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Model Test and Numerical Simulation of Segment Lining for Nanjing Changjiang Tunnel

Author: YangXiong
Tutor: HeChuan
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Large sections of shield tunnel High pressure Model test Pipe lining Structure calculation and analysis
CLC: U455.91
Type: Master's thesis
Year: 2007
Downloads: 347
Quote: 7
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Abstract


Shield tunnel has been widely used in urban underground railway construction, urban construction, large cross-section , high- pressure , long distance shield tunneling is an urgent need to address the issue. Nanjing Yangtze River Tunnel φ14.5m thesis oversized sectional segment lining for the object, using geometric similarity ratio C_L = 25, bulk density similar ratio C_γ = 1 ratio based on similar indoor model test and numerical simulation of tube sheet structure as research tools effects of different ways in different segments assembled water, soil pressure and mechanical characteristics under high pressure conditions, single- tube lining damage morphology . Developed a non-uniform model test pressure devices , hydraulic loading considering uniform pressure on top of the tunnel , pipe lining structure itself generated non- uniform size of the combined effects of pressure to achieve a model test load of water , soil pressure , respectively control for in-depth study of water, soil pressure on the pipe lining provides an important support role . This paper studies the content is as follows: ( a ) under controlled conditions of each calculation conditions provided for different way of assembling the pipe lining structure simulated by internal forces and deformation control design values ??, and validate the model test results accuracy . ( 2 ) Study on top of the tunnel under different pressure pipe lining structure and mechanical characteristics of variation . ( 3 ) Study of Different Casing height , different lateral pressure coefficient of earth pressure on the tube sheet structure the role of formation conditions on the tube lining structure. ( 4 ) comprehensive comparison of seven kinds of lining assembly mode conditions in the mechanical characteristics of the effects of different way of assembling the mechanical characteristics of segment lining , choose the best way of assembling . ( 5 ) In the 50m high pressure conditions on the tube segment lining loaded destructive testing , access to computer simulation can not characterize the failure modes .

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