Analysis Of Structure Stress And Deformation In Water And Mud Burst Of Lingjiao Tunnel

With the rapid development of highway transportation in our country, the constructionof the road more and more, and in the mountains, the tunnel becomes the first choice formany designers. But some of the complicated geological conditions for the design andconstruction of the tunnel have brought many difficulties. Some in the layer fracture zone, thebearing capacity of the rock mass is low, poor stability and has the collection of groundwater.Tunnel are prone to pour water, mud, landslides and other disasters so that to impact on theprogress of project, even can cause construction safety. Not only can’t the current engineeringquality be guaranteed, but also can the operation of the late be affected. Therefore, it isnecessary to study tunnel structure stress and deformation of pour water, mud and other badgeological section.The thesis, based on high-speed hill foot tunnel from Cenxi to Shuiwen, will focus on aanalyze study on the stress and deformation characteristics of pour water and sudden mudstructure, and will evaluate the safety of the supporting structure.First of all, the thesis introduces the engineering situation of the water, the sudden mudsection and treatment measures. Then, it is tested for the displacement and stress of tunnelstructure, chooses test elements such as buried pressure box of water, sudden mud period oftypical section, surface strain gage, concrete strain gauge and reinforcing steel bar meter. Themeasurement content includes vault sink, peripheral convergence, the surrounding rockpressure, steel stress, anchor axial force, the contact pressure between initial support andsecondary lining and secondary lining stress, etc. The analysis of test data shows that thestress and deformation characteristics of surrounding rock supporting system, and calculatesprimary support and secondary lining ratio.Secondly, the thesis calculates three-dimensional numerical simulation usingMIDAS/GTS, the finite element analysis software, and analyses the initial supportingstructure stress and deformation in theory, and contrastive analysis calculation results of thefield monitoring measurement and numerical simulation.Finally, the thesis carries on the safety evaluation of tunnel support structure. Monitoring and calculation results show that the tunnel water gushing, sudden mud segmentridge foot treatment measures meet the requirements of the tunnel construction. The regionhas enough safety store, which is in a reasonable range of vault sink in and around the regionof convergence, the primary support and secondary lining stress safety, and good workingcondition.