土工结构安全系数定义及相应计算方法讨论

发布时间：2018-02-21 10:24

  本文关键词： 土工结构 安全系数定义 极限分析 极限平衡法 有限元极限分析　出处：《工程力学》2016年11期 　论文类型：期刊论文

【摘要】：以地基承载力、土坡稳定等常见土工结构问题为例,讨论土工结构安全系数的两种不同定义,一是极限荷载与容许荷载之比,一是已有强度参数与保持稳定所需强度参数之比。分析表明,前一定义仅对某些结构适用,而后一定义原则上可用于各种结构,具体选用要看结构及其所处环境的情况。当两种定义均适用时,允许安全系数的取值可有较大差别,具体设计时应予注意。此外,还对两种安全系数的计算方法进行了讨论,包括滑移线法、极限平衡法、极限分析法等传统方法以及近年来应用日趋广泛的弹塑性有限元法、有限元极限分析法等,对各类方法的优缺点及应用时需注意的问题给出自己的看法。
[Abstract]:In this paper, two different definitions of safety factor of geotechnical structures, such as bearing capacity of foundation and stability of soil slope, are discussed. One is the ratio of limit load to allowable load. The first is the ratio of existing strength parameters to those required to maintain stability. Analysis shows that the former definition applies only to certain structures, while the latter one can in principle be applied to various structures. The selection depends on the structure and its environment. When the two definitions are applicable, the values of the allowable safety factor may differ greatly, and attention should be paid to the specific design. In addition, the calculation methods of the two safety factors are also discussed. Including the slip line method, limit equilibrium method, limit analysis method and other traditional methods, as well as the elastoplastic finite element method, the finite element limit analysis method and so on, which have been widely used in recent years. The merits and demerits of various methods and the problems needing attention in application are given.
【作者单位】： 清华大学土木工程系;
【基金】：国家973计划课题项目(2014CB047003)
【分类号】：TU43
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本文编号：1521719