Research On The Deformation Of Soil Induced By Shield Tunnel And Effect On Underground Pipelines

Shield construction has been the predominant in subway construction, the surface settlements and influence on surrounding environment induced by shield tunneling are the problems highly concerned in the design and construction process of shield tunnel. Urban tunnel often have to pass through underground pipelines, while underground pipelines is the urban lifeblood line, including feeding water, drainage, power, telecom, air feed lines and so on, shield tunnel constructions should guarantee lines'safety, So it ought to precisely calculate deformation of strata induced by shield construction, influence on pipelines stress status and displacement.In this thesis, aiming at research subject that Wuhan Yangtze River shield tunnel construction reflect on underground pipelines, adopting numerical analysis method, choosing underground pipelines of Peace avenue of Wu Chang as analysis object , with ABAQUS software to 3D numerical simulation possible dangerous pipelines induced by shield construction .In the process of building model, considering nonlinear of soil, lamination of soil, interaction of soil and liner, as analyzing influence on pipelines ,considering of main effect factors propelling force of shield, injected slurry pressure ,distance between working face of shield and pipelines, interaction between twin excavation tunnels, the bury depth of pipelines etc, summing up general law of disturbance and deformation of strata, excavating of left and right tunnel successively ,general law of displacement and suffering of pipelines, choosing reasonable parameter of the shield construction, compared with allowable value, judging its safety, bringing up protection measures of pipelines .The conclusion and suggestion of the thesis have theoretical connotation to shield tunnel construction and pipelines protection, can be used to refer and guide.