摘要
针对上海地区第四纪松散沉积层地下水疏降所引发的地面沉降问题,基于Biot固结理论,考虑上海地区软土的非线性渗流变形特征,采用Burgers本构模型,将地下水渗流场与应力场全耦合,建立了地下水疏降与地面沉降三维黏弹性全耦合数学模型。采用有限元数值分析方法,以上海环球金融中心塔楼基坑降水为例,详细分析了承压水降水引起的基坑内外地下水位和地面沉降的变化规律,据此获得减压抽水井运行30d时基坑周围的地下水位与地面沉降量,并与实测结果进行了对比,其结果比较吻合,对类似重大工程的降水设计、施工及其对周边环境影响的分析具有重要的指导意义。
To analyze the land subsidence caused by the dewatering for deep excavation in quaternary loose sediments in Shanghai,a model based on the Biot's consolidation theory was established.Then the Biot's consolidation theory was extended and applied to non-linear questions.A 3D viscoelastic coupling-model of seepage and stress was established considering the non-linear characteristics at different stress states,in which the Burgers model was adopted.The 3D FEM was applied to Shanghai Huanqiu Finance Center foundation pit to simulate and analyze the characteristics of the groundwater level and land-subsidence around the foundation pit due to the dewatering.Accordingly the groundwater level and the land subsidence quantity around the foundation pit were achieved when the pumping wells had run for 30 days,and they were compared with the measured data,showing a significant meaning for similar projects.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2008年第S1期41-45,共5页
Chinese Journal of Geotechnical Engineering
基金
上海市重大科研基金项目(建科2007-014)
关键词
深基坑降水
地面沉降
三维全耦合模型
黏弹性
数值模拟
dewatering of deep foundation pit
land subsidence
3D coupling model
viscoelasticity
numerical simulation
