基于对数螺旋滑移面的土坡稳定性分析——极向条分极限分析法

Limit Analysis Method with Poloidal Slice of Slope Stablity Analysis Based on Logarithmic Spiral Gliding Plane

鉴于传统极限分析法中协调速度场建立的复杂性,构建了基于对数螺旋滑移面的土坡极向条分破坏模式,解决了协调速度场难以建立的问题。应用塑性力学极限分析原理,采用强度储备安全系数定义法,推导出了基于对数螺旋滑移面的均质土坡稳定性分析———极向条分极限分析法。通过算例验证,该法具有使用简便、可靠性强等优点,对于评价均质土坡的稳定性具有重要的指导意义。

In view of the complexity of the traditional coordination velocity field in the limit analysis method to establish, a poloidal slice failure modes of slope is built up on the base of logarithmic spiral gliding plane, which solves the difficult problem to establish the coordinated velocity field. Using the mechanics of plasticity limit analysis principle and strength reserve safety coefficient definition method, the paper derives the limit analysis formula with poloidal slice of isotropic soil slope stability analysis based on logarithmic spiral gliding plane. Through example confirmed, the method has the advantages of easy operation, strong reliability, for evaluation of homogeneous earth slope stability possessing important guiding significance.