桥梁和房屋建筑受力特点不同,因此铁路、公路以及工民建行业在桩基承载力计算上有着不同的认识和理解,特别是在桩端阻力的处理上很不一样.三岔双向挤扩灌注桩是近年来兴起的一种多点支承的新型变截面桩,其盘阻力占到了总承载力较大的比例,往往超过30％.在设计该桩型时,采用不同行业规范将出现较大的差异.通过研究不同规范中的计算方法,并依据已有详细准确资料的18个工程,对DX桩在铁路工程中的设计方法进行了研究.%Different industry has different calculation method for bearing capacity of pile. Industry of railway , high way and building treat the tip bearing capacity of pile in different ways. DX pile is a new kind of varied cross-section pile. Applying calculation methods in the specification of these three industries on DX pile will induce significant different results. Based on 18 case of DX pile, the difference of calculation methods were discussed and a new design method for DX pile of bridge was proposed.
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