The Main Control Factors and Pressure Relief Scheme for Rock Burst in Xiaozhuang Coal Mine
Aiming at the problem of rock burst disaster in the 40214 working face of Xiaozhuang Coal Mine,the potential risk of rock burst is evaluated from geological factors such as geological structure,roof characteristics,mining depth,coal rock impact tendency and others,as well as mining main control factors.The mechanism of nurturing and causing disaster of rock burst main control factors is studied,and the causes and forms of rock burst damage are classified into three categories by using the induced mechanism of rock burst dynamic and static load superposition.The dynamic and static load monitoring method is adopted,and a three-level collaborative pressure relief danger relieve scheme of rock burst"drilling-explosion-cracking"is implemented on site,using large-diameter drilling for pressure relief,coal seam water injection for pressure relief,and coal seam unloading blasting,respectively.The results show that the bending energy index of the roof is 38.42 kJ,the uniaxial compressive strength of the coal body is 18.11 MPa,the elastic energy index of the coal body is 14.95,the dynamic failure time of the coal body is 172.80 ms,and the impact energy index of the coal body is 1.56,which has a weak impact danger.This provides a reference idea for solving the rock burst problem in same type of mines.
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