基坑围护桩侵限成因分析与处理

Analysis on causes of the invasion limit of retaining pile in foundation pit

本文在分析基坑开挖过程中围护结构变形、坑边地表沉降及土压力变形规律的基础上,着重总结了基坑发生桩侵限的原因及其所带来的危害。在总结接桩法、补桩法等桩侵限处理方法的基础上,提出了力传递法和增设锚索法,并对增设锚索法作用机理进行了分析,总结了各种处理方法的优缺点及使用条件。最后用工程实例证明了力传递法和增设锚索法的有效性及合理性,为类似工程积累了经验。

The causes and the harm of the invasion limit of retaining pile in foundation pit are summarized based on analyzing the deformation of retaining structure in the pit excavation, the settlement of the surface and the variation rules of soil pressures. The force transmission method and the addition anchor method are presented through summarizing the lengthening pile method and the patching pile method which are used to treat the pile invasion limit, and the function mechanism on the addition anchor method is analyzed. The advantages and disadvantages of the different methods and the service conditions are summarized. The effectiveness and reasonableness of the force transmission method and the addition anchor method are proved by using engineering cases, which provides the experience for similar projects.