低应变动测曲线反演桩-土相互作用参数的试验研究
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摘要
选用黄河砂、黄土作为桩侧土进行桩-土相互作用的室内试验研究,利用WaveRunner 44Xi示波器接收桩顶加速度数字信号,用回传射线矩阵法反演不同密实状态下桩侧土的阻尼系数和刚度系数。试验结果表明:土越密实,桩侧阻尼系数和刚度系数都会增大,密实度相对较小时,阻尼系数增大较快,密实度相对较大时,两者增大量相当。
Yellow River sand and loess were taken as pile-side soil to study the interaction of pile-soil with laboratory tests. The acceleration digital signals at the top of pile were received using a WaveRunner 44 Xi oscilloscope.The reverberation-ray matrix method was applied to invert damping and stiffness coefficients of pile-side soil under different compacting conditions. The test results showed that the denser the soil,the larger the damping coefficients and stiffness ones; damping coefficients grow faster when soil is looser,but two coefficients' growth is nearly equal when soil is denser.
Yellow River sand and loess were taken as pile-side soil to study the interaction of pile-soil with laboratory tests. The acceleration digital signals at the top of pile were received using a WaveRunner 44 Xi oscilloscope.The reverberation-ray matrix method was applied to invert damping and stiffness coefficients of pile-side soil under different compacting conditions. The test results showed that the denser the soil,the larger the damping coefficients and stiffness ones; damping coefficients grow faster when soil is looser,but two coefficients' growth is nearly equal when soil is denser.
引文
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[17]中华人民共和国水利部.土工试验规程:SL237—1999[S].北京:中国水利水电出版社,1999.
[2]NOVAK M.Vertical vibration of floating piles[J].Journal of the Engineering Mechanics Division,ASCE,1977,103:153-168.
[3]刘东甲.纵向振动桩侧壁切应力频率域解及其应用[J].岩土工程学报,2001,23(5):544-546.LIU Dongjia.Frequency-domain solution of shear stress along pile-soil interface for longitudinal of piles and its application[J].Chinese Journal of Geotechnical Engineering,2001,23(5):544-546.
[4]蔡靖,张献民,王建华.基桩完整性检测中桩土相互作用参数的试验研究[J].岩土工程学报,2006,28(5):617-621.CAI Jing,ZHANG Xianmin,WANG Jianhua.Experimental study on pile-soil interaction parameter in pile integrity test[J].Chinese Journal of Geotechnical Engineering,2006,28(5):617-621.
[5]王建华,智胜英.低应变条件下桩土相互作用的阻尼系数[J].岩石力学与工程学报,2007,26(9):1800-1808.WANG Jianhau,ZHI Shengying.Damping ceofficients of pilesoil interaction with low strain[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(9):1800-1808.
[6]袁春辉,余云燕,鲍亦兴.桩底土与桩相互作用的模型试验研究[J].兰州交通大学学报,2010,29(1):106-111.YUAN Chunhui,YU Yunyan,PAO Y H.Model experimental study of pile-soil interaction at the bottem of pile[J].Chinese Journal of Lanhou Jiaotong University,2010,29(1):106-111.
[7]袁春辉.桩-土相互作用土参数的室内模型试验研究[D].兰州:兰州交通大学,2010.
[8]曹俊伟.土阻尼系数对基桩质量检测影响的试验研究[D].兰州:兰州交通大学,2010.
[9]王奎华,谢康和,曾国熙.有限长桩受迫振动问题解析解及其应用[J].岩土工程学报,1997,19(6):27-35.WANG Kuihua,XIE Kanghe,ZENG Guoxi.Analytical solution to vibration of finite length pile under exciting force and its application[J].Chinese Journal of Geotechnical Engineering,1997,19(6):27-35.
[10]王宏志,陈云敏,陈仁朋.多层土中桩的振动半解析解[J].振动工程学报,2000,13(4):660-665WANG Hongzhi,CHEN Yunmin,CHEN Renpeng.Semianalytical solution for response of pile in multi-larered soil under impact force and its simulation[J].Chinese Journal of Vibration Engineering,2000,13(4):660-665.
[11]Pao Y H,Yu Yunyan.Attenuation and damping of multireflected transient elastic waves in a pile[J].Journal of Engineering Mechanics,ASCE,2011,137(8):571-579.
[12]PAO Y H,KEH D K.Dynamic response and wave propagation in plane trusses and frames[J].AIAA Journal,1999,37(5):594-603.
[13]CHEN J F,PAO Y H.Effects of causality and joint conditions on method of reverberation-ray matrix[J].AIAA Journal,2003,41(6):1138-1142.
[14]余云燕,余莉芬.成层土中半埋入完整桩的瞬态波动响应研究[J].固体力学学报,2009,30(6):627-636.YU Yunyan,YU Lifen.Transient wave response of an integrated pile partially embedded in layered soil[J].Acta Mechnica Solida Sinica,2009,30(6):627-636.
[15]余云燕,姚栋.基于回传射线矩阵法成层土中部分埋入黏弹性桩的波动响应研究[J].振动与冲击,2015,34(14):56-64.YU Yunyan,YAO Dong.Transient wave response of a viscouse-elastic pile partially embedded in layered soil based on the method of reverberation-ray matrix[J].Journal of Vibration and Shock,2015,34(14):56-64.
[16]陈进浩,余云燕.框架结构瞬态波动响应及自振频率的回传射线矩阵法分析[J].振动与冲击,2016,35(10):83-90.CHEN Jinhao,YU Yunyan.Analysis of the transient response and natural frequency of a frame by the reverberation-ray matrix method[J].Journal of Vibration and Shock,2016,35(10):83-90.
[17]中华人民共和国水利部.土工试验规程:SL237—1999[S].北京:中国水利水电出版社,1999.