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近年来,长短组合桩复合地基在地基处理技术中的应用越来越广泛。通过FLAC3D建立CFG桩-石灰桩复合地基数值分析模型,分析了不同的桩长、桩径以及褥垫层厚度等工况下多元复合地基沉降以及桩土应力比的变化规律。分析结果表明,相对于石灰桩而言,CFG桩的桩长以及桩径对复合地基的沉降以及桩土应力比的影响要更为明显;褥垫层能够显著地降低桩土应力比,减弱CFG桩桩顶的应力集中现象,并且存在着一个最佳的厚度。
In recent years, the combined length of the pile composite foundation in the application of foundation technology is more and more widely used. The numerical analysis model of CFG pile-lime-pile composite foundation is established by FLAC3D. The variation of pile-soil stress ratio and settlement of composite foundation under different pile lengths, pile diameters and cushion thickness are analyzed. The results show that the pile length and pile diameter of CFG pile affect the settlement of composite foundation and the ratio of pile-soil stress more obviously than that of lime pile. Cushion can significantly reduce the stress ratio of pile-soil and weaken CFG Stress concentration at the top of the pile, and there is an optimal thickness.