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针对城市化进程中高层建筑不断增加,由地下水开采和高层建筑荷载叠加作用共同引发的地面沉降问题,以比奥固结理论为基础,结合土体非线性流变理论,将比奥固结理论中的本构关系推广到黏弹塑性,并考虑孔隙度、渗透系数、土体变形参数随有效应力的动态变化关系,建立高层建筑荷载、地下水渗流与地面沉降有限元数值模型,详细研究了地下水开采及高层建筑荷载叠加影响下的地面沉降特征.结果表明:地下水开采和高层建筑荷载叠加作用下的地面沉降存在耦合效应,由地下水开采和高层建筑荷载叠加作用引起的地面沉降值小于同一条件单独抽水和仅存在高层建筑荷载作用下地面沉降值之和.耦合效应随着地下水开采层位埋深的变大而减弱.沉降初期,线性叠加效应明显,随着时间的延长,耦合效应趋于稳定.
Aiming at the problem of land subsidence caused by the continuous increase of high-rise buildings, the groundwater exploitation and the superposition of high-rise buildings in the process of urbanization, based on the Biot consolidation theory and the soil nonlinear rheological theory, the Biot consolidation theory The constitutive relation in this paper is generalized to viscoelasto-plasticity. Considering the dynamic changes of porosity, permeability coefficient and soil deformation parameter with effective stress, a finite element numerical model of high building load, groundwater seepage and land subsidence is established. Mining and high-rise building load.The results show that there is a coupling effect between groundwater subsidence and ground subsidence caused by the superposition of high-rise building load.The ground subsidence caused by the superposition of groundwater mining and high-rise building load is less than the same condition alone Pumping and the sum of land subsidence only under the load of high-rise building.The coupling effect decreases with the increase of buried depth of groundwater exploitation.The linear superposition effect is obvious at the initial stage of settlement, and the coupling effect tends to be stable with time .