Study on stress transmission laws of mining floor and its influence on stability of floor roadway

摘要

According to distribution form of abutment stress in a stope, the 762 working face of Haizi Mine taken as for example, mechanical model of mining abutment pressure transmission in floor is proposed based on the theory of semi-infinite plate body in elasticity, the dynamic evolution law of seam floor stress during the mining process are analyzed and mining floor stress and surrounding rock stress are organically combined, change laws of the maximum principle stress and minimum principle stress of floor roadway surrounding rock with overlying face mining are obtained, mechanical model of roadway stress is built under the non-constant pressure force state and cracks revolution mechanisms of floor roadway surrounding rock when the 762 working face mined are explored and analyzed.Through numerical simulation, the results show conclusion is reliable.This model could provide basically theoretical and technological support for floor roadway surrounding rock control.