Abnormal Zone Identification of Roof Looseness in Excavation Roadway Based on Microseismic Technology

In order to detect and identify looseness range and degree of roof looseness abnormal zone in excavation roadway, analyze the relation between roof looseness abnormal zone on account of roadway excavation and supporting parameters, combining with the conditions of complicated and broken separation roof of 62113 working face in Xinzhuangzi coal mine in Huainan, a advanced microseismic monitoring technology was used to monitor real-time and dynamically the roadway excavation and other mining activities. The monitoring and identification results show that the spatial distribution state of roof micro rupture in excavation roadway is the form of 3D microseismic location events, and the accumulative statement of micro rupture illustrates range and degree of roof looseness abnormal zone in excavation roadway, meanwhile, which will change in the company wake of excavation time, supporting speed and lithology alteration. With above rules, the roof looseness abnormal zone in excavation roadway can be identified and warned continuously as guide to the adjustment of supporting zone and parameters, safety management and an example for the similar engineering conditions.