三维土质边坡降雨入渗及稳定性分析

发布时间：2018-05-12 01:23

本文选题：岩土工程 + 边坡　；参考：《沈阳建筑大学》2015年硕士论文

【摘要】：地质灾害种类繁多,城市边坡主要灾害为整体滑坡破坏,影响边坡稳定的因素也多种多样,降雨是诱导滑坡的主要因素。当进行边坡降雨入渗及稳定性分析时,为了方便计算通常将自然界三维状态的边坡简化为二维处理,忽略三维效应对降雨边坡的影响,这显然这并不能比较全面地反映降雨入渗过程及降雨对边坡稳定性的影响。对于三维边坡,一方面边坡形状会影响地表径流的深度和流态,进而影响降雨入渗过程和土坡稳定；另一方面,虽然一般认为工程上采用的二维分析方法得出的计算结果是偏于安全的,但在有些情况下,边坡体的三维边界效应是不能忽略的,否则会造成工程建设的浪费或对滑坡机制的误判。本文通过对大型有限元软件ABAQUS的二次开发,建立了合理的三维边坡降雨入渗模型,在考虑地表径流与地下流共同作用的基础上进行了流固耦合计算。着重从土体的性质、边坡的边界条件、降雨的强度、三维边坡的几何形状四个角度出发,深入而系统地探讨了降雨条件下边坡的降雨入渗情况及其稳定性。通过对比三维模型与相同条件下的二维模型计算结果,分析了三维效应对降雨入渗及边坡稳定性的影响。
[Abstract]:There are many kinds of geological disasters, the main disasters of urban slope are the whole landslide damage, and the factors affecting slope stability are also various. Rainfall is the main factor to induce landslide. When slope rainfall infiltration and stability analysis are carried out, in order to facilitate calculation, the slope with 3D state in nature is usually simplified to two dimensional treatment, and the effect of 3D effect on rainfall slope is ignored. This obviously does not reflect the rainfall infiltration process and the influence of rainfall on slope stability. For three-dimensional slope, on the one hand, the shape of slope will affect the depth and flow state of surface runoff, and then affect the process of rainfall infiltration and the stability of soil slope; on the other hand, Although it is generally considered that the results obtained by the two-dimensional analysis method used in engineering are relatively safe, in some cases, the three-dimensional boundary effect of the slope can not be ignored. Otherwise, it will cause waste of engineering construction or misjudgment of landslide mechanism. Through the secondary development of the large-scale finite element software ABAQUS, a reasonable three-dimensional slope rainfall infiltration model is established, and the fluid-solid coupling calculation is carried out on the basis of considering the interaction between surface runoff and subsurface flow. From the aspects of soil property, slope boundary condition, rainfall intensity and geometric shape of 3D slope, the rainfall infiltration situation and stability of slope under rainfall condition are discussed deeply and systematically. The effect of 3D effect on rainfall infiltration and slope stability is analyzed by comparing the results of 3D model and 2D model under the same conditions.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

【参考文献】