Research on bolt,anchor cable,steel strap and mesh combined support technique applying to Daxing Coal Mine for soft-rock tunnel

According to the rock characteristic and coal seam occurrence condition of 3208 material tunnel roof at Daxing Coal Mine, combining with modern theory of coal tunnel support technology, the combined support parameters of bolt, anchor cable, steel strap and mesh for the tunnel, are put forward; and daily tunnel pressure and support observation, such as roof separation, tunnel convergence deformation, anchorage stress of bolt (anchor cable) etc. have been done at a long time. The results of try-on and observation indicate that the application of bolt, anchor cable, steel strap and mesh combined support technique at Daxing Cola Mine soft-roof tunnel is successful and feasible. Suggestions about the support way of tunnel in samdwich and joint and cracked fake top are also presented.