基于强度折减法与有限单元应力法的边坡稳定性分析  

Stability Analysis of Slope Based on Strength Reduction Method and Finite Element Stress Method

作　　者：乐慧琳 魏继红[1] 施威[1] 宋京雷 

机构地区：[1]河海大学地球科学与工程学院,南京市210098 [2]江苏省地质调查研究院,南京市210098

出　　处：《勘察科学技术》2016年第2期1-4,55,共5页Site Investigation Science and Technology

基　　金：国家自然科学基金资助项目(41102162)

摘　　要：该文以某水电站开挖边坡为例,利用强度折减法进行稳定性分析和求解安全系数,探讨强度折减法中抗拉强度和剪胀角对边坡稳定性的影响,并利用有限单元应力法校核强度折减法计算结果,对两种计算方法的计算过程和结果进行对比分析。通过对比分析发现强度折减法的计算结果比有限单元应力法计算结果略小,计算得到的安全系数都小于1,说明边坡不稳定。分析发现,剪胀角的取值对强度折减法的计算结果有一定的影响,抗拉强度的取值对强度折减法的计算结果影响很小。强度折减法计算所需参数更多,计算条件更加完整。有限单元应力法可以计算出单元的最大位移并且显示单元的变形。研究结果可为类似工程提供参考。In the paper,taking the slope excavation of a hydropower station as an example,the strength reduction method is used to analyze the stability of the slope,solve safety factor and discusse the impact of tensile strength and dilation angle on slope stability. The finite element stress method is used to check the result calculated by strength reduction method. The calculation process and results of the two calculation methods are analyzed and compared. The result shows that the slope safety factor calculated by strength reduction method is a little smaller than that calculated by finite element stress method. The slope safety factors calculated by these two methods are all smaller than 1,and it means the slope is unstable. Through analysing,it finds that the value by dilation angle has an impact on the results of strength reduction,the value of tensile strength has little impact to dilation angle. Strength reduction method requires more parameters and more complete calculation conditions. The finite element stress method can calculate the maximum displacement of unit and display the deformation of unit. The result can give some guidance for the similar engineering.

关 键 词：强度折减法 有限单元应力法 稳定性分析 剪胀角 抗拉强度 

分 类 号：TV223[水利工程—水工结构工程]