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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。
Based on the Biot consolidation theory and considering the nonlinear seepage deformation characteristics of soft soil in Shanghai area, Burgers constitutive model is applied to analyze the ground subsidence caused by groundwater drainage in Quaternary unconsolidated sediments in Shanghai. The groundwater seepage field and stress field Full coupling, a three-dimensional viscoelastic fully coupled mathematical model of groundwater drainage and land subsidence has been established. Taking the finite element numerical analysis method as an example, taking the foundation pit dewatering in the tower of Shanghai World Financial Center as an example, the change law of underground water level and land subsidence caused by confined water precipitation is analyzed in detail. Based on this, The results of groundwater level and ground settlement around the pit are compared with the measured results. The results are in good agreement with each other, which is of great guiding significance to the design and construction of precipitation and its impact on the surrounding environment in similar major projects.