Analysis of excavation method of large span open-off cut in deep mine

作者：Kan Jia Guang^*; Zhang Nong; Li Gui Chen; Wang Cheng; Zhang Dong Hua

来源：Journal of Mining & Safety Engineering, 2009, 26(2): 163-167.

• Deep mines
• Excavation methods
• Floor heave
• High strength bolts
• Large span
• Large span in deep mine
• Plastic area
• Stability of surrounding rock
• Strata behavior regularity
• Stress distribution
• Support systems
• Supporting systems
• Surrounding rock
• Surrounding rock deformation
• Three times tunneling
• Tunneling ,
• Working face

In order to master the effect of construction condition on stability of surrounding rock of large span open-off cut, we numerically simulated the characteristics of stress distribution and surrounding rock deformation of the open-off cut under the construction condition of oncetunneling, twice tunneling, and three-times tunneling so as to solve the problem of large span open-off cut in deep mine of Xieyi coal mine in Huainan. The result shows that 1) both the once tunneling and twice tunneling have a small floor heave and a great roof convergence, so the stress in the area surrounding open-off cut is highly concentrated, forming a large plastic area in surrounding rocks; and 2) the three-times tunneling has a small roof convergence and a small plastic area in surrounding rocks, so it is favorable for the stability of surrounding rocks. According to this excavation method in large span open-off cut (8.4 m) of 511C(3) working face, the support system of high strength bolt and anchor was used to maintain the stability of open-off cut, making the roadway deformation be controlled within the allowable range and the structure of bolt-net supporting system reliable.

• 出版日期2009
• 单位中国矿业大学（北京）