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《Journal of Wuyi University(Natural Science Edition)》 2012-01
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A Finite-element Numerical Simulation Study of the Reinforced Soil Stability of Aquifer-free Shield Starting Zone

HU Jun1,YANG Ping1,ZENG Hui1,2,XIE Da-wei3(1.College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China; 2.School of Civil Engineering and Architecture,Wuyi University,Jiangmen 529020,China; 3.Nanjing Section of Shanghai Railway Bureau,Nanjing 210015,China)  
Shield starting is an accident-frequent phase in the construction of shield tunnel and ensuring the stability of reinforced soil in this phase is a key and urgent problem.In this paper,first,frequently-adopted methods for reinforcing the soil at the shield tunnel ends were summarized,then by combining the case of shield launching project(aquifer-free) of one station's west end in Suzhou Subway,a numerical simulation program was applied to conduct simulation analysis of reinforced areas at shield starting shafts under the most unfavorable construction condition—with the sealed door removed.According to numerical simulations,when the longitudinal reinforcement length reaches 3 m,the soil shall move towards the working well in the tunneling direction of the shield tunnel,and the maximum displacement occurs in the center of exposed tunnel face,up to 12.92 m.Surface soil above the sealed door becomes deformed most,settling by approximately 3.0 m and soil within the strong reinforcement area is stressed within designed strength range,and the safety factor is 2.05,1.47 and 1.30 respectively.At the shield starting shaft which is aquifer-free,if the longitudinal reinforcement length reaches 3 m,requirements in both strength and deformation can be met.
【Fund】: 苏州市科技局苏州轨道交通专项课题(zxj0802)
【CateGory Index】: U455.43
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