筒型基础负压沉贯的物性参数动态模型

分析筒型基础负压沉贯的特点,首先,由有效应力原理和瞬时质量守恒原理确定了渗流方程和应力场方程;其次,建立了新的土颗粒本构关系,利用J2流动理论及各向同性硬化原理计算土体颗粒在渗流力作用下的弹塑性变形,利用离散元法求解土体骨架的体应变;然后,在此基础上导出了筒型基础负压沉贯流固耦合的孔隙度、渗透率等动态物性参数模型;最后,利用导出的模型进行了实例计算,检验了模型的理论性.

Dynamic physical parameter model of bucket foundation suction penetrqtion

The characters of the bucket foundation penetrated are analyzed.First,the stress equation is established by the principle of effective stress,and the flow equation is established by the instantaneous law of conservation of mass;second,the new constitutive relationship of soil particulate has been solved,the elastic-plastic deformation of soil particulate under flow force has been solved by applying the principle of J2 flow theory and isotropic,the volumetric strain is solved by the discrete element method;thus,the dynamic physical parameter model of porosity and permeability of bucket foundation suction penetration on account of fluid-structure coupling effect has been established on the basis of the volumetric strain;finally,the theoretic of the model is validated by numerical simulations of the sample using the educed model.