Tunnel Entrance Slope Stability Analysis And Related Support Measures Reasonable Research

Slope instability of tunnel entrance is a common accident in tunnel construction. Only the security hole can smoothly follow the construction, so how to ensure the entrance and the stability of slope is of primary importance in tunnel construction.The intention of this task is to study the stability of tunnel slope and entrance,through analysing a large number of slope tunnel entrance,and participating in Shaoshan in person at the tunnel construction,and learning from the past successful experience of slope stability analysis,.In the study, mainly analysing and judging the slope failure modes, safety factor of slope,and the role of system bolt and pipe of tunnel entrance by numerical methods.Then combine with field monitoring data, make constructive comment to the slope stabilization measures,supporting programs and rationality of tunnel entrance.The thesis is divided into five parts, the first part mainly discusses the status quo and development trends of slope stability,and provides the purpose of this research topic, method and content; The second part mainly discusses the sliding surface position by calculating, and the effects of slope rate,homogeneous slope and seepage on the sliding surface; The third part maily introduces the numerical software, and discusses the distinction by modeling calculations between no bolt support and bolt support,so as to arrive at the need for bolting,applications range and rationality in the case of ahead pipe support; The fourth part mainly discusses the difference of the displacement and internal force between ahead pipe support and no pipe support by modeling calculations,in order to confirm the role of pipe in the case of system bolt support;The fifth part lists the tunnel project and the monitoring measuring data of Shaoshan tunnels, and compares with numerical simulation.