饱和软土应力松弛试验及其本构方程
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摘要
利用k0连续加载固结仪对饱和软土进行了应力松弛试验,分析了饱和软土松弛阶段轴向应力以及松弛速率随时间的变化,从Merchant模型入手,利用变参数法建立了描述饱和软土应力松弛特性的非线性模型,并进行了模型计算和实测数据的对比分析。结果表明:饱和软土松弛阶段包括松弛加速阶段和松弛缓速阶段,随着时间的增大,松弛阶段的应力减少逐渐趋于稳定,产生一定的残余变形,且松弛应力与应力水平呈良好的线性关系;建立的变参数非线性应力松弛模型中含有的4个参数均与土的性质有关,可根据室内一维松弛试验反算得到;模型计算值与实测值拟合较好,为研究饱和软土松弛特性提供了有力的依据。
The stress relaxation test of the saturated soft soil was performed by using k0 continuous loading consolidation apparatus,the axial stress and relaxation rate of saturated soft soil changing with time in the relaxation phase were analysed.Based on the Merchant model,the nonlinear model for description of stress relaxation properties of saturated soft soil was established by using variation of parameter,and comparative analysis of the model calculated and test data was performed.The results show that(1) The relaxation stage of saturated soft clay includes relaxation acceleration stage and relaxation deceleration stage.With the time increasing,the stress decreases and gradually stabilizes in the relaxation phase,which producing certain residual deformation.The relationship between stress level and relaxation stress is linear;(2) the established variable parametric nonlinear model contains four parameters which related to the nature properties of soil,those parameters can be obtained by back computation based on 1D relaxation test;(3) the model reckoning fits well with the test data,indicating that it provides a strong basis for the study of properties of soft soil relaxation.
The stress relaxation test of the saturated soft soil was performed by using k0 continuous loading consolidation apparatus,the axial stress and relaxation rate of saturated soft soil changing with time in the relaxation phase were analysed.Based on the Merchant model,the nonlinear model for description of stress relaxation properties of saturated soft soil was established by using variation of parameter,and comparative analysis of the model calculated and test data was performed.The results show that(1) The relaxation stage of saturated soft clay includes relaxation acceleration stage and relaxation deceleration stage.With the time increasing,the stress decreases and gradually stabilizes in the relaxation phase,which producing certain residual deformation.The relationship between stress level and relaxation stress is linear;(2) the established variable parametric nonlinear model contains four parameters which related to the nature properties of soil,those parameters can be obtained by back computation based on 1D relaxation test;(3) the model reckoning fits well with the test data,indicating that it provides a strong basis for the study of properties of soft soil relaxation.
引文
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[2]杨春和,殷建华,DAEMEN J J K.盐岩应力松弛效应的研究[J].岩石力学与工程学报,1999,18(3):262?265.YANG Chunhe,YIN Jianhua,DAEMEN J J K.TheInvestigation of Stress Relaxation of Salt Rock[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(3):262-265.
[3]尹清杰,王世梅.饱和土松弛试验曲线模拟与试验验证[J].黑龙江水专学报,2006,33(2):24-26.YIN Qingjie,WANG Shimei.The Flabby Model ofSaturated Soil Establishment and Verification[J].Journalof Heilongjiang Hydraulic Engineering College,2006,33(2):24-26.
[4]熊军民,李作勤.黏土的蠕变?松弛耦合试验研究[J].岩土力学,1993,14(4):17-24.XIONG Junmin,LI Zouqin.Creep-relaxation CouplingTest of Clays[J].Rock and Soil Mechanics,1993,14(4):17-24.
[5]刘保健,张晓荣,程海涛.应变控制下压实黄土的动三轴试验研究[J].岩土力学,2007,28(6):1073-1076.LIU Baojian,ZHANG Xiaorong,CHENG Haitao.Studyon Compacted Loess under Strain Control at DynamicTriaxial Test[J].Rock and Soil Mechanics,2007,28(6):1073-1076.
[6]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,1996.QIAN Jiahuan,YIN Zongze.Geotechnical Principle andCalculation[M].Beijing:China Water Power Press,1996.
[7]耿兴福,李保雄,苗天德.马兰黄土剪应力松弛特性研究[J].西北地震学报,2010,32(1)36-41.GENG Xingfu,LI Baoxong,MIAO Tiande.Study on ShearStress Relaxation Properties of Malan Loess[J].Northwestern Seismological Journal,2010,32(1):36-41.
[8]孙钧.岩土材料流变及工程应用[M].北京:中国建筑工业出版社,1999.SUN Jun.Geological Materials Rheology and EngineeringApplication[M].Beijing:China Architecture&BuildingPress,1999.
[9]殷德顺,任俊娟,和成亮,等.一种新的岩土流变模型元件[J].岩石力学与工程学报,2007,26(9):1899-1903.YIN Deshun,REN Junjuan,HE Chengliang,et al.ANew Rheological Model Element for Geomaterials[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(9):1899-1903.
[10]熊良宵.深部层状岩土的流变特性试验及本构模型[D].上海:同济大学,2009.XONG Liangxiao.Deep Layered Geotechnical RheologicalProperties Test and Constitutive Model[D].Shanghai:Tongji University,2009.
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