管桩低应变检测中的三维效应分析
|
摘要
建立了三维柱坐标下桩土系统瞬态振动的计算模型,根据弹性动力学方程、边界条件和初始条件,确立了定解问题.利用交错网格有限差分法编制了相应计算程序,得出该定解问题的数值解,探讨了完整桩在竖向激振力作用下的瞬态动力响应,给出了桩顶不同位置的速度时程灰度图,并比较了桩顶与桩底各点竖向速度时程曲线的差别.基于管桩的低应变完整性测试数据,验证了该数值算法的可靠性及其反映波在管桩中传播的三维效应的可行性.在实际检测过程中,特别是在三维波动方程无法求得解析解的条件下,该数值计算结果具有一定的指导意义.
A real three dimensional(3-D) pile-soil model under cylindrical coordinate system is established in order to get a deep understanding of low strain integrity testing of pipe pile.According to elastodynamic equations,boundary conditions and initial conditions,the definite solution of this problem can be obtained.Then,based on the staggered grid finite difference method,the transient dynamic responses of a pipe pile subjected to transient vertical loading are discussed.Not only the velocities of different angles at pile top are obtained,but also the testing curves are presented,which directly reflects the 3-D effects of wave propagating in the pipe pile.Finally,the accuracy and feasibility of the numerical method are verified via comparing with the experimental data.In practice,especially under the conditions that the analytical solution of 3-D elastodynamic equations cannot be derived,the numerical solution has certain guiding significance.
A real three dimensional(3-D) pile-soil model under cylindrical coordinate system is established in order to get a deep understanding of low strain integrity testing of pipe pile.According to elastodynamic equations,boundary conditions and initial conditions,the definite solution of this problem can be obtained.Then,based on the staggered grid finite difference method,the transient dynamic responses of a pipe pile subjected to transient vertical loading are discussed.Not only the velocities of different angles at pile top are obtained,but also the testing curves are presented,which directly reflects the 3-D effects of wave propagating in the pipe pile.Finally,the accuracy and feasibility of the numerical method are verified via comparing with the experimental data.In practice,especially under the conditions that the analytical solution of 3-D elastodynamic equations cannot be derived,the numerical solution has certain guiding significance.
引文
[1]赵振东,杉本三千雄,铃木善雄.桩基低应变完整性检测的分析研究[J].地震工程与工程振动,1995,15(4):104.Zhao Zhendong,Sugimoto Michio,Suzuki Yoshio.Analyticalstudy on low strain integrity testing for piles[J].EarthquakeEngineering and Engineering Vibration,1995,15(4):104.
[2]Liao S T,Roesset J M.Dynamic response of intact piles toimpulse loads[J].International Journal for Numerical andAnalytical Methods in Geomechanics,1997,21(4),255.
[3]陈凡,王仁军.尺寸效应对基桩低应变完整性检测的影响[J].岩土工程学报,1998,20(5):92.CHEN Fan,WANG Renjun.Dimension effect on low strainintegrity testing of piles[J].Chinese Journal of GeotechnicalEngineering,1998,20(5):92.
[4]陈凡,罗文章.预应力管桩低应变反射波法检测时的尺寸效应研究[J].岩土工程学报,2004,26(3):353.CHEN Fan,LUO Wenzhang.Dimension effect on low strainintegrity testing of prestressed pipe piles[J].Chinese Journalof Geotechnical Engineering,2004,26(3):353.
[5]肖兰喜,朱元清,郝爱民.弹性波反射法在桩基检测应用中的三维有限元模拟[J].土工基础,1999,13(4):16.XIAO Lanxi,ZHU Yuanqing,HAO Aimin.3D FEM analysissimulation of elastic wave reflection method used in pilefoundation monitoring[J].Soil Engineering and Foundation,1999:13(4):16.
[6]Chow Y K,Phoon K K,Chow W F,et al.Low strain integritytesting of piles:three-dimensional effects[J].Journal ofGeotechnical and Geoenvironmental Engineering,2003,129(11):1057.
[7]黄大治,陈龙珠.钢筋混凝土管桩反射波法的三维有限元分析[J].岩土力学,2005,26(5):803.HUANG Dazhi,CHEN Longzhu.3D finite element analysis ofreflected waves in concrete pipe pile with defects[J].Rockand Soil Mechanics,2005,26(5):803.
[8]费康,刘汉龙,张霆.PCC桩低应变检测中的三维效应[J].岩土力学,2007,28(6):1095.FEI Kang,LIU Hanlong,ZHANG Ting.Three-dimensionaleffects in low strain integrity test of PCC pile[J].Rock andSoil Mechanics,2007,28(6):1095.
[9]刘东甲.完整桩瞬态纵向振动的模拟计算[J].合肥工业大学学报:自然科学版,2000,23(5):683.LIU Dongjia.Simulation and calculation of transientlongitudinal vibration of integrate piles[J].Journal of HefeiUniversity of Technology:Natural Science Edition,2000,23(5):683.
[10]陈义全,任志国,刘东甲.非完整桩瞬态纵向振动的模拟计算[J].合肥工业大学学报:自然科学版,2004,27(10):1210.CHEN Yiquan,REN Zhiguo,LIU Dongjia.Simulation andcalculation of transient longitudinal vibration of non-integratepiles[J].Journal of Hefei University of Technology:NaturalScience Edition,2004,27(10):1210.
[11]柯宅邦,刘东甲,廖旭涛.非完整桩扭转振动问题的数值计算[J].合肥工业大学学报:自然科学版,2005,28(11):1446.KE Zhaibang,LIU Dongjia,LIAO Xutao.Numerical calculationof torsional vibration of intact piles[J].Journal of HefeiUniversity of Technology:Natural Science Edition,2005,28(11):1446.
[12]柯宅邦,刘东甲.低应变反射波法测桩的轴对称问题数值计算[J].岩土工程学报,2006,28(12):2111.KE Zhaibang,LIU Dongjia.Numerical computation ofaxisymmetric problems in low strain integrity tests on piles[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2111.
[13]卢志堂,刘东甲,龙丽丽,等.基桩低应变检测三维问题的数值计算[J].合肥工业大学学报:自然科学版,2011,34(6):905.LU Zhitang,LIU Dongjia,LONG Lili,et al.3-D numericalcomputation for low strain integrity testing of piles[J].Journalof Hefei University of Technology:Natural Science Edition,2011,34(6):905.
[2]Liao S T,Roesset J M.Dynamic response of intact piles toimpulse loads[J].International Journal for Numerical andAnalytical Methods in Geomechanics,1997,21(4),255.
[3]陈凡,王仁军.尺寸效应对基桩低应变完整性检测的影响[J].岩土工程学报,1998,20(5):92.CHEN Fan,WANG Renjun.Dimension effect on low strainintegrity testing of piles[J].Chinese Journal of GeotechnicalEngineering,1998,20(5):92.
[4]陈凡,罗文章.预应力管桩低应变反射波法检测时的尺寸效应研究[J].岩土工程学报,2004,26(3):353.CHEN Fan,LUO Wenzhang.Dimension effect on low strainintegrity testing of prestressed pipe piles[J].Chinese Journalof Geotechnical Engineering,2004,26(3):353.
[5]肖兰喜,朱元清,郝爱民.弹性波反射法在桩基检测应用中的三维有限元模拟[J].土工基础,1999,13(4):16.XIAO Lanxi,ZHU Yuanqing,HAO Aimin.3D FEM analysissimulation of elastic wave reflection method used in pilefoundation monitoring[J].Soil Engineering and Foundation,1999:13(4):16.
[6]Chow Y K,Phoon K K,Chow W F,et al.Low strain integritytesting of piles:three-dimensional effects[J].Journal ofGeotechnical and Geoenvironmental Engineering,2003,129(11):1057.
[7]黄大治,陈龙珠.钢筋混凝土管桩反射波法的三维有限元分析[J].岩土力学,2005,26(5):803.HUANG Dazhi,CHEN Longzhu.3D finite element analysis ofreflected waves in concrete pipe pile with defects[J].Rockand Soil Mechanics,2005,26(5):803.
[8]费康,刘汉龙,张霆.PCC桩低应变检测中的三维效应[J].岩土力学,2007,28(6):1095.FEI Kang,LIU Hanlong,ZHANG Ting.Three-dimensionaleffects in low strain integrity test of PCC pile[J].Rock andSoil Mechanics,2007,28(6):1095.
[9]刘东甲.完整桩瞬态纵向振动的模拟计算[J].合肥工业大学学报:自然科学版,2000,23(5):683.LIU Dongjia.Simulation and calculation of transientlongitudinal vibration of integrate piles[J].Journal of HefeiUniversity of Technology:Natural Science Edition,2000,23(5):683.
[10]陈义全,任志国,刘东甲.非完整桩瞬态纵向振动的模拟计算[J].合肥工业大学学报:自然科学版,2004,27(10):1210.CHEN Yiquan,REN Zhiguo,LIU Dongjia.Simulation andcalculation of transient longitudinal vibration of non-integratepiles[J].Journal of Hefei University of Technology:NaturalScience Edition,2004,27(10):1210.
[11]柯宅邦,刘东甲,廖旭涛.非完整桩扭转振动问题的数值计算[J].合肥工业大学学报:自然科学版,2005,28(11):1446.KE Zhaibang,LIU Dongjia,LIAO Xutao.Numerical calculationof torsional vibration of intact piles[J].Journal of HefeiUniversity of Technology:Natural Science Edition,2005,28(11):1446.
[12]柯宅邦,刘东甲.低应变反射波法测桩的轴对称问题数值计算[J].岩土工程学报,2006,28(12):2111.KE Zhaibang,LIU Dongjia.Numerical computation ofaxisymmetric problems in low strain integrity tests on piles[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2111.
[13]卢志堂,刘东甲,龙丽丽,等.基桩低应变检测三维问题的数值计算[J].合肥工业大学学报:自然科学版,2011,34(6):905.LU Zhitang,LIU Dongjia,LONG Lili,et al.3-D numericalcomputation for low strain integrity testing of piles[J].Journalof Hefei University of Technology:Natural Science Edition,2011,34(6):905.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心