Surrounding Rock Failure Mechanism and Technology of Grouting Reinforcement in Winch Chamber

In order to solve the surrounding rock failure problems of winch chamber in No. I 1 mining area of Yangzhuang Mine, such as, two sides getting closer, severe skin falling off the roof of pulp and serious floor heave, through the surrounding rock mineral composition analysis experiment, field test and theoretical analysis, the paper studied the failure mechanism of the surrounding rock, and then the scientific and reasonable secondary reinforcement scheme were put forward. The study「 esluts showed that unreasonable supporting structure and parameters and a lot of clay mineral components were two main causes for the failure. Through the theoretic al calculation and analogy analysis, the paper put forward the secondary anchor reinforcement scheme by using rock bolt 1 mesh 1 shotcrete combined with grouting. Th e field application showed that the maximum convergences of roof- to- floor and rib- to- rib respectively were 40 mm and 55 mm after adopting the study plan, and the w inch chamber deformation would be gradually stable.