Research On Construction Technology And Stability Of Surrounding Rock In Lan Shan Tou Tunnel

With the rapid economic development of our country,traffic flow increases gradually,the existing road traffic supply cannot meet the transport demand growth, accelerate highwayand railway construction has become the key to solve the traffic problems in our country.Especially in recent years, some countries to promote economic development policiesproposed, such as the rise of central China, speed up the construction, revitalize the northeastold industrial base to speed up railway construction pushed to the forefront, and this is alsothe important factor of restricting the economic development of our country. This paper to theconstruction of Lishui City, Zhejiang Province,50provincial highway reconstruction projectLanshantou tunnel, using the theory of contrastive analysis, ANSYS numerical simulation andfield monitoring of construction technique of large section shallow tunnel, determined thetunnel construction technology rationality, the concrete research contents as follows:(1)The paper analyzes the construction technology and the main method of shallowtunnel with large section, the practical problem sand a combination of50provincial highwayreconstruction project Lanshantou tunnel engineering, analysis of the factors affecting theconstruction technology of tunnel, described a variety of tunnel construction technology.Through the establishment of index system of tunnel excavation, using the finite elementmethod, combined with the ANSYS numerical simulation of tunnel construction technologyscheme of the construction process of comprehensive evaluation, the construction technologyand the best solution.(2)Based on the analysis of the actual situation in the tunnel, the establishment ofthree-dimensional finite element model, to simulate the construction process, analysis ofsurrounding rock stress field，displacement field changing characteristics and changes instress support system of law, the stress field and displacement field distribution characteristicsand the distribution of the different stages of construction, rationality verification of thisconstruction technology.(3)Monitoring of reasonable monitoring plan, through the monitoring of the vault andthe surrounding displacement field in the process of construction, further construction schemeis reasonable theoretically provide data support.