基于可靠度分析设计边坡土钉支护工程

Design for Slope Reinforced by Soil Nailing based on Reliability Analysis

为了合理设计边坡土钉支护工程,采用圆弧滑裂面分析方法,依据滑动面上抗滑力与下滑力相等即滑动面处于临界极限破坏状态,确定边坡土钉支护工程稳定性极限状态功能函数,基于强度折减有限元法进行可靠度分析。通过工程算例把计算参数视为随机变量,以可靠度分析考虑计算参数对边坡土钉支护工程稳定性的影响,通过可靠度指标对计算参数的敏感性分析确定影响边坡土钉支护工程稳定性主要参数的设计取值。工程算例表明,采用可靠度分析设计边坡土钉支护工程是合理的,具有一定的工程应用价值。

In order to reasonably design for slope reinforced by soil nailing,the sliding surface analysis method is used.According to the theory that if the anti-sliding surface equals to the sliding force on the sliding surface when the sliding surface is in the critical limit of damage,the author determines stability limit state function of soil nailing support project of slope.Reliability analysis is based on strength reduction finite element method.The calculation parameters are taken as random variables in engineering examples,and the influence of the calculation parameters on the stability of the slope reinforced by soil nailing is considered by reliability analysis.The sensitivity of the calculation parameters is determined by the reliability index to determine the design value of the main parameters that affect the stability of the slope reinforced by soil nailing.The result shows that it is reasonable to design soil nailing support with reliability analysis,and it has certain engineering application value.