CFG桩复合地基承载变形特性的数值模拟研究

先对单桩复合地基与群桩复合地基的承载变形特性进行了比较,分析了沉降、桩身轴应力、土中附加应力和桩土应力比方面的差异,然后分析了桩间距、桩长、褥垫层厚度和桩端土性变化对群桩复合地基承载变形性状的影响.数值模拟结果表明:由于辟桩效应影响,单桩复合地基与群桩复合地基在承载变形特性方面差异较大；群桩复合地基中桩与桩间土是否形成...

StudyonNumerical Simulation of Load-bearing and Deformation Characteristics of CFG Pile Composite Foundation

The numerical simulation of load-bearing and deformation characteristics of CFG single pile composite foundation and CFG group pile composite foundation are compared,the differences are analyzed from settlement,axial stress of pile,additional stress in soil and pile-soil stress ratio.Then,the numerical simulation of load-bearing and deformation characteristics of CFG pile composite foundation is simulated by changing the parameters of pile spacing,pile length,cushion thickness,soil property of pile end etc.Simulation results show that： There is great difference in load-bearing and deformation characteristics between single pile composite foundation and group pile composite foundation.Whether or not pile and soil between piles of CFG pile composite foundation can form a whole entity,that is concerned with pile length and pile spacing,when pile length is short,it requires a relatively small pile spacing,when pile length is longer,bigger pile spacing can be chosen.The thicker the cushion is,the greater soil share of the load,while the pile smaller share of the load.The load-bearing of composite foundation greatlyimprove when pile end is in the thick hardpan.