Abstract:
Aimed at the technoligical problems of the deep mine roadway with high ground stress, from the view of stress control, a new technique of stress transfer to control the surrounding rock of roadway is proposed. Through high stress deep-hole grouting in the deep roadway surrounding rock ( from 2 to 15 m ), a layer with high strength and larger elastic modulus is formed. Through the loading layer priority to support the concentrated stress that produced by overlying strata subsidence in the surrounding rock to make the concentrated stress transfer to deep part, it ensures the integrity and stability of surrounding rock. Using FLAC
3Dnumerical simulation to study the effect of stress transfer, the results show that the technology can significantly reduce the concentrated stress near the surrounding rock of roadway, and make the stress reduce by 20% to 30%, and the peaks transfer to depths of 2 m or so. The method can effectively reduce the displacement of roof and floor of roadway, control the deformation of the surrounding rock, solve the support, maintenance problems of high stress roadway to a certain extent.