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传统的刚性桩复合地基支承路堤的稳定分析方法均是假定滑动区内桩体发生同时破坏。在已有研究基础上,采用有限差分方法开展了考虑桩体破坏后的不同性状(post-failure behavior)和不同桩体破坏顺序的路堤稳定性分析,结果表明无筋刚性桩复合地基首先在局部位置发生脆性弯曲破坏,应力释放后引发相邻桩体的弯矩大幅度增加并发生弯曲破坏,从而产生由局部桩体的弯曲破坏引发不同位置桩体的渐进破坏,并最终导致复合地基发生失稳破坏。假定桩体同时发生破坏的复合地基支承路堤的稳定分析方法将显著高估路堤稳定性,路堤下复合地基的稳定性分析应考虑局部位置首先破坏并引发其它位置桩体的渐进破坏。基于复合地基中桩体渐进破坏控制的理念,提出了路堤下复合地基关键桩的概念和分区不等强设计的稳定性控制方法,通过提高关键桩桩体抗弯强度及延性的方法,可有效提高路堤整体稳定性。
The traditional method for stability analysis of embankment supported by rigid pile composite foundation is to assume that the pile body in the sliding zone is destroyed at the same time. Based on the existing research, the embankment stability analysis considering the post-failure behavior and failure sequence of the pile subjected to pile failure is carried out by using finite difference method. The results show that the composite foundation with non-reinforced rigid pile first The brittle bending damage occurs at the location and the bending moment of the adjacent pile body caused by the stress release greatly increases and the bending damage occurs. As a result, the progressive failure of the pile body at different positions caused by the bending failure of the local pile body will eventually lead to the loss of composite foundation Stability damage. The stability analysis of embankment with composite foundations assuming simultaneous damage to the pile will significantly overestimate the stability of the embankment. The stability analysis of the composite foundation under the embankment should first consider the local location destroying and inducing gradual failure of the pile at other locations. Based on the concept of progressive failure control of piles in composite foundations, the concept of key piles of composite foundations under embankment and the stability control method of unequal zone design are proposed. It is effective to improve the bending strength and ductility of key piles. Improve the overall stability of the embankment.