东人工岛软弱地基蠕变变形研究  

Soft ground's creep deformation of eastern artificial island

作　　者：王孝健[1] 张曦[1] 吴心怡[1] 

机构地区：[1]中交上海三航科学研究院有限公司,上海200032

出　　处：《水运工程》2016年第3期145-148,共4页Port & Waterway Engineering

基　　金：国家支撑计划课题项目(2011BAG07B00;2011BAG07B02)

摘　　要：基于东人工岛现场实测数据,利用双曲线法对地基土长期变形进行预测分析,简化局部地层分界线,选取Burgers本构模型,利用有限差分法对软弱土体的主固结沉降和蠕变量进行计算,得到了东人工岛软弱土体工后5、10、50、120 a的蠕变沉降量。同时,通过有限差分法确定了蠕变计算时Kelvin模型与Maxwell模型的黏滞系数和剪切模量。通过与实测沉降数据进行对比,软弱土体的蠕变沉降不可忽略。Based on the field test data, we predict the long-term deformation of foundation soils by the hyperbola method. Burgers constitutive model is selected by simplifying the regional stratigraphic boundary. In addition,the creep and primary consolidation settlement are calculated by the finite difference method. The creep settlement of soft soils after construction for 5,10,50,120 years are obtained. Meanwhile,the viscous coefficient and shear modulus of Kelvin and Maxwell model are also achieved. By comparison between the calculated and measured data,the creep settlement of soft soils shouldn＇t be ignored during the engineering design and construction.

关 键 词：软弱地基 蠕变沉降 港珠澳大桥 水下挤密砂桩 

分 类 号：TU375.1[建筑科学—结构工程]