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针对液化土体大变形易引起沉箱码头破坏问题,基于有效应力分析法,采用Flac3D内嵌的Byrne本构关系为砂土液化模型,对1995年日本阪神地震中沉箱码头进行完全非线性有限差分数值模拟,分别从码头残余变形、超孔压比、应力应变等方面探讨沉箱码头地基液化特性和破坏机理。结果表明,该模型能较好地模拟可液化土体的动力特性,数值计算与震害调查结果较吻合,与置换砂土液化相比,回填砂土液化对沉箱破坏影响更大。
Aiming at the large deformation of liquefied soil, the problem of caisson pier destroys easily. Based on the effective stress analysis method, the Byrne constitutive model embedded in Flac3D is used as the sand liquefaction model. Based on the complete nonlinear finite difference numerical value of caisson wharf in 1995 Kobe earthquake in Japan, Simulation was conducted to investigate the liquefaction characteristics and failure mechanism of caisson wharf from the aspects of residual deformation, excess pore pressure ratio, stress and strain. The results show that the model can simulate the dynamic characteristics of liquefiable soil well, and the numerical calculation is in good agreement with the seismic damage survey results. Compared with displacement liquefaction, the liquefaction of backfill sand has a greater impact on the destruction of caisson.