Study on Ejection and Breaking Mechanism of Anchor Cable and Protection Schemes

Anchor cable is easy to break due to the shear force caused by diastrophism of roof stratum and the rush increasing axial tension caused by lateral-deformation of surrounding rock during mining with anchor cable supporting of roadway. The damage of tensile failure is much greater than the shear failure of anchor. The potential energy of anchor is considerably large when it was tensely broken. Meanwhile, if the broken parts of anchor are not clamped by the coal rock mass, it is easy to be ejected, and which will threat the safety mining. Aimed at the problem that the working face of Nanyao Xiaochang Mine often has breaking ejection of anchor, the breaking form, mechanism and ejection mechanism of anchor is researched and the ejection protection scheme of anchor cable is proposed.