36
施工技术
CONSTRUCTIONTECHNOLOGY
2012年1月上第41卷第356期
科威特Boubyan岛海港工程公路桥预备桩试桩分析
鲍树峰，刘永锋
（中交四航工程研究院有限公司，广东广州510230）
【摘要】基于科威特Boubyan岛海港工程公路桥预备桩OCPPT-01试桩工程，采用新技术SoniCaliper法进行了桩基成孔质量检测；当桩身混凝土抗压强度达到46.2MPa时，采用低应变法和跨孔超声波透射法（CSL法）进行了桩基完整性检测；最后，采用O-eell法进行了单桩竖向承载力测试。测试结果表明：①成孔质量良好，垂直度偏差仅为 1/250；②桩身混凝土质量均匀，完整性良好；③基于0-cell法测试曲线的等效转换曲线P-s曲线可知，2.5倍工作荷载下（即15.75MN），桩顶况降值为28mm，满足设计要求。
【关键调］桥梁工程；桩基础；试桩；SoniCaliper技术；O-cell法；跨孔超声波透射法
【中图分类号】TU473.1
【文献标识码】A
【文章编号】1002-8498(2012)01-0036-06
Field Test Results Analysis of Preliminary Pile of HighwayBridge of
Boubyan Island Seaport Project in Kuwait
Bao Shufeng，LiuYongfeng
(CCCCFourth HarborEnginering lastitute Co.,Lid.,Guangzhou，Guangdong510230,China)
Abstract: For the preliminary pile OCPPT-1 of highway bridge of Boubyan Island Seaport in Kuwait, the pile excavation test is performed by SoniCaliper method. When the concrete unconfined compressive strength is reported to be 46. 2 MPa, the pile integrity test is performed by the low strain method and the crosshole sonie logs method( CSL method). Then the pile loading test is performed by the O-cell method. It can be concluded by analyzing the test results that: based on the closest caliper ring to pile tip, an excavation verticality based on centre offset would be approximately 1 in 250 from the datum ring elevation; ②in general, the pile concrete is of reliable integrity and sound in the pile tested, and there is no evidence of any major detrimental impedance changes in any of the records obtained, and therefore within the known capabilities of the test pile appears satisfactory with no obvious indication of any pile defects; based on the estimated top load curve, for a top loading of 15.75 MN (namely 2.5 times larger than the working load), the adjusted test data indicate this pile would displace approximately 28. Omm, which is not beyond the design requirement.
Key words:bridges; piles; piles testing; SoniCaliper technology; O-cell method; CSL method
工程概况 1
科威特Boubyan岛海港工程公路桥位于科威特的东北方和波斯湾的西北方，从科威特主岛（mainland）横跨KhawrSubiya海峡到Boubyan岛，全长1.42km，桩基础形式为钻孔灌注桩，桩径为 1.5~2.5m，桩长为28.0~57.0m。
根据工程地质勘察报告"]可知，科威特主岛（mainland）、KhawrSubiya海峡以及Boubyan岛三个区域的土层条件相差较大。①科威特主岛
【收稿日期】2011-07-07
【作者简介】施树峰，中交四航工程研究院有限公司工程师，广州市海珠区工业大道南大平图5号510280，电话：13609020225，E-mail：
bshufeng@ gapce. com 万方数据
（mainland）段公路桥沿线的土层从上至下依次为中密~密实细砂层、中硬~硬粉质黏土层；②Khawr Subiya海峡段从上至下依次为砂/砾性黏土层、中密~密实砂层（含坚硬黏土/粉土夹层）、局部夹杂一层薄的非常密实、细~粗砾石层：③Boubyan岛段，从上至下依次为3~26m厚的极软~软黏土/粉土层（表层为1~2m厚的干燥、已氧化粉土/黏土盐壳层）、密实~非常密实的细砂层、局部夹杂着一层较薄的硬～坚硬的黏土层。
经调研，该工程附近无相应的桩基础施工资料、试桩资料以及相关文献资料"]。为了获取更合适的桩基施工工艺和设计参数，需进行2根预备桩