高速铁路粉喷桩复合地基临界桩长的测试研究  

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

作　　者：付凌云[1] 刘运飞[2] 

机构地区：[1]湖北水利水电职业技术学院建筑工程系,武汉430070 [2]长江科学院信息中心,武汉430010

出　　处：《长江科学院院报》2009年第12期76-79,83,共5页Journal of Changjiang River Scientific Research Institute

摘　　要：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。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 dry jet mixing pile in the composite foundation were studied by using conventional formulae. The research results indicated that： the critical length of the pile obtained by the formula derived on the concept of bearing capacity and settlement of soil is rather small, and that calculated resuits from formula deduced on load transmission method is reasonable ; the module of pile, the module of soil, and the displacement of side friction of pile have great influence on critical length of pile, but the Poisson＇ s ratio of soil has a little influence on critical length of pile. The new viewpoint of critical length of pile is put forward.

关 键 词：铁路工程 软土 粉喷桩 复合地基 临界桩长 沉降 

分 类 号：U213.1[交通运输工程—道路与铁道工程]