南京片状细砂不排水循环三轴试验的数值仿真
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摘要
基于软件ABAQUS的二次开发平台,引入Byrne修正的Martin和Finn孔压应变模型,并与土体动力黏塑性记忆型嵌套面模型相结合,通过编制Fortran子程序,嵌入到软件ABAQUS中,实现了软件ABAQUS的有效应力算法,对南京片状细砂土的不排水循环三轴试验进行三维数值仿真。通过与循环三轴试验结果的比较,发现数值模拟结果基本上能再现南京片状细砂的不排水循环特性,如不排水循环三轴试验的动应力?应变关系、应变累积、应变软化等;且数值仿真结果较好地反映了试验结果的振动孔压发展特征。研究的意义在于理想三维数值模拟试验能够突破常规的室内土工试验能力及其局限性,这为今后饱和砂土不排水循环特性的宏、细观机理的进一步研究奠定了基础。
Based on the ABAQUS finite-element software,the Martin and Finn pore-water pressure-strain model modified by Byrne is inset into the viscous-plastic memorial nested yield surface dynamic constitutive model and the modified constitutive model is developed according to the further developing platform,and an effective stress calculating method is implemented.By means of the three-dimensional numerical model,the cyclic triaxial undrained shear tests of flake-shaped Nanjing fine sand soil are simulated by using ABAQUS with the modified constitutive model.Comparing the numerical simulation results with the cyclic triaxial test results,the undrained dynamic properties of the flake-shaped Nanjing fine sand soil,such as dynamic stress-strain relationship,stain accumulation and stain softening appear.For the development of pore water pressure,good agreement between the results of numerical simulations and laboratory tests is shown.It is shown that the numerical method is feasible for simulating the dynamic stress-strain behavior and the pore-water pressure development of Nanjing fine sand under cyclic loading.The meaning of this research lies on the fact that three-dimensional numerical simulation of cyclic triaxial tests can break through the limits of real lab tests.In addition,it will be helpful to the study of the application of the geotechnical problems in future.
Based on the ABAQUS finite-element software,the Martin and Finn pore-water pressure-strain model modified by Byrne is inset into the viscous-plastic memorial nested yield surface dynamic constitutive model and the modified constitutive model is developed according to the further developing platform,and an effective stress calculating method is implemented.By means of the three-dimensional numerical model,the cyclic triaxial undrained shear tests of flake-shaped Nanjing fine sand soil are simulated by using ABAQUS with the modified constitutive model.Comparing the numerical simulation results with the cyclic triaxial test results,the undrained dynamic properties of the flake-shaped Nanjing fine sand soil,such as dynamic stress-strain relationship,stain accumulation and stain softening appear.For the development of pore water pressure,good agreement between the results of numerical simulations and laboratory tests is shown.It is shown that the numerical method is feasible for simulating the dynamic stress-strain behavior and the pore-water pressure development of Nanjing fine sand under cyclic loading.The meaning of this research lies on the fact that three-dimensional numerical simulation of cyclic triaxial tests can break through the limits of real lab tests.In addition,it will be helpful to the study of the application of the geotechnical problems in future.
引文
[1]周健,池毓蔚,池永,等.砂土双轴试验的颗粒流模拟[J].岩土工程学报,2000,22(6):701-704.
[2]董明钢,范厚彬,胡志平.一种软粘土三轴流变试验的数值模拟技术[J].土工基础,2003,17(3):42-45.
[3]刘洋,周键,吴顺川.循环荷载下砂土变形的细观数值模拟I:松砂试验结果[J].岩土工程学报,2007,29(7):1035-1041.
[4]刘洋,吴顺川,周键.循环荷载下砂土变形的细观数值模拟Ⅱ:密砂试验结果[J].岩土工程学报,2007,29(11):1676-1682.
[5]陈育民,刘汉龙.邓肯-张本构模型在FLAC3D中的开发与实现[J].岩土力学,2007,28(10):2123-2126.
[6]范庆来,栾茂田,杨庆.修正剑桥模型的隐式积分算法在ABAQUS中的数值实施[J].岩土力学,2008,29(1):269-273.
[7]罗勇,龚晓南,连峰.三维离散颗粒单元模拟无黏性土的工程力学性质[J].岩土工程学报,2008,30(2):292-297.
[8]程建军,严三保,蒋建平,等.南京地铁南北线主要工程地质问题认识与评价[J].地球科学与环境学报,2004,26(1):46-51.
[9]陈文化,孙谋,刘明丽,等.南京砂的结构特性与地铁地基液化判别[J].岩土力学,2003,24(5):755-758.
[10]陈国兴,刘雪珠.循环荷载作用下南京片状细砂的不排水动力性态[J].岩土工程学报,2009,待发表
[11]ABAQUS.Finite element computer program.Theory Manual,Version 6.4[M].Hibbert,Karlsson and Sorensen,Inc.,Pawtucket,RI,2004.
[12]Martin G B,Finn W D L,Seed HB.Fundamentals of liquefaction under cyclic loading[J].Journal of Geotechnical Engineering,ASCE,1975(5):423-438.
[13]Byrne P M.Acyclic shear-volume coupling and pore pressure model for sand[C]//Proceedings2nd International Conference on Recent Advancesin Geotechnical Earthquake Engineering and Soil Dynamics,St.Louis,Missouri,1991:47-55.
[14]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[15]庄海洋,陈国兴,朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,2(10):1267-1272.
[16]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.
[2]董明钢,范厚彬,胡志平.一种软粘土三轴流变试验的数值模拟技术[J].土工基础,2003,17(3):42-45.
[3]刘洋,周键,吴顺川.循环荷载下砂土变形的细观数值模拟I:松砂试验结果[J].岩土工程学报,2007,29(7):1035-1041.
[4]刘洋,吴顺川,周键.循环荷载下砂土变形的细观数值模拟Ⅱ:密砂试验结果[J].岩土工程学报,2007,29(11):1676-1682.
[5]陈育民,刘汉龙.邓肯-张本构模型在FLAC3D中的开发与实现[J].岩土力学,2007,28(10):2123-2126.
[6]范庆来,栾茂田,杨庆.修正剑桥模型的隐式积分算法在ABAQUS中的数值实施[J].岩土力学,2008,29(1):269-273.
[7]罗勇,龚晓南,连峰.三维离散颗粒单元模拟无黏性土的工程力学性质[J].岩土工程学报,2008,30(2):292-297.
[8]程建军,严三保,蒋建平,等.南京地铁南北线主要工程地质问题认识与评价[J].地球科学与环境学报,2004,26(1):46-51.
[9]陈文化,孙谋,刘明丽,等.南京砂的结构特性与地铁地基液化判别[J].岩土力学,2003,24(5):755-758.
[10]陈国兴,刘雪珠.循环荷载作用下南京片状细砂的不排水动力性态[J].岩土工程学报,2009,待发表
[11]ABAQUS.Finite element computer program.Theory Manual,Version 6.4[M].Hibbert,Karlsson and Sorensen,Inc.,Pawtucket,RI,2004.
[12]Martin G B,Finn W D L,Seed HB.Fundamentals of liquefaction under cyclic loading[J].Journal of Geotechnical Engineering,ASCE,1975(5):423-438.
[13]Byrne P M.Acyclic shear-volume coupling and pore pressure model for sand[C]//Proceedings2nd International Conference on Recent Advancesin Geotechnical Earthquake Engineering and Soil Dynamics,St.Louis,Missouri,1991:47-55.
[14]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[15]庄海洋,陈国兴,朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,2(10):1267-1272.
[16]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.
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