高速铁路粉喷桩复合地基临界桩长的测试研究

临界桩长是复合地基的一个重要参数，如何经济、合理地进行设计，是工程应用中极为关注的问题。而影响临界桩长的因素较多，针对如何考虑各个因素对临界桩长的影响程度问题，采用目前复合地基临界桩长研究中常用的计算公式，对影响复合地基临界桩长的相关因素进行了分析。结合高速铁路粉喷桩复合地基现场工程试验，对路堤荷载作用下粉喷桩复合地基临界桩长进行了探讨。研究表明 : 从承载力、沉降的概念出发推导的计算公式，计算得到的临界桩长偏小；采用荷载传递函数法导出临界桩长的计算公式较合理。桩体模量、土体模量、桩侧摩阻力位移值是影响粉喷桩复合地基临界桩长的主要因素，而土体的泊松比对临界桩长的影响较小。提出了粉喷桩复合地基并非都存在临界桩长的新观点。

Test Research on Critical Length of Dry Jet Mixing Pile of Composite Foundation in High-speed Railway

The critical length of a pile is an important parameter in a composite foundation.How to economically and reasonably design the composite foundation with piles is a notable problem.Several factors influence the critical length of the pile.How to consider the effect degree of factors on the critical length is a problem to be solved.The critical length of a dry jet mixing pile in a composite foundation of some high-speed railway was analysed through field tests.The factors affecting the critical length of the...