某砂土液化大变形本构模型参数的敏感性分析
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摘要
基于Yang和Ahmed[1-5]等提出的砂土液化大变形本构模型,对该模型的硬化规则和弹塑性模量确定方法作了改进,把该本构模型扩展应用到三维液化大变形的数值分析中,实现了基于ABAQUS大型商用软件计算平台上砂土液化大变形的计算子程序开发。基于该计算平台,对该模型的主要参数在描述砂土液化动孔隙水压力增长和动应力-应变关系曲线等方面的可靠性和敏感性进行了研究。给出了模型全过程参数、剪胀过程参数、剪缩与剪胀状态转换点流动变形量控制参数对试样的应力-应变关系曲线的影响程度及其规律,并对模型的主要参数的敏感性进行了分析,所得结论为通过动三轴试验获得相关模型参数提供了有效的指导和帮助,同时也发展了砂土液化大变形新的数值计算方法。
Based on the constitutive equations given by Yang and Ahmed et al. to predict the liquefied large deformation of sand,the hardening rule of model and the calculation method of elastoplastic modulus are modified.Then,it is extended to 3-D equations and is implemented by using Fortran subroutine program and is implanted into ABAQUS finite-element software.By using ABAQUS software with the advanced model,how the main model parameters to affect the dynamic pore pressures arising and the stress-strain curves of sand,are analyzed in detail,respectively.At the same time,the sensitivities of model parameters are also analyzed.It is proved that the subroutine program can work perfectly to model the liquefied large deformation of sand;and the combination of different model parameters' values can predict perfectly the different deformation stage of sand.These conclusions verified and given here can be used expediently to fixed the model parameters by using dynamic triaxial tests.Accordingly,a new effectively numerical method used to calculate the large liquefaction is advanced by using the advanced finite-element ABAQUS software with special constitutive model.
Based on the constitutive equations given by Yang and Ahmed et al. to predict the liquefied large deformation of sand,the hardening rule of model and the calculation method of elastoplastic modulus are modified.Then,it is extended to 3-D equations and is implemented by using Fortran subroutine program and is implanted into ABAQUS finite-element software.By using ABAQUS software with the advanced model,how the main model parameters to affect the dynamic pore pressures arising and the stress-strain curves of sand,are analyzed in detail,respectively.At the same time,the sensitivities of model parameters are also analyzed.It is proved that the subroutine program can work perfectly to model the liquefied large deformation of sand;and the combination of different model parameters' values can predict perfectly the different deformation stage of sand.These conclusions verified and given here can be used expediently to fixed the model parameters by using dynamic triaxial tests.Accordingly,a new effectively numerical method used to calculate the large liquefaction is advanced by using the advanced finite-element ABAQUS software with special constitutive model.
引文
[1]YANG Zhao-hui,AHMED ELGAMAL.Influence of permeability on liquefaction-induced shear deformation[J].Journal of Engineering Mechanics,2002,128(7):720-729.
[2]YANG Zhao-hui,AHMED ELGAMAL,PARRA ENDER.Properties of a phase-conjugate etalon mirror and its application to laser resonator spatial-mode control[J].Soil Dynamics and Earthquake Engineering,2002,22(4):259-271.
[3]YANG Zhao-hui,AHMED ELGAMAL,PARRA ENDER.Computational model for cyclic mobility and associated shear deformation[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,136(9):1119-1127.
[4]YANG ZHAOHUI,AHMED ELGAMAL.Application of unconstrained optimization and sensitivity analysis to calibration of a soil constitutive model[J].International Journal for Numerical and Analytical Methods in Geomechanics,2003,27(15):1255-1316.
[5]AHMED ELGAMAL,YANG ZHAOHUI,PARRA ENDER.Computation modeling of cyclic mobility and post-liquefaction site response[J].Soil Dynamic and Earthquake Engineering,2002,22(4):259-271.
[6]庄海洋,陈国兴.砂土液化大变形本构模型及在ABAQUS软件上的实现[J].世界地震工程,2011,27(2):45-50.ZHUANG Hai-yang,CHEN Guo-xing.The constitutive model for large liquefaction deformation of sand and implemented in ABAQUS software[J].Journal of Disaster Prevention and Mitigation Engineering,2011,2011,27(2):45-50.
[7]PREVOST J H.A simple plasticity theory for frictional cohesionless soils[J].Soil Dynamic and Earthquake Engineering,1985,4(1):9-17.
[8]庄海洋,陈国兴.对土体动力黏塑性记忆型嵌套面模型的改进[J].岩土力学,2009,30(1):118-122.ZHUANG Hai-yang,CHEN Guo-xing.Improvement of dynamic viscoplastic memorial nested yield surface model of soil[J].Rock and Soil Mechanics,2009,30(1):118-122.
[2]YANG Zhao-hui,AHMED ELGAMAL,PARRA ENDER.Properties of a phase-conjugate etalon mirror and its application to laser resonator spatial-mode control[J].Soil Dynamics and Earthquake Engineering,2002,22(4):259-271.
[3]YANG Zhao-hui,AHMED ELGAMAL,PARRA ENDER.Computational model for cyclic mobility and associated shear deformation[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,136(9):1119-1127.
[4]YANG ZHAOHUI,AHMED ELGAMAL.Application of unconstrained optimization and sensitivity analysis to calibration of a soil constitutive model[J].International Journal for Numerical and Analytical Methods in Geomechanics,2003,27(15):1255-1316.
[5]AHMED ELGAMAL,YANG ZHAOHUI,PARRA ENDER.Computation modeling of cyclic mobility and post-liquefaction site response[J].Soil Dynamic and Earthquake Engineering,2002,22(4):259-271.
[6]庄海洋,陈国兴.砂土液化大变形本构模型及在ABAQUS软件上的实现[J].世界地震工程,2011,27(2):45-50.ZHUANG Hai-yang,CHEN Guo-xing.The constitutive model for large liquefaction deformation of sand and implemented in ABAQUS software[J].Journal of Disaster Prevention and Mitigation Engineering,2011,2011,27(2):45-50.
[7]PREVOST J H.A simple plasticity theory for frictional cohesionless soils[J].Soil Dynamic and Earthquake Engineering,1985,4(1):9-17.
[8]庄海洋,陈国兴.对土体动力黏塑性记忆型嵌套面模型的改进[J].岩土力学,2009,30(1):118-122.ZHUANG Hai-yang,CHEN Guo-xing.Improvement of dynamic viscoplastic memorial nested yield surface model of soil[J].Rock and Soil Mechanics,2009,30(1):118-122.
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