Research On Three-Dimension Stability Analysis Methods For Landslide

Landslide stability analysis is a traditional subject in landslide engineering. At the present time, many computing methods have been proposed to evaluate the stability of landslide. Because of the clear physical background, the limit equilibrium methods are the most popular and the most feasible for practical engineering application. However, two-dimensional landslide stability analysis can not satisfy requirements of some practical engineering. And therefore more and more three-dimensional landslide stability methods have been proposed for practical engineering.The most important tasks of landslide stability analysis include three parts. The first task is calculating the safety factor of the landslide with arbitrary slip surface. The second task is searching the most dangerous slip direction of the landslide with the arbitrary slip surface. The third task is the search for the most dangerous potential slip surface, and its most dangerous landslide direction.Aiming at the above-mentioned tasks, several three-dimensional limit equilibrium methods for landslide stability analysis have been proposed in the thesis. A new approach for three-dimensional landslide stability analysis is presented which is an extension of the assumptions associated with the residual thrust method. And a relevant program named SA-3D, which may perform three-dimensional residual thrust method, is compiled to calculate the safety factor of landslide. An automatic search method for the most dangerous sliding direction of landslide is implemented by using of genetic algorithm. Finally, this algorithm and other methods are simultaneously utilized to analyze the stability of Sanbanxi landslide. Through the comparisons of the calculated safety factors and the landslide direction, some instructive conclusions are presented.