峰值后软化水泥土桩复合地基工作机制研究  

Study on deformation and failure mechanism of composite foundation of cemented soil pile with post-peak softening behavior

作　　者：周敏锋[1] 张克绪[1] 张尔齐[1] 

机构地区：[1]哈尔滨工业大学,哈尔滨150090

出　　处：《土木工程学报》2007年第4期92-97,共6页China Civil Engineering Journal

摘　　要：基于收集到的三轴试验资料,建立了一个可考虑峰值后软化性能的水泥土力学模型。采用该模型对水泥土单桩复合地基体系进行了数值模拟分析,研究了水泥土复合地基的荷载-沉降曲线、水泥土桩的轴向力、侧摩阻力和桩土应力比,以及母土、水泥掺合比、桩径和桩长等因素的影响。基于模拟分析的结果,得到水泥土桩端破坏是水泥土桩复合地基承载力的控制条件。研究了水泥土桩端破坏时的桩端变形和桩身压缩。基于水泥土复合地基破坏机制,对确定水泥土桩复合地基承载力提出了建议。A cemented soil model featured by post-peak softening is established on the basis of collected tri-axial experiment data. Numerical analysis of single pile composite foundation system is performed to reveal the influence of factors as load vs. settlement curve, axial forces, side friction, natural soil, cement admixture ratio and pile length Simulated analysis results show that failure of pile top is the dominant condition of bearing capacity of cemented etc. soil composite foundation. Pile top deformation and shaft compression at failure state of pile top are studied as well. Determination of bearing capacity of cemented soil composite foundation based on work mechanism is suggested.

关 键 词：库值后软化 水泥土桩 复合地基 工作机制 

分 类 号：TU472.3[建筑科学—结构工程]