Chamber Deformation Failure Analysis and Secondary Grouting Reinforcement Technology in Bao'an Coal Mine Substation

Taking Bao'an coal mine substation as the research object, through the ground stress observation and analogy analysis, the paper studies the reasons of the substation deformation and failure, and countermeasures of substation secondary reinforcement scheme are put forward. The study shows that large buried depth and the ground stress that close to the vertical roadway trend are the main reason for the destruction of substation, and different kinds of natures of roof and floor of surrounding rock are direct reasons resulting in the different degree and deformation and failure increasing in different positions, small coal rock pillars is an important factor leading to deformation of surrounding rock. Through the theoretical research and analogy analysis, the paper puts forward the secondary anchor reinforcement scheme by using bolt-grouting inverted arch to combine with coal rock pillars to wear anchor cable. Through the practice, it can achieve the roadway reinforcement, control the roadway deformation of substation, which ensures the use of substation.