(1 长安大学建筑工程学院, 西安 710064; 2 长安大学公路学院, 西安 710064)

［摘要］介绍了处于黄河中下游冲积平原的郑州黄河公铁两用桥深长桩基承载力测试的传统静载荷试桩法。分析了大量的实测数据及相应的Q-s曲线，并将实测结果与规范方法所得结果进行了比较。结果表明：实测桩的承载力小于相应规范值，前者约为后者的74%；实测桩侧摩阻力与相应规范值基本相当，而实测桩端阻力远小于相应规范值，前者约为后者的20%; 桩侧阻力先于桩端阻力的发挥，桩的沉降量主要是桩身压缩量。

［关键词］冲积平原;深长桩;静载试验;承载力

中图分类号：TU473-1文献标识码：A文章编号：1002-848X(2011)05-0098-03

Test study on the bearing capacity of long piles on the alluvial plain in the middle and lower reaches of the Huanghe River

Lei Zixue¹, Qu Shangwen¹, Bai Qingxia², Yang Yuhou²(1 School of Civil Engineering, Changan Univerisity, Xi’an 710064, China；2 School of Highway Engineering, Chang’an University, Xi’an 710064, China)

Abstract:Conventional static loading method for long piles adopted in Zhengzhou Road-rail Bridge on the alluvial plain in the middle and lower reaches of the Huanghe River was introduced. Lots of data measured and the corresponding Q-s curves were analyzed, compared  the test results  with those obtained by the method in the code. The test results show that the bearing capacity obtained in the test is less than that calculated according to the code, and the former is about 74% of the latter. The side friction measured is approximately the same as that calculated with the formula in the code, whereas the pile tip resistance is much smaller than that in the code, and the former is about 20% of the latter. The side friction is mobilized earlier than the tip resistance and the pile settlement is mainly the compression of pile shaft compression.

Keywords:alluvial plain; long pile; static loading test; bearing capacity

作者简介：雷自学,副教授，Email: thunderleizixue@126.com。

参考文献

［1］吴启红，彭振斌，彭文祥，等.某工程大直径灌注桩试验研究及其沉降分析［J］.矿冶工程： 2008，28(5)：9-12.

［2］水伟厚，梁永辉，詹金林.软土地区大型桩筏基础原位试验研究［J］.工业建筑，2009,39(4)：88-92.

［3］王盛，胡志清.大直径超长钻孔灌注桩试验研究分析［J］.世界桥梁，2005(2)：61-62.

［4］李增选.高应变动力试桩若干问题研究［D］.上海：同济大学，1997.

［5］李增选，张莹.静动试桩法及其应用［J］.同济大学学报，2000，28（1）：108-112.

［6］简政,李毅,司建辉，等.桩基有限元法、静力法和经验法对比研究［J］.西安理工大学学报,2005，21（1）：82-85.

［7］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.

［8］JTGD63—2007公路桥涵地基与基础设计规范［S］.北京：人民交通出版社,2007.

［9］胡庆红，张士乔，谢新宇.深厚软土中大直径灌注扩底桩受力性状试验研究［J］.土木工程学报，2007，40(4)：87-91.

［10］辛公锋，张忠苗，夏唐代，等.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.