地下水恢复期逆作地下结构底板变形特征分析OA

During the natural recovery process of groundwater during the construction and operation of underground structures,the seepage of groundwater will cause complex changes of the pressure of the foundation base hole.The continuous increase of the pore pressure over time will cause deformation of the underground structure's baseplate.Therefore,relying on typical ultra-deep underground structures and considering the characteristics of heterogeneous soil layers distributed near the baseplate,a combined anti-floating method with underground structures,diaphragm walls and tension piles is proposed,a two-dimensional fluid-solid coupling model during the groundwater recovery period is established by the finite element analysis software PLAXIS;The base stress and deformation characteris-tics with or without uplift pile are compared to reveal the control effect of tension piles on underground structures during groundwater recovery.The research results show that the installation of tension piles has an impact on the base stress,deformation,and baseplate deformation characteristics.During the groundwater recovery period,the installation of tension piles can effectively control the adverse effects of groundwater recovery on the soil at the litho-logical boundary,which is beneficial for controlling the deformation of the foundation base.The differential defor-mation value of the foundation base at the lithological boundary becomes smaller.It can also improve the deformation and uneven differential deformation of the baseplate,reducing the uneven deformation value by 5.79 mm.