锚索抗滑桩结构系统可靠性分析研究

Study on Reliability Analysis of Anchor Cable Anti-Slide Pile Structural System

预应力锚索抗滑桩在治理滑坡工程中已广泛使用,但其设计与计算理论远远滞后于工程应用.在工程设计中没有充分考虑到岩土体岩土体材料具有的不确定性以及岩土体与结构系统相互作用的复杂性。为此,将可靠度理论应用于锚索抗滑桩的设计计算中,根据工程中锚索抗滑桩的失效形式建立其可靠度计算模型.提出了将蒙特卡洛法与PNET法相结合进行锚索抗滑桩的结构系统可靠度计算,该方法充分利用了蒙特卡洛法计算精度高,又考虑了各失效模式间的相关性,较单一方法具有明显的优点,工程实例验证了该方法的可行性与合理性,具有十分重要的工程实际意义。

Pre-stressed anchor cable anti-slide piles have been widely applied in regulating landslide engineering. However, its design and calculation theory far lag behind its engineering application. The uncertainty of rockmass material and the complexity of interaction between rockmass and structural system are not fully considered in engineering design. For this, reliability theory is used in the design calculation of anchor cable anti-slide pile and its reliability calculation model is built according to its failure form. A reliability calculation method for the structural system of anchor cable anti-slide pile by using both Monte Carlo method and PNET method is proposed, which not only makes full use of the high calculation accura- cy of Monte Carlo method, but also takes into consideration of the correlation among various failure modes. Therefore, it is obviously more advantageous than single method. Practical engineering case has proven its feasibility and rationality, and therefore, it is of very important engineering significance.