Study On Surrounding Rock Movement Law Of Gob Side Entry With Rock Burst In Fault Area

When the working face is pushed to the fault affected area,the variation degree of surrounding rock structure and the risk of fault activation increase,and the risk of regional rock burst increases.Based on the actual engineering conditions,this paper studies the surrounding rock movement law of gob side entry in fault area,and forms the following research results:(1)Based on the similar simulation test,the surrounding rock movement of upper drift is studied.The results show that: with the face pushing mining,the distance between the upper roadway and the fault decreases,and the influence range of mining advance gradually increases;The stress concentration degree of the surrounding rock of the upper drift increases gradually;The deformation of surrounding rock of upper drift increases(2)The calculation formulas of overlying abutment pressure and overlying rock pressure of gob side entry are established.The analysis shows that the fault abutment pressure and the lateral abutment pressure of the solid side of the upper roadway go through three stages: no superposition,superposition and height overlapping.With the push mining of the working face,the stress concentration degree of the surrounding rock of the upper roadway gradually increases.(3)The deformation characteristics of surrounding rock in different stages of pushing and mining are obtained by numerical simulation.The upper roadway was seriously damaged and deformed when he saw the square at one time.When the working face continues to push,the deformation amount and deformation range of surrounding rock in the upper roadway increase with the decrease of the distance between the roadway and the fault.When the working face is square twice,the deformation and failure degree of the upper roadway beyond the front section is stronger than that of the first square.(4)The comprehensive research shows that with the working face pushing mining in the fault affected area,the surrounding rock of the upper roadway is affected by the superposition of fault abutment pressure,lateral abutment pressure and advance abutment pressure,which increases the stress and deformation of the roadway,and plays an auxiliary role in the mining range of the fault body.