Analysis On Pre-consolidation In Large-section And Weak Surrounding Rock Tunnels

Tunnel construction technology in China has been rapid development, Has becomethe country built the largest number tunnel and the fastest growing technology in theworld. In the tunnel engineering development process, Tunnel engineers and techniciansto learn from foreign advanced technology and introduction of the New AustrianTunneling Method, Norway method, TBM method and so on. For our country complexgeological conditions, Creatively proposed Shallow Mining Method and The water-richkarst tunnel release and buck method. Promote the progress of the world tunnelconstruction technology，However, there are still some problems in the large section ofweak surrounding rock tunnel without thorough research.In this context, combined with a tunnel project instance of extensive research, referto the basis of the relevant literature on research advance support of the weak andbroken rock large section tunnel effect. The study mainly includes the followingaspects:①More comprehensive analysis of the tunnel design and construction of the newAustrian law theory at home and abroad as well as in soft rock tunnel exposed someproblems.②Comprehensive overview of several basic factors of weak rock tunneldeformation characteristics and the impact of weak surrounding rock deformation andstudy on the factors.③The system introduced a large sectiontunnel used several construction methods,as well as the advantages of each method.④Detailed introduction in our country in recent years, a new tunnel design andconstruction methods-NITM. Summarized its definition of the design concept andadvantages compared with other design methods, and how to use NITM guidance tunnelconstruction and control of the deformation response of the surrounding rock.⑤Combined with the tunnel project instance, the use of the GTS finite elementsoftware numerical simulation of the pipe shed grouting advance support, its supportingeffect evaluation. Show that the pipe roof grouting method can effectively advancesupport the control surface subsidence, vaulted sinking. Able to meet the requirementsof the project.