Study On Stability Of High Slope In Bai Yang Highway In Changping District In Beijing

With the increase of human activities and the expansion of the scope, a large number of water conservancy and hydropower projects at home and abroad have geological problems with anti-dumping slope which is formed by numerous rock layers. It brings about much trouble to engineering design, construction and operation. Using Aries ditch slope in Changping District in Beijing as a case, this study aims at analyzing the stability of high slope, bending rules and collapsed rock toppling trajectory prediction. There are several conclusions as following:(1) Based on the previous research, the topography, lithology, geological structure, hydrogeological conditions are analyzed in depth. There are four dangerous sections in Aries ditch slope;(2) With the foundation of survey report,the development characteristics of the slope in four sections are analyzed. Several basic failure modes of rock slope are found in this case. According to the landslides in No.2 section, it is concluded that dumping bent is the most common mode in Aries ditch slope. Furthermore, the influence factors are also analyzed.(3) Using stereographic projection method, the qualitative results are obtained; combining project comparison, field survey, laboratory experiments and norms, typical sections, the basic parameters and calculation conditions of the slope stability are clarified. Using UDEC distinct element method numerical simulation and Sarma, the safety factors and the stress and displacement maps for the three typically different sections in Aries ditch are developed. a comprehensive evaluation of Aries ditch slope stability are developed by comparing the results from abovementioned methods and those from basic mechanism of instability.(4) Using the discrete element program UDEC, the simplified model of the stability is checked. According to results from different combination of slope angle and thickness, the relationships among three main factors influencing dumping bent slope are summed up, which could provide a semi-empirical discriminant method to judge slope stability. (5) Based on contact mechanics and kinetic theory, this study predicts the speed and bounce height of falling rock, which could provides a theoretical basis for maximum security.