湿陷性黄土地区某高层建筑长短桩复合地基现场试验研究*
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翟晓力1,2,葛忻声1,张黎明1,白晓红1(1 太原理工大学建筑与土木工程学院,太原 030024; 2 山西水利职业技术学院,太原 030027)[摘要]以太原某采用长短桩复合地基的高层建筑在湿陷性黄土场地上开展的现场试验所得到数据为依据,分析了荷载作用下桩-土共同作用及地基变形情况。详细讨论了基底下长短桩及地基土应力、桩-土应力比、荷载分担比和长短桩桩身轴力随上部荷载变化的分布规律,以及长短桩复合地基的变形组成及其各组成部分之间的关系随上部荷载变化的规律,为长短桩复合地基的理论研究和优化设计提供参考。[关键词]湿陷性黄土地区;高层建筑;长短桩复合地基;承载性状;变形机理中图分类号:TU475+.3 文献标识码:A 文章编号:1002-848X(2013)10-0084-05In-situ test study on the long-short-pile composite foundation of a high-rise building in collapsible loess areaZhai Xiaoli1,2, Ge Xinsheng1, Zhang Liming1, Bai Xiaohong1(1 Architecture and Civil Engineering College, Taiyuan University of Technology, Taiyuan 030024, China; 2 Shanxi Conservancy Technical College, Taiyuan 030027, China)Abstract: Based on the data from in-situ tests of the long-short-pile composite foundation of a high-rise building in collapsible loess area in Taiyuan, the pile-soil interaction and foundation deformation were analyzed. Detailed discussion was given to the stress of the long-short pile and of the foundation soil, as well as pile-soil stress ratio, load-sharing ratio, and axial force of long and short piles as the upper load changes. In addition, the deformation components of the long-short-pile composite foundation and the variation of the relationship between the components when the upper load changes were also analyzed, which can be references for the theoretical study and optimal design of long-short-pile composite foundations.Keywords: collapsible loess area; high-rise building; long-short-pile composite foundation; bearing behaviour; deformation mechanism*国家自然科学基金项目(50678110)。作者简介:翟晓力,博士研究生,讲师,Email:zhaixiaoli2000@163.com。参考文献[1]葛忻声,龚晓南,张先明.长短桩复合地基有限元分析及设计计算方法探讨[J]. 建筑结构学报, 2003, 24(4):91-96.[2]朱奎.刚\|柔性桩复合地基特性研究[D].杭州:浙江大学,2006.[3]马骥,张东刚,张震,等.长短桩复合地基设计计算[J].岩土工程技术,2001(2):86-91.[4]葛忻声,龚晓南,张先明.长短桩复合地基设计计算方法的探讨[J]. 建筑结构,2002,32(7):3-7.[5]陈龙珠,梁发云,黄大治,等.高层建筑应用长短桩复合地基的现场试验研究[J]. 岩土工程学报,2004,26(2):167-171.[6]陈龙珠,梁发云,严平,等.带褥垫层刚柔性桩复合地基工程性状的试验研究[J].建筑结构学报,2004,25(3):125-129.[7]朱奎,徐日庆.带褥垫层刚柔性桩复合地基性状试验研究[J]. 建筑结构学报,2006,27(5):123-128.[8]林本海,方辉.长短桩高强复合地基的承载模型研究[J]. 岩石力学与工程学报,2009,28(S2):3857-3862.