【摘要】 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。更多还原

【Abstract】 The large deformation of soil liquefaction can lead to destruction of the caisson wharf.Based on the effective stress analysis method,Byrne constitutive model for sand liquefaction built-in Flac3D is used to make a fully nonlinear finite difference numerical simulation of the caisson wharf during the 1995 Kobe earthquake in Japan to explore wharf foundation liquefaction characteristics and failure mechanism from residual deformation,the excess pore water pressure reaction and stress-strain respectively.The results show that Byrne model is capable of simulating liquefied soil dynamic characteristics;numerical calculation results are consistent with the damage survey;it is more influence of backfill soil liquefaction than replacement sand to caisson wharf failure.更多还原