Technology of Once Blasting Large Cross Section Roadway Heading and Surrounding Rock Control in Over 1 000 m Deep Underground Mine

In order to solve the slow heading speed of the high stress large cross section roadway and high difficult surrounding rock control of the roadway in over 1 000 m deep mine, a ground stress measurement, numerical simulation and site observation methods were applied to the study on the stress, displacement and plastic failure features of the mine large cross section roadway with the bench heading and once blasting heading and to the observation on the surface displacement of the mi ne roadway.The results showed that the once blasting heading roadway could avoid the blasting disturbance to the multi blasting disturbance and failure of the roadway surrounding rock, the deformation of the roadway surrounding rock could be relatively easy controlled and the construction technique would be relative simple.Thus the heading speed could be improved from 0.67 m/d to 2.00-3.00 m/d.