Study On The Surrounding Rock Deformation And Mechanical Character Of Support Structure For The Shallow Burying And Bias Tunnel

Along with the development of the construction of highway tunnel, for theconstruction of the problem in the study also in the corresponding development.Relyingon chengkou to wanyuan fast channel tunnel project，briefly introduces the generalsituation and the construction of the shitang tunnel construction practice the problemsneeded to be considered. Through the tunnel shitang site monitoring data, and combinedwith elastic-plastic finite element numerical simulation, shallow buried bias of thetunnel construction stage deformation and supporting structure of surrounding rockstress characteristics analysis and research:①Introduced the characteristics of shallow buried bias tunnel and surroundingrock deformation characteristics and the influence factors of the tunnels for vault sinkchangshan and peripheral level convergence monitoring, to reflect the construction andexcavation method and the rationality of the supporting measures.②According to the tunnel shitang site monitoring material, detailed analysis of thetunnel excavation period after shitang of the surrounding rock deformation andsupporting structure stress characteristics. The analysis results show that: shitangshallow buried tunnel of surrounding rock deformation for bias convergence hasstronger time-space distribution characteristics, in effect of the time, mainly for initialdeformation and deformation large quantities as well as fast development characteristics,in space, the performance of different section of tunnel monitoring have differentdeformation features, deformation has obvious not uniformity; Second, the surroundingrock pressure characteristics also manifests as a stronger time-space distributioncharacteristics, primary support surrounding rockmass pressure time history ofperformance for the initial press, initial quick pressure, confining pressure period longcharacteristics, in space, mainly for the same section has a different pressure features,and different degrees of existence bias phenomenon.③Briefly expounds the finite element simulation tunnel construction process basicprinciple. By using the finite element software ANSYS11.0, shitang to construction ofthe tunnel process of the finite element numerical simulation, the research analyzes thedistortion of surrounding rock stress and supporting structure. Will the results ofnumerical analysis with the actual monitoring conditions contrast and conclude thetunnel construction of shitang choose excavation and supporting method is reasonable.