基桩低应变检测三维问题的数值计算
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摘要
为更好地服务于基桩低应变测试,文章建立了三维条件下桩土系统瞬态振动计算模型。利用交错网格有限差分法求解三维弹性波动方程,得出了完整桩在瞬态竖向激振力作用下的动力响应,给出了桩顶不同位置的速度时程图,比较分析了一维(1-D)、三维(3-D)条件速度响应的差别,直观地反映了波在桩中的传播特点,对工程实践具有指导意义。
A three-dimensional(3-D) computation model for the transient vibration of pile-soil system is established in order to get a better effect of low strain integrity testing of piles.The staggered grid finite difference method is used to solve 3-D elastic wave equations,and the dynamic responses of the integrate pile under transient vertical excitation force are obtained.The velocity history graph of different positions at the top of the pile is shown,and one-dimensional(1-D) velocity response and 3-D velocity response in the time domain are compared.The results directly reflect the features of wave propagation in the pile and can be a reference in engineering practice.
A three-dimensional(3-D) computation model for the transient vibration of pile-soil system is established in order to get a better effect of low strain integrity testing of piles.The staggered grid finite difference method is used to solve 3-D elastic wave equations,and the dynamic responses of the integrate pile under transient vertical excitation force are obtained.The velocity history graph of different positions at the top of the pile is shown,and one-dimensional(1-D) velocity response and 3-D velocity response in the time domain are compared.The results directly reflect the features of wave propagation in the pile and can be a reference in engineering practice.
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):104-111.
[2]Liao S T,Roesset J M.Dynamic response of intact piles toimpulse loads[J].Int J Numer Analyt Meth Geomech,1997,21:255-275.
[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):92-96.
[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):353-356.
[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):16-24.
[6]Chow Y K,Phoon K K,Chow W F,et al.Low strain integ-rity testing of piles:three-dimensional effects[J].Journal ofGeotechnical and Geoenvironmental Engineering,2003,129(11):1057-1062.
[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):804-808.
[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):1095-1102.
[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):683-687.
[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):1210-1214.
[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):1446-1448.
[12]龙丽丽,刘东甲,卢志堂,等.基于Timoshenko梁模型的完整桩瞬态横向振动模拟计算[J].合肥工业大学学报:自然科学版,2011,34(3):403-407.
[13]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):2111-2115.
[14]Schubert F,Koehler B.Three-dimensional time domainmodeling of ultrasonic wave propagation in concrete in ex-plicit consideration of aggregates and porosity[J].J Com-put Acoust,2001,9(4):1543—1560.
[2]Liao S T,Roesset J M.Dynamic response of intact piles toimpulse loads[J].Int J Numer Analyt Meth Geomech,1997,21:255-275.
[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):92-96.
[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):353-356.
[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):16-24.
[6]Chow Y K,Phoon K K,Chow W F,et al.Low strain integ-rity testing of piles:three-dimensional effects[J].Journal ofGeotechnical and Geoenvironmental Engineering,2003,129(11):1057-1062.
[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):804-808.
[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):1095-1102.
[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):683-687.
[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):1210-1214.
[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):1446-1448.
[12]龙丽丽,刘东甲,卢志堂,等.基于Timoshenko梁模型的完整桩瞬态横向振动模拟计算[J].合肥工业大学学报:自然科学版,2011,34(3):403-407.
[13]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):2111-2115.
[14]Schubert F,Koehler B.Three-dimensional time domainmodeling of ultrasonic wave propagation in concrete in ex-plicit consideration of aggregates and porosity[J].J Com-put Acoust,2001,9(4):1543—1560.
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