Abstract:

With the gradual deep exploitation of the mine, the surrounding rock mass in the roadway has such characteristics as high ground pressure, large distortion and  is difficult to support, which can cause difficulties to control the distortion of surrounding rock with anchor-net support and not be able to meet the demand of safe production. By means of a study on failure mechanism of the 1100 horizontal roadway in the  Huafeng coal mine, the conceptions of U-shaped supporting section and closed support were put forward, and the carrying capacity of floor and the resistance to creep of roadway were strengthened. According to the research on rheological characteristics of surrounding rock mass in a kilometer deep mine, a longer time and distance can be obtained for permanent  support, while the ground pressure around the roadway was released and became stable. Then the incompact rock block was  consolidated to unity with anchoring and grouting in permanent support, and the cohesive strengths and internal friction angles of the surrounding rock were also improved, which make the surrounding rock mass change from soft to hard and nosupported effect to support structure.Meanwhile, the bole  strengthened and the reinforcement effect achieved the purpose of  permanent safety support for the  roadway.

Key words: soft rock roadway; failure mechanism;secondary support;anchoring and grouting