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用三维有限差分方法建立了钉形搅拌桩复合地基的数值模型,分析了钉形搅拌桩复合地基设计参数对附加应力扩散的影响,并基于钉形搅拌桩复合地基的附加应力分布特性,提出了考虑应力集中效应的下卧层附加应力计算模型。结果表明:复合地基中桩体的存在减缓了附加应力的扩散,与天然地基相比,相同深度复合地基路中心加固区的附加应力较小,而下卧层的附加应力较大;钉形搅拌桩的扩大头高度、扩大头直径、桩长、桩间距、桩身模量是影响路堤荷载下钉形搅拌桩复合地基附加应力分布的主要因素;所提出的下卧层附加应力计算模型具有较好的适用性。
The three-dimensional finite difference method is used to establish the numerical model of the nail-shaped mixing pile composite foundation. The influence of the design parameters of the nail-shaped mixing pile composite foundation on the additional stress diffusion is analyzed. Based on the additional stress distribution characteristics of the nail-shaped mixing pile composite foundation, Substructure Stress Calculation Model Considering Stress Concentration Effect. The results show that the existence of pile body in composite foundation slows the spread of additional stress. Compared with natural foundation, the additional stress in the central reinforced zone of the same depth composite foundation is smaller and the additional stress of the sub-layer is larger. The enlarged head height, enlarged head diameter, pile length, pile spacing and pile body modulus are the main factors that affect the additional stress distribution of the spiked mixing pile composite foundation under the embankment load. The proposed additional stress calculation model of the sublayer layer Good suitability.