关键词: 深竖井, 稳定性分析, 稳定性控制方法, 支护设计, 数值模拟

Abstract: In view of the limitations of the traditional theory and method of stability control of shallow shaft surrounding rock in application of deep shaft construction,based on the 1 500 m service shaft project of Sishanling Iron Mine,the stability analysis and control method of surrounding rock of deep shaft are explored.The self-support height without support and the stand-up time are used to analyze the stability of surrounding rock of service shaft in Sishanling Iron Mine,and the minimum self-support height is 22 m,the corresponding stand-up time is 125 days,the above of which can ensure the stability of surrounding rock during shaft sinking with 4 m sinking advance and 1~2 days cycle.However,it is still required to install support to ensure the long-term stability of surrounding rock during shaft excavation to service.Simultaneously,based on NATM and NMT,the theory of stability control of shaft surrounding rock which emphasizes making full use of the self-support capability of the surrounding rock is put forward,the stability control method of surrounding rock of deep shaft with the primary support (rock bolts,steel wire mesh and shotcrete) and the permanent support (concrete lining) is established.And accordingly,combined with the support design of the bedrock section of service shaft in the mine,the support design process of deep shaft is analyzed,and the support scheme of the bedrock section of service shaft is proposed.The safety of support scheme for the service shaft is verified by using Phase 2 software,which demonstrates that the stability control theory,method and support design method of shaft surrounding rock proposed in this paper is feasible for the construction of deep shaft.

Key words: deep shaft,stability analysis,stability control method,support design,numerical simulation