Abstract:Searching for critical slip surface is the key work of analysis of slope stability,and is important for design,construction and stability evaluation. With the development of computer technology,all kinds of optimization technologies are applied to search critical slip surface. Leapfrog algorithm is an excellent global optimization method. The optimization problem is consideration of the analogous physical problem of the motion of a particle in a conservative force field,where the potential energy of the particle is represented by the goal function. Some interfering strategies are adopted to monitor the trajectory of the particle,and then to solve the problem. Slope stability is usually analyzed using limit equilibrium methods. A new methods combined Leapfrog algorithm and Spencer method is proposed to search for the arbitrary shape slip surface. The performance of the proposed method is tested and verified through the classical examples.