Research In Original Rock Stress State For The Cross Roadway

Since the reform and opening up, China’s economic construction in a new period of rapid and comprehensive development. The demand for coal is also showing a growth trend, but coal mine safety accidents also appeared in an upward trend, so ensure high energy efficient production of coal mine safety is imperative.In order to ensure the safe and efficient production of coal mines, meet the actual needs of under-mine coal, ventilation, etc, the roadway cross is inevitable, the intersection point of stress concentration are in serious condition, The tunnel roof and the walls of tunnel bare areas are very great, causative the intersection roadway surrounding rock deformation failure is very serious, supporting work is very difficult. these seriously restrict the coal mine safety in production.In this paper combines with the intersection roadway in HeBei province, based on the theory, surrounding rock in supporting theory, the supporting method, tunnel design and the classification of surrounding rock are described in detail.We analysis the surrounding rock stress and destruction features and tiberium spikes supporting of roadway load by FLAC3D numerical simulation analysis software. Based on this, the paper puts forward some opinions in supporting designin of cross roadway and the reinforcement of the surrounding rock.In the simulation analysis of FLAC3D,we can get Cross area of roadway surrounding rock stress change characteristics、the first response when excavating tunnels and the maximum load that the tiberium spike can withstand and so on.The results of the study have a important theoretical significance and the certain reference value to the surrounding rock supporting about Cross roadway in Underground tunnels.