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刚柔组合二元复合地基将竖向增强体复合地基中的柔性桩、刚性桩综合用于加固软弱地基,具有良好的技术优势和经济效益。在考虑上部结构与筏基及二元复合地基三者共同作用的前提下,针对二元复合地基各种不同布桩方式对三者共同作用所产生的影响进行了分析。分析中,上部结构为一个十层的框架结构,筏基为平板式筏基,二元复合地基采用石灰柔性桩和CFG刚性桩两种桩型。在桩总数不变,两种桩数各占一半的前提下,布桩方式采用“内强外弱”、“外强内弱”、“中部强内外弱”、“中部弱内外强”四种。综合四种情况下的竖向增强体桩顶反力、筏基沉降、筏基内力分布、上部结构内力对比表明,各种布桩方式各有利弊,相对而言,“中部弱内外强”的组合方式既可以使筏基沉降减至较低,又能适当减小上部结构及筏基的弯矩值,是一种相对优化的布桩方式。
Rigid-flexible composite binary composite foundation will be used to reinforce the soft foundation by using flexible piles and rigid piles in vertical reinforcement composite foundation, which has good technical advantages and economic benefits. On the premise of the interaction between the superstructure and the raft foundation and the binary composite foundation, the influences of the three different combinations of the three piles on the dual composite foundation are analyzed. In the analysis, the superstructure is a ten-story frame structure, the raft foundation is a flat raft foundation, and the binary composite foundation is made of lime pile and CFG rigid pile. Under the premise of the total number of piles unchanged and the two kinds of piles each accounting for half each, the method of piling is adopted as follows: “strong inside and weak outside ”, “strong inside and weak ”, “ Central weak inside and outside the strong ”four. The results show that there are pros and cons for all kinds of piling methods in comparison with the vertical reinforcement body top reaction, raft foundation settlement, raft foundation internal force distribution and superstructure internal force in four cases. In contrast, "Combination of both raft settlement can be reduced to a lower, but also appropriate to reduce the superstructure and raft base bending moment value is a relatively optimal way of piling.