Analysis Of Fluid-structure Interaction For Site Deformation As Porous Medium

The fluid-solid interaction theory is a branch of mechanics that is formed by flowmechanics and solid mechanics. It is a disipline to study the interaction between fluid(water, gas, oil) and rock body in geological environment. It is concerned with theresearch and application to water seepage and control of hydropower projects, reservoir-induced earthquakes, coal injection hydraulic engineering, slope stability analysis, groundsubsidence caused by underground mining and other fields.This paper takes excavation site deformation impacted by groundwater as anexample, and various theories on pit deformation are analyzed. To the site deformation ofExcavation site, it could add the impact of the groundwater to the general equationsthrough certain constitutive. After defining properties of porous media in the materialmodel by means of finite element method, then it can be considered groundwater betterduring the excavation pit for pit effects. When three-dimensional simulations is made inthe use of ADINA, solid model and the fluid model are built and porous medium andisotropic linear elastic materials are set up respectively during establishing. Taking intoaccount the effect of fluid pressure permeability coefficient and elastic modulus on thedeformation of the site, the method of building fluid model is the same as structure model.The only difference is that adding fluid body flows into and out of the structure’s surfaceand the pressure is considered in the fluid model.Analysis of the numerical results of the simulation impact of groundwater on the sitedeformation process at the effect of fluid-structure interaction leads to the conclusion thatpermeability, fluid pressure and the elastic modulus of the foundation soil on the sitedeformation can not be ignored. As the pressure increases, the site of displacement, strain,effective stress and fluid flow also show increasing trend; as permeability coefficientincreases, the effective stress and flow velocity, displacement, strain values decrease; thegreater is soil modulus of elasticity, the smaller is vertical displacement, horizontaldisplacement and the strain when other conditions remain unchanged.