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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。
By using the theory of system reliability, the system reliability model of the bolt-in-wall anchor bolt system is established. According to the calculation method of active earth pressure recommended by the code, considering the various failure modes of the anchor rod, the structural function function of the bolt-rod anchor system is derived. Compile the program to analyze and calculate the example, get the reliable index under different failure modes of the bolt system. Finally, the influence of the variability of random variables on the reliability of the system and the change of the reliability index of the single anchor with the depth of the soil are discussed. It is found that the variation of the parameter φ has the greatest influence on the reliability index of the anchor system. Reliability decreases rapidly with depth.