Research on prestressed cable parameters optimization designs and its application to Jinchuan Mine No.2

Considering the support difficulty of the roadways with high stress zone in Jinchuan Mine No.2,a prestressed cable support technique is studied and adopted at 1 178 m sublevel in Mine No.2.The prime support parameters were first given with the help of engineering experiences.Then orthogonal numerical experimentation regression analyses were executed.The results show that pretressed cable with the length of 6.5 m should be used in the Ⅲ or stronger grade(with RMR of 40) surrounding rock or the tunnel affected by the mining lightly,as for the tunnel suffered from the mining seriously,cable supporting with length of 6.5 m can make the safety coefficients reach 1.28,therefore,cable with length of 5.5-6.5 m can meet the stability need of sublevel tunnel.