旁侧荷载对复合地基性状的影响  

The influence of surcharge on working behaviors of composite foundation

作　　者：胡双全 朱常志[2] 郑兴莲[3] 

机构地区：[1]保定市建设工程招标投标管理办公室,河北保定071000 [2]河北农业大学城乡建设学院,河北保定071001 [3]保定市职业技术学院,河北保定071051

出　　处：《河北农业大学学报》2010年第1期104-107,共4页Journal of Hebei Agricultural University

摘　　要：以CFG桩复合地基为例,采用FLAC-3D建立了复合地基三维数值分析模型,通过有无旁侧荷载条件下复合地基的变形特性、承载能力、桩土应力比和桩土荷载分担比的比较,揭示了旁侧荷载对复合地基工作性状的影响规律。研究表明,当天然地基强度较高且基础埋深较大时,按现行《建筑地基处理技术规范》JGJ79-2002确定复合地基承载力特征值,可能会严重低估复合地基的承载能力,造成不必要的浪费。Three-dimensional numerical model of the CFG pile composite ground was established by FLAC-3D, and through comparing the deformation characteristic, bearing capacity, the pile-soil stress ratio and pile-soil load share proportion of composite ground under any side of surcharge conditions, and it revealed the influence law of surcharge on performance of composite foundations. The result showed that when the intensity of natural foundation is higher and the depth of foundation is larger, if we determined the characteristic value of subgrade bearing capacity according to ＂Technical code for ground treatment of buildings （JGJ79 - 2002）＂, the bearing capacity of composite foundation will he seriously underestimated and result in unnecessary waste.

关 键 词：复合地基 旁侧荷载 工作性状 数值分析 

分 类 号：TU473[建筑科学—结构工程]