基于软化特性的三维边坡强度折减有限元分析

基于现有边坡强度折减有限元的基本原理，建立了一套新的强度折减算法。该算法把强度参数降低的过程看成脆塑性应力跌落的过程，并设置一折减增量 ，当 充分小时认为系统达到收敛条件而退出循环，最终的折减系数就是边坡的安全系数。该算法很容易扩展到三维边坡的稳定性分析，得到边坡滑动面滑动和破坏的发展趋势。通过2个算例，分析了进行三维模型计算的重要性，建议当地质条件复杂时宜从三维角度分析计算边坡，不能简单地将问题当作平面应变处理。

A strength reduction finite element method based on softening properties analysis for 3D slope

A new strength reduction finite element method is established based on the principle of strength reduction technology. We take the process of the strength parameters reduction as a brittle plastic stress drop course; and a strength reduction increment is set as convergence condition to determine whether the program out of circulation. The final reduction factor is the safety factor of slope stability. The theory can be easily extended to the three-dimensional slope stability analysis with high precision, and can find the sliding surface of the slope and its development tendency of failure. Through two case stidoes, the importance of the 3D slope model is shown; and it is suggested that when the geological condition is complex, we should carry out analysis from the three-dimensional angle rather than simply it to the two-dimensional problems.