基于Rosenblueth法的土钉墙可靠度分析

Study on the Stability Reliability Analysis of Soil Nailed Structure

土钉墙的稳定性受设计参数的随机性、变异性影响很大。在分析土钉支护的常见失稳模式的基础上,建立了土钉支护发生整体滑移破坏、倾覆破坏、土钉拔出破坏等模式下的极限状态方程,采用Rosenblueth矩估计法,对土钉墙进行了可靠性分析。研究表明:土钉支护结构设计时宜考虑参数的随机性进行可靠性分析;土钉等长设计时中部土钉的可靠性较小;实际工程中宜采用上部和下部土钉较短、中部土钉较长的配置方法。

The structure stability of soil nailing is affected significantly by the randomness and variability of design parameters. Based on the reliability theory and Rosenblueth method which is for calculating reliability ,after the analysis of the common failure modes ,the limit state equations in different failure models such as overall sliding ,overturn ,soil nail pullout have been established ,and an example has been analyzed. Research shows that :the randomness and vari-ability of soil nailing design parameters should be considered and analyzed the structure reliability in its design ;when the soil nails have same length in design ,the reliability of central soil nails is smaller than that in up and down ;in the prac-tical engineering The allocation method that the length of central soil nails should be longer than that in up and down are advised.