砂土中超长桩承载性能试验
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砂土中超长桩承载性能试验金明1,龚维明2,葛建光3(1 南京地下铁道有限责任公司, 南京 210008; 2 东南大学土木工程学院, 南京 210096;3 江苏省苏科建设技术发展有限公司, 南京 210008)[摘要]在中砂中对长细比分别为40,50,60的3根超长单桩进行室内模型试验,对单桩荷载-沉降(Q-s)关系、轴力以及桩侧摩阻力的荷载传递机理等进行研究,揭示了超长桩的承载特性。同时以单桩荷载传递双曲线模型为基础,对实测曲线进行了回归分析,得出了模型中的关键参数值,并通过实测单桩Q-s曲线与模拟计算Q-s曲线的对比,验证了双曲线模型的合理性。[关键词] 超长桩;模型试验;承载性能;双曲线模型中图分类号:TU473.1文献标识码:A文章编号:1002-848X(2011)01-0114-04Experimental study on load-carrying properties of super-long piles in sandJin Ming1, Gong Weiming2, Ge Jianguang3(1 Nanjing Metro Co., Ltd., Nanjing 210008, China; 2 Department of Civil Engineering, Southeast University,Nanjing 210096, China; 3 Jiangsu Suke Construction Technology Co., Ltd., Nanjing 210008, China)Abstract:Three super-long single piles with the length-diameter ratio 40, 50 and 60 respectively were tested in sand. The characteristics of load-settlement, axial load, and frictional resistance of piles were analyzed. The load-carrying properties of super-long piles were obtained. Based on the hyperbola model of the load-carrying, the measured curve was regressed,and the key parameters were obtained. The hyperbola model has been validated to be reasonable by comparing the measured and calculated Q-s curves.Keywords:super-long pile; model test; load-carrying properties; hyperbola model作者简介:金明,高级工程师,Email:gejianguang0313@163.com。参考文献[1]蒋建平.大直径灌注桩竖向承载性状[M].上海:上海交通大学出版社,2007.[2]张克恭,刘松玉.土力学[M].北京:中国建筑工业出版社,2001.[3]JGJ106—2003 建筑基桩检测技术规范[S]. 北京:中国建筑工业出版社,2003.[4]桩基工程手册编写委员会. 桩基工程手册[M]. 北京:中国建筑工业出版社,1997.[5]NABIL F ISMAEL. Axial load tests on bored piles and pile groups in cemented sands[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(9):766-773.[6]MCCABE B A, LEHANE B M. Behavior of axially loaded pile groups driven in clayed silt [J].Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(3):401-410.[7]辛公锋,张忠苗. 高荷载水平下超长桩承载性状试验研究[J].岩石力学与工程学报,2005,24(13):2397-2402.[8]蒋建平,高广运.大直径超长桩有效桩长的数值模拟[J]. 建筑科学,2003,19(3):27-29.[9]章为民,王年香. 苏通长江公路大桥主桥索塔群桩基础与土体共同作用离心模型试验研究报告[R]. 南京:南京水利科学研究院,2007.[10]SEED H B, REESE L C. The action of soft clay along friction piles[J]. Trans., ASCE, 1957(122):731-754.