基于概率论的支挡结构极限状态设计方法

Method of Retaining Structure Limit State Design Based on Probability Theory

研究目的:基于概率论的可靠度理论,是工程研究与工程设计的一种先进方法,但限于相关研究不足,我国现行铁路路基支挡设计规范尚未采用,开展基于概率论的支挡结构极限状态设计方法的研究十分必要。研究结论:(1)采用总安全系数法的传统支挡结构设计的可靠度未知,未考虑变量的不确定性带来的影响,潜在一定安全风险;(2)支挡结构极限状态设计方法研究的思路是建立极限状态方程→分析可靠指标→确定设计表达式中的分项系数;(3)应根据不同的工况确定目标可靠指标和极限状态设计表达式中的分项系数;(4)本文提出的基于概率论的支挡结构极限状态设计方法,可直接用于铁路路基支挡结构设计。

Research purposes：The reliability theory based on the probability theory is a kind of advanced method for engineering research and design,but limited to the lack of related research,has not been adopted in the current design specifications of railway subgrade retaining in China.So it is necessary to research the retaining structure limit state design method based on probability theory.Research conclusions：（1） The reliability of the traditional retaining structure design by using the total safety coefficient method is unknown,the effects of the variable uncertainty is not consideed,some potential safety risks exist.（2） The research approach to study the limit state design method of retaining structue is to establish a limit state equation,analyze reliability index and determine the partial coefficient of design expression.（3） Determine the target reliability index and the partial coefficient in limit state design expression according to the different condition.（4） In this paper,the retaining structre limit state design method based on the probability theory can be directly used in the design of railway subgrade retaining structure.