Abstract:
In this paper, the asymmetric support scheme of prestressed yield pressure is proposed based on the problem of the stress distribution of surrounding rock and the uneven deformation of the roadway in 1103 transportation lane of Guotun Coal Mine. Through theoretical analysis, numerical simulation and engineering observation, the failure mechanism of surrounding rock in dynamic pressure roadway is analyzed. And the support parameters of the anchor net are studied. The best support scheme is obtained and applied to engineering practice. The results show that: pre-stressed yield bolt is close to the yield limit of bolt, which can bear the load quickly to ensure that the bolt system does not have plastic damage; the prestress of the designed high strength prestressed anchor is 60 kN; 5 roof bolts and 4 upper bolts are arranged; the position of the anchor cable is biased toward the side of the air. The design support scheme greatly improves the original support state and controls the stability of the surrounding rock of the roadway. The unsymmetrical stress distribution of roadway surrounding rock is controlled in the range of basic symmetry of deformation.