在役桥梁桩基础低应变反射波法检测试验研究
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摘要
低应变反射波法检测桩身完整性通常是在桩顶自由的情况下进行的,通过改进其检测方法,研究低应变反射波法检测在役桥梁桩基础完整性的可靠性。文中选取桥梁下部结构常用的单排双柱式墩、桩基础进行现场试验,采用不同激振方式和信号接收位置对在役桥梁桩基的低应变反射波法进行试验研究,且与桩顶自由时桩基完整性检测结果进行对比。根据试验结果及相关分析,各试验方案的实测曲线形态与理论分析具有较好的一致性,在现场试验中具有较好的效果,为在役桥梁桩基完整性检测提供了一种手段。
Low Strain Reflect Wave method is usually carried out to inspect pile integrity when the pile top is free.In order to improve this method,the reliability of the method used to inspect existing bridge pile integrity is studied.Through adopting different excitation and signal reception locations,and selecting the commonly used pile bent column pier in bridge substructure as test model,field tests are carried out by this method,then comparative analysis of test results with free pile top detection results are conducted.The analysis of experimental results show that the measured curve shape of different test schemes have good consistency with theoretical explanation.The research indicates that the Low Strain Reflect Wave method could be well used in inspecting existing bridge pile integrity.
Low Strain Reflect Wave method is usually carried out to inspect pile integrity when the pile top is free.In order to improve this method,the reliability of the method used to inspect existing bridge pile integrity is studied.Through adopting different excitation and signal reception locations,and selecting the commonly used pile bent column pier in bridge substructure as test model,field tests are carried out by this method,then comparative analysis of test results with free pile top detection results are conducted.The analysis of experimental results show that the measured curve shape of different test schemes have good consistency with theoretical explanation.The research indicates that the Low Strain Reflect Wave method could be well used in inspecting existing bridge pile integrity.
引文
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[3]JTJ249-2001港口工程桩基动力检测规程[S].
[4]徐攸在,刘家林,刘杰.用小应变动测法测定码头桩完整性的初步探讨[J].港口技术,2001,12(4):36-37.
[5]姜卫方,王培军,李熹,等.桩顶非自由端低应变动测法应用研究[J].工程地球物理学报,2006,3(3):16-21.
[6]苗永红,刘松玉,顾建祖.侧向激振下桩身完整性试验新方法探讨[J].世界地震工程,2009,25(4):141-144.
[7]徐仲达.地震波理论[M].上海:同济大学出版社,1997.
[8]柴华友,刘明贵,李祺,等.应力波在平台-桩系统中传播的实验研究[J].岩土力学,2002,23(4):459-464.
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