真空预压法三维有限元计算规模探讨  

Study on calculational scale of 3-D FEM Model for vacuum preloading

作　　者：陈平山[1] 董志良[1] 张功新 

机构地区：[1]中交四航工程研究院有限公司,广东广州510230

出　　处：《水运工程》2009年第12期28-31,共4页Port & Waterway Engineering

摘　　要：为研究真空预压法三维有限元计算模型规模对结果的影响,利用比奥固结理论,考虑了井阻和涂抹效应,对广州南沙港某真空预压区建立了3个不同大小的有限元模型,并将计算结果与实测数据进行比较。结果表明,计算模型由于存在边界效应,其规模的大小会影响地基变形值;当模型规模增大到一定时,变形将不再受其影响;有效加固深度主要集中在塑料排水板打设深度范围内,侧向位移在边界处的影响深度可达到25m;加固区土体内的孔压消散几乎与计算规模无关。To analyze the influences induced by the calculational scale of 3-D FEM model for vacuum preloading, considering the well resistance and smear effects, three models of different scales were set up with Biot consolidation theory and numerical analysis was executed on the vacuum preloading engineering in Guangzhou Nansha Port. The results showed that the scale of models would influence the ground deformation caused by boundary effects and the influence would be little when the model reaches to a certain scale; the efficient improved depth was mainly in the range of the prefabricated vertical drains and the influenced depth of lateral displacements on border reached 25 meters; the model scale had little impacts on the dissipation of pore-water pressure inside the improving ground.

关 键 词：真空预压 三维有限元法 计算规模 沉降 

分 类 号：TU447[建筑科学—岩土工程]