Analysis of Rock Pressure Behavior and Failure Characteristics of Surrounding Rock During the Shutdown Period of the Working Face
In order to grasp the rock pressure manifestation and surrounding rock failure characteristics of the retreat channel during the shutdown period of 15204 working face,numerical simulation and on-site monitoring methods were used to analyze and study it.The research results showed that as the working face advanced,the rock pressure manifestation of the retreat channel was obvious,and the surrounding rock stress continued to increase.When the distance between the working face and the retreat channel was 5.0 meters,the rock stress reached its peak,causing the phenomenon of rock fragmentation.The main manifestations are the fragmentation of the roof of the retreat channel,the fragmentation and collapse of the side roadway of the goaf,etc.,and it is necessary to strengthen the control of the surrounding rock before penetration.
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