刚性桩复合地基与复合桩基工作性状对比试验研究  

Experimental study on comparison of behavior between rigid pile composite foundation and composite pile foundation

作　　者：刘冬林[1] 郑刚[1] 刘金砺[2] 李金秀[3] 

机构地区：[1]天津大学建筑工程学院 [2]中国建筑科学研究院,北京100013 [3]河北城乡建设学校,河北石家庄050021

出　　处：《建筑结构学报》2006年第4期121-128,共8页Journal of Building Structures

基　　金：国家自然科学基金资助项目(50208012);河北省建设科学基金资助项目(2004-292)

摘　　要：针对高层建筑筏板荷载分布特点,采用内密外疏布桩方式,通过现场缩尺(1:10)模型试验,完成了带上部结构的复合地基与复合桩基载荷试验,分析了筏板沉降、桩端平面以下地基沉降和筏板外侧地面沉降、筏板下桩土反力分布、桩身轴力和侧摩阻分布及桩土荷载分担比,研究了工作荷载下复合地基与复合桩基的工作性状。与复合桩基相比,得出复合地基总沉降大、差异沉降小、桩端平面以下沉降小、桩上段存在负摩阻、桩间土荷载分担比大、桩荷载分担比小的试验结果;复合地基可以更好地调动浅层地基土承载力,而复合桩基则能更好地调动深层地基土承载力,所得结论可为进一步理论研究及工程设计提供有益参考。Based on load distribution of raft foundation of high-rise buildings, it is suggested to arrange piles with a pattern where more piles are located near the center. Through reduced scale （ 1 ： 10） model test, the composite foundation and composite pile foundation were studied with the presence of model super structure. The studies include the raft settlement, subgrade settlement under pile bottom plane, ground settlement beside raft, reaction force distribution of soil and pile top, axis force mad skin friction distribution of pile, and ratio of loads shared by pile and soil under raft. The behavior of composite foundation and composite pile foundation under working load condition were studied. Comparing with composite pile foundation, the experimental results showed that for composite foundation, the total settlement of subgrade is large, the different settlement of raft and the settlement of subgrade are small under pile bottom plane, the skin friction of pile is negative near pile top, and the soil shared more load than the pile. The composite foundation could make use of shallow layer subgrade bearing capability and composite pile foundation could make use of deep layer subgrade bearing capability. The conclusions of this paper may be useful for further theoretical studies and practical design.

关 键 词：高层建筑 沉降 反力分布 荷载分担比 

分 类 号：TU473.1[建筑科学—结构工程]