Based On Abaqus Fluid-structure Interaction Theory Bank Landslide Stability Analysis

There are some geological disastrous such as landslide in our country. Specially with the great scale of constructions for water resources, more and more landslides becomes unstable, which brings serious endanger to society and people. The reason is that when water permeates into landslides, it always weaken the stability of landslides. In fact, if there is any water, stress field and seepage field will affect each other, will be in a coupling dynamic drift situation and form a coupling relation.On the basis of material analysis to coupling effect, the author reachs the action mechanism between the stress field and the seepage field: first, the change of stress field can make influence to permeation parameter, then to the seepage field. Another, the seepage field can also make influence to stress field throw changing the water load. Based on balancing equation of framework of rock and soil and the principle of virtual work, the stress balancing equation can be acquired. Based on the continuity equation of ground water and the variation principle, the seepage differential equation can be acquired.The above two equations form the control equations which usually is a nonlinear equations. The dissertation computed the coupling problem of seepage and stress, and qualitive evaluate the stability of landslide.The upper part of landslide has high nonlinear character, we can use Duncan-Chang constitutive to simulate it. Choosing ABAQUS software as the high level development platform, the redevelopment procedures to add Duncan-Chang constitutive model were described and were compiled to codes. Some numerical verification were then examined strictly. According to the data of typical conventional triaxial compression tests, the verifications show that the redevelopment is successful.Maoping Landslide, one of the most typical and important large-scale recur landslide in the head-pond of Geheygan reservoir in Qingjiang River, has multilevel and repetitious sliding characters. Once the Maoping slope becomes instable, disastrous destroy can be caused. This dissertation analyses the geological characteristics and monitoring data of Maoping Landslide comprehensively, and make qualitive evaluation on the influence of water to landslide stability. In addition, according to the numerical calculation on landslides, the author make quantitative evaluation under twosituations: the natural reservoir water level and rapidly ascend reservoir water level. The simulating result indicates: for the first situation, the plastic zone is limited and can't endanger the stability of the slope. But there is a tension area, and the ground water surface is a convex surface towards the slope face and the gradient is high near the slope back edge. And when water level ascends higher, the plastic zone also present at shallow zone near the slope front and back edges. And the stability becomes worse, even at the front edge.All the schemes proposed in this thesis have strong utility to stability analysis and seepage-stress coupling analysis, and are cable of reference to numerical simulation research for geo-engineering, hydropower structures and other engineering fields.