes,obliquely crossing the working face and affecting normal mining.Based on the study of microseismic data of No.8470 Face in Yangdong Mine,the analysis of the working face through the connection roadway showed that the process of passing through the connection roadway had stage characteristics.With the advancement of the working face,there was a mutation near the connection roadway.The intersection of the connecting roadway and other roadways was stress concentration area and weak areas,where the microseismic events were easy to develop.In the advanced influence stage,the event energy was low.With the advancement of the working face,the closer to the position of the connection roadway,the large energy events began to increase.At three-quarters of the connection roadway,the energy distribution began to decrease;during the period of passing through the connection roadway,the event near coal seam mainly developed in the vertical direction,and the deep development characteristics were not obvious.