非饱和黏土动力特性及等价黏弹性模型的试验研究
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摘要
针对非饱和重塑黏土,利用改进的非饱和土静力-动力液压三轴-扭转多功能剪切仪,在固结排水(CD)条件下进行了应力控制式分级加载的循环三轴试验,通过对试验结果的对比分析,探讨了初始固结压力和基质吸力(孔隙气压力Ua与孔隙水压力Uw之差)对非饱和土动应力-动应变关系特性的影响。以此为基础,将Hardin-Drnerich等价黏弹性模型和Masing加卸载准则进行了改进,并得到了可以考虑基质吸力的非饱和黏土的等价黏弹性模型。进而对试验数据与模型预测结果进行比较,结果表明这种改进的非饱和土等价黏弹性模型能较好预测各种基质吸力下非饱和土的动应力-动应变关系。
The improved static and dynamic universal triaxial and torsional shear apparatus for unsaturated soil is employed to perform step stress controlled cyclic triaxial tests under consolidated drained condition.Through a series of tests on unsaturated remoulded clay,the effects of initial confining pressure and matric suction(pore air pressure Ua pore water pressure Uw) on stress-strain behavior are examined.The equivalent viscoelastic model of unsaturated clay considering the influence of matric suction is recommended by improving the Hardin-Drnerich equivalent viscoelastic model and Masing loading and unloading criterion of saturated soil.Moreover,it is verified through comparing experimental data and former improved model that the recommended equivalent viscoelastic model of unsaturated clay can be used to predict the stress-strain behavior of unsaturated soil.
The improved static and dynamic universal triaxial and torsional shear apparatus for unsaturated soil is employed to perform step stress controlled cyclic triaxial tests under consolidated drained condition.Through a series of tests on unsaturated remoulded clay,the effects of initial confining pressure and matric suction(pore air pressure Ua pore water pressure Uw) on stress-strain behavior are examined.The equivalent viscoelastic model of unsaturated clay considering the influence of matric suction is recommended by improving the Hardin-Drnerich equivalent viscoelastic model and Masing loading and unloading criterion of saturated soil.Moreover,it is verified through comparing experimental data and former improved model that the recommended equivalent viscoelastic model of unsaturated clay can be used to predict the stress-strain behavior of unsaturated soil.
引文
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[4]陈铁林,米占宽,陈生水.膨胀土路基变形的数值模拟[J].岩土力学,2005,26(增):137-140.CHEN Tie-lin,MI Zhan-kuan,CHEN Sheng-shui.Numerical simulation of deformation of expansive soilroadbed[J].Rock and Soil Mechanics,2005,26(Supp.):137-140.
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[11]郑大同,望惠昌.循环荷载作用下土的非线性应力-应变模型[J].岩土工程学报,1983,5(1):65-76.ZHENG Da-tong,WANG Hui-chang.Nonlinear stress-strain models of soils under cyclic loadings[J].Chinese Jounal of Geotechnical Engineering,1983,5(1):65-76.
[12]杨超,杨林德,季倩倩.软黏土在循环荷载作用下动力本构模型的研究[J].岩土力学,2006,27(4):609-604.YANG Chao,YANG Lin-de,JI Qian-qian.Study of dynamic constitutive model of soft soils under cyclic load[J].Rock and Soil Mechanics,2006,27(4):609-604.
[13]栾茂田,郭莹,李木国,等.土工静力-动力液压三轴-扭转多功能剪切仪研发及应用[J].大连理工大学学报,2003,43(5):670-675.LUAN Mao-tian,GUO Ying,LI Mu-guo,et al.Development and application of soil static and dynamic universal triaxial and torsional shear apparatus[J].Journal of Dalian University of Technology,2003,43(5):670-675.
[14]李木国,刘振东,王静,等.土工静力-动力液压三轴扭转多功能剪切仪数据采集处理系统[J].岩石力学与工程学报,2005,24(2):5857-5861.LI Mu-guo,LIU Zhen-dong,WANG Jing,et al.System of computer data sampling and processing for soil static-dynamic universal triaxial and torsional shear apparatus[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(2):5857-5861.
[15]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[16]南京水利科学研究院.SL237-1999土工试验规程[S].北京:中国水利水电出版社,1999.
[2]AANDERSEN K H.Properties of soft clay under static and cyclic loading[C]//Proc.Intn’I Conf.Eng.Problems on Reg:Beijing:[s.n.],1988:7-26.
[3]ANDERSEN K H,LAURITZSEN R.Bearing capacity for foundations with cyclic load[J].ASCE,1988,114(5):540-555.
[4]陈铁林,米占宽,陈生水.膨胀土路基变形的数值模拟[J].岩土力学,2005,26(增):137-140.CHEN Tie-lin,MI Zhan-kuan,CHEN Sheng-shui.Numerical simulation of deformation of expansive soilroadbed[J].Rock and Soil Mechanics,2005,26(Supp.):137-140.
[5]王志良,韩清宇.黏弹塑性土层地震反应的波动分析法[J].地震工程与工程振动,1981,1(1):117-137.WANG Zhi-liang,HAN Qing-yu.Analysis of wave propagation for the site seismic response using the viscoelastioplastic model[J].Earthquake Engineering and Engineering Vibration,1981,1(1):117-137.
[6]吴仲谋.饱和砂土两相动力有效应力分析方法研究[博士学位论文D].北京:水利水电科学研究院,1988.
[7]栾茂田,林皋.场地地震反应一维非线性计算模型[J].工程力学,1992,9(1):94-103.LUAN Mao-tian,LIN Gao.Computational model for nonlinear analysis of soil site seimic response[J].Engineering Mechanics,1992,9(1):94-103.
[8]王志良,王余庆,韩清宇.不规则循环剪切荷载作用下土的黏弹性模型[J].岩土工程学报,1980,2(3):10-19.WANG Zhi-liang,WANG Qing-yu,HAN Qing-yu.Visco-elastoplastic soil model for irregular shear cyclic dynamic loadings[J].Chinese Jounal of Geotechnical Engineering,1980,2(3):10-19.
[9]IWAN W D.On a class of models for the yielding behavior of continuous and composite system.transactions of the ASME[J].Journal of Applied Mechanics,1967,34(3):20-25.
[10]李小军,廖振鹏,土应力-应变关系的黏-弹-塑模型[J].地震工程与工程振动,1989,9(3):65-72.LI Xiao-jun,LIAO Zhen-peng,Visco-elsto-plastic model of soil stress-strain relationship[J].Earthquake Engineering and Engineering Vibration,1989,9(3):65-72.
[11]郑大同,望惠昌.循环荷载作用下土的非线性应力-应变模型[J].岩土工程学报,1983,5(1):65-76.ZHENG Da-tong,WANG Hui-chang.Nonlinear stress-strain models of soils under cyclic loadings[J].Chinese Jounal of Geotechnical Engineering,1983,5(1):65-76.
[12]杨超,杨林德,季倩倩.软黏土在循环荷载作用下动力本构模型的研究[J].岩土力学,2006,27(4):609-604.YANG Chao,YANG Lin-de,JI Qian-qian.Study of dynamic constitutive model of soft soils under cyclic load[J].Rock and Soil Mechanics,2006,27(4):609-604.
[13]栾茂田,郭莹,李木国,等.土工静力-动力液压三轴-扭转多功能剪切仪研发及应用[J].大连理工大学学报,2003,43(5):670-675.LUAN Mao-tian,GUO Ying,LI Mu-guo,et al.Development and application of soil static and dynamic universal triaxial and torsional shear apparatus[J].Journal of Dalian University of Technology,2003,43(5):670-675.
[14]李木国,刘振东,王静,等.土工静力-动力液压三轴扭转多功能剪切仪数据采集处理系统[J].岩石力学与工程学报,2005,24(2):5857-5861.LI Mu-guo,LIU Zhen-dong,WANG Jing,et al.System of computer data sampling and processing for soil static-dynamic universal triaxial and torsional shear apparatus[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(2):5857-5861.
[15]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[16]南京水利科学研究院.SL237-1999土工试验规程[S].北京:中国水利水电出版社,1999.
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