寒区冻结冰碛土的变形特性与非线性本构模型研究
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摘要
为了研究寒区冰碛土的变形特性和本构模型,应用MTS-Landmark 370.10型动静三轴测试系统对冰碛土在温度为-3、-5℃,围压为0.1、0.5、1、4、8MPa时开展低温常规三轴试验。结果表明:冰碛土的应力应变关系曲线均为应变软化型,可分为线性、非线性和应变软化3个阶段;围压越大,软化现象越明显;随轴向应变的增加,试样先体缩再体胀。基于试验结果在沈珠江三参数模型和修正邓肯-张双曲线模型基础之上提出一种改进模型,将改进模型与沈珠江三参数模型、修正邓肯-张双曲线模型的拟合结果进行对比,发现改进模型能较好描述冻结冰碛土的应变软化现象和剪胀特性。
In order to study the deformation characteristics and constitutive model of frozen moraine soil in cold regions,the MTS-Landmark 370.10 type dynamic and static triaxial test system was applied to study the stress-strain curves and volumetric curves of frozen moraine soil at a temperatures of-3℃and-5 ℃ and confining pressures of 0.1、0.5、1、4 and 8 MPa.The results show that the stress-strain relationship of frozen moraine soil is a strain softening type,and it can be divided into 3 stages:linear,nonlinear and strain softening.The greater the confining pressure,the obvious the softening phenomenon.With the increase of axial strain,the volume of the sample contracts first,and then expands.Based on the experimental results,an improved model was proposed based on the three-parameter model of the Shen Zhujiang and the modified Duncan-Chang hyperbolic model.The calculation results of the improved model were compared with the calculation results of the three parameter model of Shen Zhujiang and the modified Duncan-Chang hyperbolic model.Results show that the improved model has good fitting effect and can be used to describe the strain softening and dilatancy characteristics of frozen moraine soil.
In order to study the deformation characteristics and constitutive model of frozen moraine soil in cold regions,the MTS-Landmark 370.10 type dynamic and static triaxial test system was applied to study the stress-strain curves and volumetric curves of frozen moraine soil at a temperatures of-3℃and-5 ℃ and confining pressures of 0.1、0.5、1、4 and 8 MPa.The results show that the stress-strain relationship of frozen moraine soil is a strain softening type,and it can be divided into 3 stages:linear,nonlinear and strain softening.The greater the confining pressure,the obvious the softening phenomenon.With the increase of axial strain,the volume of the sample contracts first,and then expands.Based on the experimental results,an improved model was proposed based on the three-parameter model of the Shen Zhujiang and the modified Duncan-Chang hyperbolic model.The calculation results of the improved model were compared with the calculation results of the three parameter model of Shen Zhujiang and the modified Duncan-Chang hyperbolic model.Results show that the improved model has good fitting effect and can be used to describe the strain softening and dilatancy characteristics of frozen moraine soil.
引文
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[15]马巍,王大雁.中国冻土力学研究50a回顾与展望[J].岩土工程学报,2012,34(4):625-640.Ma W,Wang D Y.Studies on frozen soil mechanics in China in past 50years and their prospect[J].Chinese Journal of Geotechnical Engineering,2012,34(4):625-640.(in Chinese)
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[18]沈珠江.应变软化材料的广义孔隙压力模型[J].岩土工程学报,1997,19(3):14-21.Shen Zh J.Generalized pore pressure model for strain softening materials[J].Chinese Journal of Geotechnical Engineering,1997,19(3):14-21.(in Chinese)
[19]Gitau A N,Gumbe L O,Biamah E K.Influence of soil water on stress-strain behaviour of a compacting soil in semi-arid Kenya[J].Soil&Tillage Research,2006,89(2):144-154.
[20]沈珠江.南京水利科学院土工研究报告汇编(1966~1978):第一分册[G].南京:南京水利科学院,1985:239-251.Shen Zh J.Compilation of geotechnical research report of Nanjing water conservancy academy(1966~1978):first volume[G].Nanjing:Nanjing Water Conservancy Academy,1985:239-251.(in Chinese)
[21]沈珠江.油罐地基固结变形的非线性分析[J].水利水运工程学报,1977(1):26-42.Shen Zh J.Nonlinear analysis of consolidation and deformation of oil tank foundation[J].Hydro-Science and Engineering,1977(1):26-42.(in Chinese)
[2]李公水,任剑,刘宏.康定机场冰碛土特性及地基处理[J].地质灾害与环境保护,2007(4):35-39.Li G Sh,Ren J,Liu H.Plateau moraine soil characteristics and its rein for cement methods[J].Journal of Geological Hazards and Environment Preservation,2007(4):35-39.(in Chinese)
[3]刘昌.西藏巴河冰碛物的工程特性[J].水力发电,1998(6):16-18.Liu Ch.Engineering characteristics of the Ba River Moraine in Tibet[J].Water Power,1998(6):16-18.(in Chinese)
[4]张梅,崔之久,刘耕年,等.青藏高原东南部贡嘎山海螺沟冰川冰下沉积物形成与变形[J].冰川冻土,2013,35(5):1143-1155.Zhang M,Cui Zh J,Liu G N,et al.Formation and deformation of subglacial deposits of Hailuogou glacier Mt.Gongga,Southeastern Tibetan Plateau[J].Journal of Glaciology and Geocryology,2013,35(5):1143-1155.(in Chinese)
[5]何迎红,屈智炯.冰碛土力学性质与微观结构的研究[J].成都科技大学学报,1990(5):57-62.He Y H,Qu Zh J.Mechanical property and microstructure research of glacial till[J].Journal of Chengdu University of Science and Technology,1990(5):57-62.(in Chinese)
[6]屈智炯,刘开明,肖晓军,等.冰碛土微观结构、应力应变特性及其模型研究[J].岩土工程学报,1992,14(6):19-28.Qu Zh J,Liu K M,Xiao X J,et al.Study of microstructure stress-strain behavior and constitutive model of till[J].Chinese Journal of Geotechnical Engineering,1992,14(6):19-28.(in Chinese)
[7]蒙进,屈智炯.高压下冰碛土的颗粒破碎及应力应变关系[J].成都科技大学学报,1989(1):17-22,56.Meng J,Qu Zh J.Particle breakage and stress-strain relationship of moraine soil under high pressure[J].Journal of Chengdu University of Science and Technology,1989(1):17-22,56.(in Chinese)
[8]李广信.关于土的本构模型研究的若干问题[J].岩土工程学报,2009,31(10):1636-1641.Li G X.Some problems in researches on constitutive model of soil[J].Chinese Journal of Geotechnical Engineering,2009,31(10):1636-1641.(in Chinese)
[9] Duncan J M.Nonlinear analysis of stress and strain in soils[J].Journal of the Soil Mechanics and Foundations Division,1970,96(5):1629-1653.
[10]Duncan J M,Byrne P,Wong K S,et al.Strength,stress-strain and bulk modulus parameters for finite element analysis of stress and movements in soil masses[J].Journal of Consulting&Clinical Psychology,1980,49(4):554-567.
[11]沈珠江.考虑剪胀性的土和石料的非线性应力应变模式[J].水利水运工程学报,1986(4):3-16.Shen Zh J.A nonlinear dilatant stress-strain model for soil and rock materials[J].Hydro-Science and Engineering,1986(4):3-16.(in Chinese)
[12]陈成,周正明.基于状态参数的砂土非线性弹性模型研究[J].岩石力学与工程学报,2013,32(2):369-376.Chen Ch,Zhou Zh M.Study of nonlinear elastic model of sandy soil based on state parameters[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(2):369-376.(in Chinese)
[13]王丽琴,鹿忠刚,邵生俊,等.黄土非线性应力-应变新模型及对比研究[J].岩土工程学报,2017,39(9):1724-1730.Wang L Q,Lu Zh G,Shao Sh J,et al.New nonlinear stress-strain model for loess and its comparative research[J].Chinese Journal of Geotechnical Engineering,2017,39(9):1724-1730.(in Chinese)
[14]赖远明,程红彬,高志华,等.冻结砂土的应力-应变关系及非线性莫尔强度准则[J].岩石力学与工程学报,2007,26(8):1612-1617.Lai Y M,Cheng H B,Gao Zh H,et al.Stress-strain relationship and nonlinear Mohr strength criterion of frozen sand clay[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1612-1617.(in Chinese)
[15]马巍,王大雁.中国冻土力学研究50a回顾与展望[J].岩土工程学报,2012,34(4):625-640.Ma W,Wang D Y.Studies on frozen soil mechanics in China in past 50years and their prospect[J].Chinese Journal of Geotechnical Engineering,2012,34(4):625-640.(in Chinese)
[16]土工试验方法标准:GB/T 50123—1999[S].北京:中国建筑工业出版社,1999.Standard for soil test methods:GB/T 50123—1999[S].Beijing:China Construction Industry Press,1999.(in Chinese)
[17]地基动力特性测试规范:GB/T 50269—1997[S].北京:中国建筑工业出版社,1997.Code for measurement method of dynamic properties of subsoil:GB/T 50123—1997[S].Beijing:China Construction Industry Press,1999.(in Chinese)
[18]沈珠江.应变软化材料的广义孔隙压力模型[J].岩土工程学报,1997,19(3):14-21.Shen Zh J.Generalized pore pressure model for strain softening materials[J].Chinese Journal of Geotechnical Engineering,1997,19(3):14-21.(in Chinese)
[19]Gitau A N,Gumbe L O,Biamah E K.Influence of soil water on stress-strain behaviour of a compacting soil in semi-arid Kenya[J].Soil&Tillage Research,2006,89(2):144-154.
[20]沈珠江.南京水利科学院土工研究报告汇编(1966~1978):第一分册[G].南京:南京水利科学院,1985:239-251.Shen Zh J.Compilation of geotechnical research report of Nanjing water conservancy academy(1966~1978):first volume[G].Nanjing:Nanjing Water Conservancy Academy,1985:239-251.(in Chinese)
[21]沈珠江.油罐地基固结变形的非线性分析[J].水利水运工程学报,1977(1):26-42.Shen Zh J.Nonlinear analysis of consolidation and deformation of oil tank foundation[J].Hydro-Science and Engineering,1977(1):26-42.(in Chinese)