某煤矿深部软岩巷道围岩破坏特征及控制技术研究OACSTPCD

Deep mining faces problems such as high geostress and difficulties in tunnel support.The failure of the support structure of-590 m horizontal transport roadway in a coal mine in Shanxi Province leads to large deformation of roadway and has a great impact on underground safety production.Aiming at the problems existing in the original support scheme,this paper proposes the idea of"anchor net cable integration"support,and studies the destroy characteristics and control technology of roadway surrounding rock by means of field tests,numerical simulations and industrial experiments.The research showed that:(1)The horizontal principal stress of the surrounding rock of the roadway was higher,reaching 39.08 MPa,which was the main reason affecting the stability of the surrounding rock.(2)By analyzing the stress field and plastic zone of surrounding rock around roadway with different support schemes,the vertical stress of optimized support scheme was reduced by 14% compared with the original scheme,and the range of plastic zone was reduced by 20% .The support effect of"integrated"scheme was better.(3)Industrial application has been carried out.Through the stress test of anchor ropes(cables),when the stress of anchor ropes and cables reached 53.9 kN and 389.12 kN.Compared with the original plan,the increase was 14.6% and 15.4% respectively,and the stress effect was better.The deformation of the roadway was controlled within 200 mm within 30 days,which was about 57% lower than that of the original scheme,and good support effect was achieved.The"integrated"support form can effectively control the deformation of the surrounding rock,which is a roadway with similar geological conditions.