液化地基中重力式码头地震残余变形计算法的动力试验验证
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摘要
液化地基中海港码头工程的地震残余变形的预测是地震工程安全设计中重要的环节,码头身后回填砂土因地震作用引起的超静孔隙水压力发展水平对码头地震变形有着重要的影响。引用液化度指标衡量超静孔隙水压力的变化特征,计算码头作旋转和滑动运动的地震残余变形的方法称为拟动力法,通过应用1g-振动台试验与120g-离心振动台试验的两模型测试结果验证计算码头地震残余变形的拟动力理论方法的合理性与可靠性。计算结果表明当计算中采用的地震动输入加速度与试验相同时,预测出的位移变化规律以及残余变形的计算值与测试值规律具有较好的一致性,表明对于均匀波动的地震载荷,该方法预测的地震残余变形较理想。
Predicting the seismic residual deformation of a quay wall induced by earthquake load is important in seismic safety design.The seismic deformation of a quay wall is significantly influenced by the development of excess pore water pressure in the backfill sand behind the quay wall.In a previous study,a pseudo-dynamic method for calculating the seismic residual deformation was provided,in which the index of liquefaction extent was applied to consider the effect of excess pore water pressure in the backfill soil for the motion of gravity quay wall during earthquake.The rationality and the reliability of the prediction method are validated by a 1g-shaking table model test results and a 120g-centrifuge shaking table model test.The results show consistency between the calculation values and the test values,indicating that the method is rational for calculation of the seismic residual deformation of quay walls.
Predicting the seismic residual deformation of a quay wall induced by earthquake load is important in seismic safety design.The seismic deformation of a quay wall is significantly influenced by the development of excess pore water pressure in the backfill sand behind the quay wall.In a previous study,a pseudo-dynamic method for calculating the seismic residual deformation was provided,in which the index of liquefaction extent was applied to consider the effect of excess pore water pressure in the backfill soil for the motion of gravity quay wall during earthquake.The rationality and the reliability of the prediction method are validated by a 1g-shaking table model test results and a 120g-centrifuge shaking table model test.The results show consistency between the calculation values and the test values,indicating that the method is rational for calculation of the seismic residual deformation of quay walls.
引文
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[3]王丽艳,刘汉龙.可液化回填土中重力码头地震旋转残余角位移的拟动力法计算[J].土木工程学报,2009,42(10):97-103(Wang Liyan,Liu Hanlong.Calculation ofthe seismic residual angular displacement of gravity quaywall in liquefiable backfill soil by using pseudo-dynamicmethod[J].China Civil Engineering Journal,2009,42(10):97-103(in Chinese))
[4]王丽艳,刘汉龙,蔡艳.用液化度概念评价岩土结构地震液化变形的探讨[J].防灾减灾工程学报,2007,27(4):451-456(Wang Liyan,Liu Hanlong,Cai Yan.Discussion on assessment of earth-strucrure liquefactiondeformation based on the concept degree of liquefaction[J].Journal of Disaster Prevention and MitigationEngineering,2007,27(4):451-456(in Chinese))
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[6]Kim S R,Jang I S,Chung C K,et al.Evaluation ofseismic displacements of quay walls[J].Soil Dynamicsand Earthquake Engineering,2005,25(6):451-459
[7]Lee C J.Centrifuge modeling of the behavior of caisson-type quay walls during earthquakes[J].Soil Dynamics andEarthquake Engineering,2005,25(2):117-131
[2]ISO 23469:2005 Bases for design of structures—seismicactions for designing geotechnical works[S]
[3]王丽艳,刘汉龙.可液化回填土中重力码头地震旋转残余角位移的拟动力法计算[J].土木工程学报,2009,42(10):97-103(Wang Liyan,Liu Hanlong.Calculation ofthe seismic residual angular displacement of gravity quaywall in liquefiable backfill soil by using pseudo-dynamicmethod[J].China Civil Engineering Journal,2009,42(10):97-103(in Chinese))
[4]王丽艳,刘汉龙,蔡艳.用液化度概念评价岩土结构地震液化变形的探讨[J].防灾减灾工程学报,2007,27(4):451-456(Wang Liyan,Liu Hanlong,Cai Yan.Discussion on assessment of earth-strucrure liquefactiondeformation based on the concept degree of liquefaction[J].Journal of Disaster Prevention and MitigationEngineering,2007,27(4):451-456(in Chinese))
[5]王丽艳.可液化砂土中重力式码头地震残余变形的计算方法研究[D].南京:河海大学,2008(Wang Liyan.Study in calculating methods of seismic residual deformationof gravity quay wall with liquefied sand[D].Nanjing:Hohai University,2008(in Chinese))
[6]Kim S R,Jang I S,Chung C K,et al.Evaluation ofseismic displacements of quay walls[J].Soil Dynamicsand Earthquake Engineering,2005,25(6):451-459
[7]Lee C J.Centrifuge modeling of the behavior of caisson-type quay walls during earthquakes[J].Soil Dynamics andEarthquake Engineering,2005,25(2):117-131
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