有限元强度折减法在导流隧洞堵头稳定性分析中的应用

Application of strength reduction FEM to stability analysis of diversion tunnel plug

在总结国内外导流隧洞封堵设计一般原则的基础上,对堵头稳定性校核的两种常用数值计算方法进行了探讨分析,引入了材料强度折减法概念,根据弹塑性有限元数值分析结果,建议采用等效塑性应变作为潜在滑动面破坏的判断标准,并根据塑性区的范围和连通情况对堵头的稳定性进行综合评价。

On the basis of the summarization of the basic principles for design the tunnel plug at home and abroad, two normal numeric analysis methods for check of the plug stability are analyzed and discussed herein, and then the strength reduction FEM is introduced to suggest that the equivalent plastic strain can be taken as the criteria to estimate the failure of the potential sliding surface on the basis of the numerical analysis of elastoplastic finite dement, furthermore, a comprehensive evaluation is made on the plug stability in accordance with the area of plastic zone and the connectivity as well.