| Coal carries a high proportion in the using energy in our country. However, with many years of mining, coal buried shallowly is almost exhausted, and the mining for coal need to be operated in deeper seams. Deep rock is often affected by mining disturbance and high temperature, pressure and osmosis, and the structures of some roadways are complex, and these bring great difficulties in roadway support. In this paper, theoretical analysis, numerical simulation and field observation and other methods are used to study the deformation mechanism and supporting method of deep isolated rock bodies under dynamical pressure, and the obtained research findings are as follow:(1)The deformation characteristics of deep roadways are analyzed, and the displacement and stress field of roadways under dynamical pressure are analyzed by elasticity and plasticity theory. By means of numerical simulation method, the deformation features of the isolated rock body region are analyzed, and the deformation conditions of the intersections and the stress conditions of the isolated rock pillar are presented.(2)The mechanical model of the isolated rock pillar is established to analyze its deformation mechanism. The finite element simulation method is used to analyze the support effect of double-control anchor rope in the rock pillar and bolt and anchor truss in three-dimension in the roadway.(3)By means of numerical simulation, the support effect of double-control anchor rope and bolt and anchor truss in three-dimension in isolated rock bodies is analyzed, and combined with the field measurement, the method proves to be effective in the support of isolated rock body regions. As to the floor heave, the control capabilities of prestress anchorage cables and bolts in the roadway floor of isolated rock body are simulated.The research results can provide reference to roadways in similar structures and complicated conditions. |
PDF Full Text Request