基于数值模拟方法的黄土边坡稳定性研究

发布时间：2018-03-24 09:50

本文选题：黄土边坡　切入点：数值模拟　出处：《长安大学》2015年硕士论文

【摘要】：黄土在我国分布面积广,厚度大。黄土滑坡是我国分布很广泛,破坏很严重的一种自然灾害,对人民生命和财产安全造成了极大危害,因此研究黄土边坡,在防灾减灾领域有着重要意义,数值模拟方法是研究黄土滑坡的较为有效的方法。本文在总结分析黄土边坡类型、成因、破坏方式的基础上,研究了黄土边坡在地震作用下和水渗流作用下边坡稳定性的变化。获取的主要认识如下:(1)总结了黄土边坡的成因、类型、破坏形式等(2)概括了边坡计算的基本模型如极限平衡法-简化毕晓普法,强度折减法和非饱和渗流的物理模型等;(3)用ABQUS软件分析了在地震作用下不同结构黄土边坡的加速度、形变、应力等,总结出软弱夹层倾角不同黄土边坡对地震荷载的不同响应,得出规律性结论。结果表明随着软弱夹层倾角反倾到正倾,逐渐增加的过程中,边坡对地震的响应也随着增强;(4)用GeoStudio软件分析在集中入渗,降雨入渗,库水位突然下降等与水有关工况,黄土边坡稳定性的变化,总结出规律性结论。表明入渗点的位置不同,对边坡稳定性影响巨大。在考虑总降雨量一样的情况下,降水时间越大边坡稳定性越差。库水位突然下降的情况下,由于内部孔隙水压力还没有来的及消散,而外界水压力消失,造成稳定性下降。
[Abstract]:Loess landslide is a kind of natural disaster which is widely distributed and seriously damaged in our country, which has caused great harm to people's life and property safety, so the loess slope is studied. In the field of disaster prevention and mitigation, numerical simulation method is an effective method to study loess landslide. The variation of slope stability under earthquake and water seepage is studied. The main knowledge obtained is as follows: 1) the causes and types of loess slope are summarized. The basic models of slope calculation, such as the limit equilibrium method, the simplified Bixiaopu method, the strength reduction method and the physical model of unsaturated seepage, are summarized. The acceleration of loess slope with different structures under earthquake action is analyzed by ABQUS software. Deformation, stress and so on, the different responses of loess slope with different dip angles of weak intercalation to earthquake load are summarized, and the regular conclusions are drawn. The results show that with the dip of weak intercalation tilting backwards to the positive inclination, the slope gradually increases. The response of slope to earthquake is also enhanced with the increase of earthquake. The GeoStudio software is used to analyze the variation of stability of loess slope under the conditions of concentrated infiltration, rainfall infiltration and sudden drop of reservoir water level. The results show that the location of infiltration point is different. The larger the precipitation time, the worse the slope stability. When the reservoir water level drops suddenly, because the internal pore water pressure has not come and dissipates, But the external water pressure disappears, causes the stability to drop.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43

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