Abstract:

Aiming at soil deformation caused by high-rise building load in the region where groundwater buried depth is more shallow, based on the Biot’s consolidation theory and combined with the nonlinear rheological theory of soil, the constitutive relation of soil was extended to viscoelastic plasticity, and the dynamic change relationship of mechanics parameters and hydraulic parameters with pore water pressure was also considered, a three dimensional finite element numerical model of land subsidence and upheaval deformation caused by high-rise building load was established. The characteristics of soil deformation that was affected by high-rise building load and variation characteristics of soil mechanics parameters and hydraulic parameters in this process were studied and analyzed in detail. It is shown that land subsidence caused by high-rise building load is funnel-shaped and the funnel center is high-rise building center. At the early stage of application of high-rise building load, land upheaval appears around building, and land upheaval disappears gradually after land upheaval reached the maximum value. The change trend of porosity,hydraulic conductivity and Poisson’s ratio of shallow soil under high-rise building performs an evolution of decreasing. But the change trend of modulus of elasticity performs an evolution of increasing.Porosity,hydraulic conductivity and Poisson’s ratio of shallow soil around high-rise building performs the tendency of increasing firstly and then decreasing. Modulus of elasticity performs the tendency of decreasing firstly and then increasing. The change trend of shallow soil parameters around the high-rise building is related to the upheaval and the compression of soil.

Key words: high-rise building load, groundwater seepage, land subsidence, upheaval deformation, Biot’s consolidation theory, three-dimensional full coupling model, parameter variation