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《Journal of Dalian University of Technology》 2008-01
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Frequency domain analysis of dynamic response of underground structures embedded in nonuniform soil medium

LIN Gao*1,REN Hong-mei1,21.School of Civil and Hydraul.Eng.,Dalian Univ.of Technol.,Dalian 116024,China;2.State Key Lab.for Disaster Reduction in Civil Eng.,Tongji Univ.,Shanghai 200092,China  
Wave motion response of tunnel lining embedded in unbounded nonuniform soil medium is studied.The scaled boundary finite element method is employed to deal with this kind of problem.It has the advantages that only the boundary is discretized with finite elements,the radiation condition for unbounded medium is satisfied automatically and the general nonuniform medium can be analyzed without additional efforts.The wave scattering at the boundary of cylindrical circular cavity in 2D infinite space under horizontal incident SV waves was evaluated to validate the effectiveness of present approach.Stress distributions along the periphery of horse hoof-shaped tunnel lining were investigated.Several cases of nonuniform soil medium have been taken into consideration,i.e.the unbounded space with discontinuous interface of two media characterized with different shear modulus of elasticity and unbounded space with weak interlayer.Numerical results demonstrate that stress concentration is found in the vicinity of discontinuous interface of two soil media with different character and in the vicinity of weak interlayer.The larger the difference between the characteristic parameters of two soil media,the higher the degree of stress concentration becomes.In addition,stress concentration becomes more evident when the frequency of incident wave tends to be higher.This result has practical significance for the seismic design of underground structures.
【CateGory Index】: TU93
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