海陆交互相黏性土蠕变试验与经验模型研究
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摘要
海陆交互相沉积土是在复杂的沉积环境下形成的,其力学性质与其他沉积土有所区别.针对大连海陆交互相黏性土原状样,采用三轴排水蠕变试验对黏性土的蠕变特性进行了研究,分析了轴向应变、体应变、轴向应变速率与蠕变时间、偏应力间的关系.基于蠕变试验结果,耦合Mesri模型与三次多项式,建立了可以描述土体衰减蠕变与加速蠕变过程的经验模型.结果表明,该地区土体具有典型的非线性蠕变特性,随着偏应力的增加,非线性蠕变特性愈加明显.在低偏应力作用下,蠕变过程表现出衰减蠕变与剪缩特性;在破坏偏应力下表现出加速蠕变与剪缩、剪胀交替特性.轴向应变速率随着蠕变时间的增加而减小,随着偏应力的增大而增大,而偏应力对m值(曲线斜率)的影响较小.试验结果与模型计算结果吻合较好,表明新建模型适用于描述该地区海陆交互相黏性土的蠕变特性.
The marine-terrestrial interactive deposit soils are formed in the complex depositional environment,its mechanical properties are different from the other deposits.The creep behaviors of Dalian marine-terrestrial interactive clayey soils are studied according to drained triaxial creep tests,and the relations between axial strain,volume strain,axial strain rate and creep time,deviatoric stress are analyzed.Based on the creep test results,the empirical model is established to describe the attenuation and acceleration creep process,which coupling Mesri model and cubic polynomial model.The results show that,Dalian clayey soils have the typical nonlinear creep behavior,and the nonlinearity is more obvious with the increasing of deviatoric stress.Under low deviatoric stress,the creep processes show the characteristic of attenuation creep and shear shrinkage.However,it shows the characteristic of acceleration creep,shear shrinkage and shear dilatancy under damage deviatoric stress.The axial strain rate decreases with the increasing of creep time,and increases with the deviatoric stress increasing,while the deviatoric stress has little effect on the mvalues(slope).The test results agree well with calculation results,which shows that the empirical model can describe the creep behaviors of marine-terrestrial interactive clayey soil in this area.
The marine-terrestrial interactive deposit soils are formed in the complex depositional environment,its mechanical properties are different from the other deposits.The creep behaviors of Dalian marine-terrestrial interactive clayey soils are studied according to drained triaxial creep tests,and the relations between axial strain,volume strain,axial strain rate and creep time,deviatoric stress are analyzed.Based on the creep test results,the empirical model is established to describe the attenuation and acceleration creep process,which coupling Mesri model and cubic polynomial model.The results show that,Dalian clayey soils have the typical nonlinear creep behavior,and the nonlinearity is more obvious with the increasing of deviatoric stress.Under low deviatoric stress,the creep processes show the characteristic of attenuation creep and shear shrinkage.However,it shows the characteristic of acceleration creep,shear shrinkage and shear dilatancy under damage deviatoric stress.The axial strain rate decreases with the increasing of creep time,and increases with the deviatoric stress increasing,while the deviatoric stress has little effect on the mvalues(slope).The test results agree well with calculation results,which shows that the empirical model can describe the creep behaviors of marine-terrestrial interactive clayey soil in this area.
引文
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[18]JIANG Mingjing,LIU Jingde,YIN Zhenyu.Consolidation and creep behaviors of two typical marine clays in China[J].China Ocean Engineering,2014,28(5):629-644.
[19]SUN Mingqian,WANG Qing,RUAN Yunkai,et al.Settlement prediction of soft soil foundation based on consolidation and creep theory[J].International Journal of Simulation:System,Science and Technology,2015,16(2A):2.1-2.8.
[20]SHABAN A M,COSENTINO P J.Modeling longterm deformations of unbound pavement materials using the miniaturized preburemeter creep data[J].Geotechnical Testing Journal,2016,39(5):813-826.
[2]陈晓平.海陆交互相沉积软土固结效应[J].岩土工程学报,2011,33(4):520-528.CHEN Xiaoping.Consolidation effect of soft soil in interactive marine and terrestrial deposit[J].Chinese Journal of Geotechnical Engineering,2011,33(4):520-528.(in Chinese)
[3]柳艳华,石名磊.海陆交互相下黏性土性状辨析及评价研究[J].岩土力学,2008,29(2):523-528.LIU Yanhua,SHI Minglei.Evaluation research and distinguishing of cohesive soil properties in the interactive marine&terrestrial deposit[J].Rock and Soil Mechanics,2008,29(2):523-528.(in Chinese)
[4]张宏,柳艳华,石名磊,等.海陆交互相下粘性土的性状研究[J].岩土力学,2005,26(9):1491-1494.ZHANG Hong,LIU Yanhua,SHI Minglei,et al.Research of characteristics of the sedimentary clay in the alternate marine and terrigenous environment[J].Rock and Soil Mechanics,2005,26(9):1491-1494.(in Chinese)
[5]刘志彬,刘松玉,经绯,等.长江口海陆交互相沉积土复合地基孔压响应特性[J].岩土工程学报,2015,37(z2):91-95.LIU Zhibin,LIU Songyu,JING Fei,et al.Pore pressure response of composite foundation in interactive marine and terrestrial deposit of Yangtze River estuary[J].Chinese Journal of Geotechnical Engineering,2015,37(z2):91-95.(in Chinese)
[6]拓勇飞,孔令伟,郭爱国,等.湛江地区结构性软土的赋存规律及其工程特性[J].岩土力学,2004,25(12):1879-1884.TUO Yongfei,KONG Lingwei,GUO Aiguo,et al.Occurrence and engineering properties of structural soft clay in Zhanjiang area[J].Rock and Soil Mechanics,2004,25(12):1879-1884.(in Chinese)
[7]石名磊,张波,洪振舜.天然沉积中间土的力学特性研究[J].岩土力学,2005,26(11):1753-1756.SHI Minglei,ZHANG Bo,HONG Zhenshun.Mechanical properties of natural sedimentary intermediate soils[J].Rock and Soil Mechanics,2005,26(11):1753-1756.(in Chinese)
[8]卢萍珍,曾静,盛谦.软黏土蠕变试验及其经验模型研究[J].岩土力学,2008,29(4):1041-1044,1052.LU Pingzhen,ZENG Jing,SHENG Qian.Creep tests on soft clay and its empirical models[J].Rock and Soil Mechanics,2008,29(4):1041-1044,1052.(in Chinese)
[9]雷华阳,刘景锦,贾亚芳,等.滨海软黏土蠕变特性的三轴试验[J].天津大学学报(自然科学与工程技术版),2013,46(5):387-392.LEI Huayang,LIU Jingjin,JIA Yafang,et al.Triaxial test on creep properties of coastal soft clay[J].Journal of Tianjin University(Science and Technology),2013,46(5):387-392.(in Chinese)
[10]孔令伟,张先伟,郭爱国,等.湛江强结构性黏土的三轴排水蠕变特征[J].岩石力学与工程学报,2011,30(2):365-372.KONG Lingwei,ZHANG Xianwei,GUO Aiguo,et al.Creep behavior of Zhanjiang strong structured clay by drained triaxial test[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(2):365-372.(in Chinese)
[11]刘业科,邓志斌,曹平,等.软黏土的三轴蠕变试验与修正的Singh-Mitchell蠕变模型[J].中南大学学报(自然科学版),2012,43(4):1440-1446.LIU Yeke,DENG Zhibin,CAO Ping,et al.Triaxial creep test and modified Singh-Mitchell creep model of soft clay[J].Journal of Central South University(Science and Technology),2012,43(4):1440-1446.(in Chinese)
[12]LAI X L,WANG S M,YE W M,et al.Experimental investigation on the creep behavior of an unsaturated clay[J].Canadian Geotechnical Journal,2014,51(6):621-628.
[13]WANG Lizhong,YIN Zhenyu.Stress dilatancy of natural soft clay under an undrained creep condition[J].International Journal of Geomechanics,2015,15(5):1-5.
[14]闫澍旺,刘克瑾,李伟,等.天津滨海新区软黏土的蠕变特性及无屈服面模型研究[J].岩土力学,2010,31(5):1431-1436,1444.YAN Shuwang,LIU Kejin,LI Wei,et al.Study of creep properties of soft clay in Tianjin Binhai New Area and no-yield-surface constitutive model[J].Rock and Soil Mechanics,2010,31(5):1431-1436,1444.(in Chinese)
[15]SUN Mingqian,WANG Qing,NIU Cencen,et al.Research on the one-dimensional rheological consolidation theory that considers secondary consolidation effect[J].Journal of Computational and Theoretical Nanoscience,2016,13(2):1136-1146.
[16]ZHU Yanbo,YU Hongming.An improved Mesri creep model for unsaturated weak intercalated soils[J].Journal of Central South University,2014,21(12):4677-4681.
[17]FENG Shengyang,WEI Limin,HE Chongyang,et al.A computational method for post-construction settlement of high-speed railway bridge pile foundation considering soil creep effect[J].Journal of Central South University,2014,21(7):2921-2927.
[18]JIANG Mingjing,LIU Jingde,YIN Zhenyu.Consolidation and creep behaviors of two typical marine clays in China[J].China Ocean Engineering,2014,28(5):629-644.
[19]SUN Mingqian,WANG Qing,RUAN Yunkai,et al.Settlement prediction of soft soil foundation based on consolidation and creep theory[J].International Journal of Simulation:System,Science and Technology,2015,16(2A):2.1-2.8.
[20]SHABAN A M,COSENTINO P J.Modeling longterm deformations of unbound pavement materials using the miniaturized preburemeter creep data[J].Geotechnical Testing Journal,2016,39(5):813-826.