Dynamic Loading of Partially-Saturated Soil: an investigation in the framework of numerical mechanics of strongly coupled problems

复杂的基础以及在现有环境中建造时所需的基础技术（如打桩或振动）都必须基于对新兴建筑和“整体系统底土”相互作用的详细调查。考虑到这些特征，必须考虑静态和动态载荷条件。这些荷载作用在地基上，并可能导致大的变形。承受这些载荷是由底土的各种成分的相互作用引起的，底土的各种成分包括固体骨架、土壤、孔隙流体、孔隙水和孔隙气体。当底土受到外力作用时，一个对时间敏感的弹塑性或弹粘塑性变形过程被初始化，从而导致整个底土的耦合准静态或动态变形-流动问题。在这个子项目中，干燥，部分饱和和完全饱和的土壤被认为是一个强耦合的偏微分方程系统的基础上，从组件的质量和动量平衡的数值处理。整体模型是基于多孔介质理论，包括小的和有限的，弹塑性变形的底土。的数值研究进行了隐式和显式的时间积分程序适合于动态问题相结合的有限元法。

Both complicated foundations as well as foundation techniques necessary when building in an existing context (such as pile driving or vibrating) have to be based on a detailed survey of the mutual interactions of the emerging construction and the “overall system subsoil”. Considering these features, static as well as dynamic loadings conditions have to be taken into account. These loadings act on the subsoil and can cause large deformations. Withstanding these loads takes place by the mutual interaction of the various components of the subsoil consisting of a solid skeleton, the soil, and the pore fluids, pore water and pore gas. When the subsoil is loaded by external forces, a time-sensitive, elasto-plastic or elasto-viscoplastic deformation process is initialised resulting in a coupled quasi-static or dynamic deformation-flow problem of the overall subsoil. Within this sub-project, dry, partially saturated and fully saturated soils are considered and numerically treated on the basis of a strongly coupled system of partial-differential equations resulting from the mass and momentum balances of the components. The overall model is based on the Theory of Porous Media and includes small and finite, elasto-plastic deformations of the subsoil. The numerical investigations are carried out by the Finite-Element Method in combination with implicit and explicit time-integration procedures suitable for dynamic problems.