The Stability Control Countermeasure of Surrounding Rock in Deep Squeezing Soft Roadway

-848 m deep main belt machine roadway in Huainan Panyidong coal mine is a typical deep high stress squeezing soft roadway. Site investigation, FLAC^3D numerical simulation, squeezing deformation grade evaluation all show that the surrounding rock produces very serious squeezing deformation after excavation, mainly performs as large deformation, high deformation rate, small convergence rate, significantly timeliness characteristics, difficult control of roadway stability. The paper analyzes the main influencing factors of squeezing deformation, including geo-stress, lithology, disturbance of roadway group, floor instability, etc. According to the main squeezing deformation characteristics of main belt machine roadway, based on the stability of surrounding rock control theory and "step combined support" theory, the paper establishes control countermeasures. Through numerical simulation and field monitoring, the effect of the support method is verified. The results show that the deformation rate of surrounding rock is reduced significantly, and the deformation tends to convergence in a relatively short period of time after this supporting scheme. The supporting scheme's supporting effect is good, which can effectively control surrounding rock extrusion large deformation.