带肋填砂管桩承载力研究
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戴庆斌（温州职业技术学院， 温州 325035）［摘要］对普通预应力混凝土管桩桩身加肋、沉桩过程中在桩侧填砂可有效提高桩基的承载能力。通过构建基于桩-土荷载传递模型来分析带肋填砂管桩的土层侧阻力与位移间的对应关系，确定桩-土荷载传递函数，进一步分析研究了带肋填砂管桩承载力的提高幅度。分析及实测结果均表明，相比普通管桩的侧阻力，带肋填砂管桩的土层侧阻力有较大幅度的提高。然后又通过荷载传递模型反推出各土层侧阻力屈服值及其对应的位移，为以后带肋填砂管桩的设计取值提供参考。同时还研究了带肋填砂管桩的侧阻、端阻所占的桩顶荷载的比例，及该比例与桩顶荷载之间的关系，结果表明此比例与桩顶荷载之间基本呈线性关系。［关键词］带肋填砂管桩； 承载力； 侧阻力； 端阻力中图分类号：TU473.1+1 文献标识码：A 文章编号：1002-848X(2013)05-0092-05Study on bearing capacity of ribbed and sand-filled tube pilesDai Qingbin（Wenzhou Vocational & Technical College, Wenzhou 325035, China）Abstract: Compared with prestressed concrete tube pile, the ribbed sand-filled tube pile can enhance the bearing capacity of the pile foundation. Based on load transfer model of pile-soil, the behavior of side resistance and displacement was analyzed, and the pile side soil layer load transfer function was obtained. The enhancement range of load bearing capacity was researched. Theoretic analysis and experiment results indicate that side resistance can enhance the bearing capacity of the pile foundation by using ribbed sand-filled tube pile. Through the load transfer model, the results of side resistance yield value and the corresponding displacement were derived reversely, which can provide reference for design. Simultaneously, the relationship of pile top resistance with the proportion of side resistance and pile end resistance was studied, which shows that a linear relationship holds between this proportion and pile top load.Keywords: ribbed sand-filled tube pile; bearing capacity; side resistance; end resistance作者简介：戴庆斌，工程硕士，讲师，Email:wz2002zj@126.com。参考文献［1］金国平，黄敏，邹宗煊，等. 扩大头带肋填砂预应力管桩的研究与应用［J］.建筑结构，2006，36(S1):57-61.［2］黄敏,龚晓南.一种带翼板预应力管桩及其性能初步研究［J］. 土木工程学报,2005, 38(5):59-62.［3］黄敏,龚晓南. 带翼板预应力管桩承载性能的模拟分析［J］. 土木工程学报,2005, 38(2):102-105.［4］肖宏彬,钟辉虹,张亦静，等.单桩荷载沉降关系的数值模拟方法［J］.岩土力学,2002,23(5):592-596.［5］肖宏彬，张春顺.桩端土和桩侧土在荷载传递过程中的相互强化［J］.株洲工学院学报，2006，20(2):75-79.［6］温州市建筑设计研究院.扩大头带肋填砂预应力管桩的研究与应用鉴定报告［R］.2005：9-16.［7］戴庆斌,施均彬.预应力混凝土管桩轴向力测试及计算方法［J］.浙江工贸职业技术学院学报,2004, 5(1)：53-55.［8］苏振明.预应力管桩荷载传递特性［J］.建筑科学,2005,21(1):88-93.［9］朱百里,沈珠江.计算土力学［M］.上海：上海科学技术出版社，1990：223-268.［10］刘利民,张建新.灌注桩临界位移的探讨［J］. 岩土工程技术,1997(3): 19-21.［11］杨敏，王树娟，王钧，等.使用Geddes应力系数公式求解单桩沉降的讨论［J］.同济大学学报,1997,4 (3):71-74.［12］GEDDES J D. Stresses in foundation soils due to vertical subsurface load ［J］. Geotechnique, 1966,16(3): 231-255.［13］GB50007—2002建筑地基基础设计规范［M］.北京：中国建筑工业出版社，2002：140-143.［14］金明，龚维明，葛建光.砂土中超长桩承载性试验［J］.建筑结构，2011,41(1):114-117.
