系统可靠性理论在肋柱锚杆体系中的应用

System Reliability Theory Applied to Ribbed Anchor System

运用系统可靠性理论,建立了锚杆挡墙中肋柱锚杆体系的系统可靠性模型。根据规范推荐的主动土压力的计算方法,考虑锚杆的多种失效方式,导出了肋柱锚杆体系的结构功能函数。编制程序对算例进行分析计算,得到了锚杆系统不同破坏模式下的可靠指标。最后讨论了随机变量的变异性对系统可靠度的影响以及单根锚杆可靠指标随岩土体深度的变化,发现参数φ的变异性对锚杆体系可靠指标的影响最大,单根锚杆的可靠度随深度迅速降低。

Based on the system reliability theory,a model of ribbed anchor system in anchor retaining wall was built.According to the calculation method of active soil pressure recommended by the relative specification,considering the influence of anchor＇s several failure modes,the structural performance function of the ribbed anchor system was derived.By the program composition for a given calculation example,the reliability index under various anchor failure modes was obtained.In the end,the influence of random variable＇s variability on the system reliability and the depth of rock and soil mass on single anchor＇s reliability index were discussed.It is found that the parameter φ has the most influence on the reliability index of the anchor system and the single anchor＇s reliability index reduces sharply with the decrease of the depth.