制备TJ-1模拟月壤空心圆柱试样的新方法
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摘要
针对TJ-1模拟月壤颗粒级配跨度大、粒径>2 mm的颗粒含量多,采用常规方法制备空心圆柱试样容易出现粗细颗粒分离、试样整体不均匀的特点,提出改良型制备方法.首先采用分层欠压法与冰冻法相结合制备出孔隙比e=1.0的实心圆柱试样,并对实心样的均匀性进行评价,得到分层制备相同孔隙比的TJ-1模拟月壤均匀试样时每层试样的高度;而后采用插捣砂雨法制备出相对均匀的空心圆柱试样.改良型方法制备出的TJ-1模拟月壤空心圆柱试样均匀性良好,是后续TJ-1模拟月壤空心圆柱试验顺利进行的重要保证.
As the conventional preparation method of making hollow cylinder specimen is not suitable for TJ-1 lunar soil simulant due to its broad span of size distribution and including a mass of particles whose diameters are larger than 2 mm,one kind of adjusting preparation method was brought forward.Firstly,the solid cylinder specimens with a void ratio e=1.0 were prepared by using the multi-layer with undercompaction method(UCM).And then the uniformity of the specimens was evaluated with the application of freezing method for getting height of each layer of the homogeneous specimen.Finally,the isotropic hollow cylinder specimen was prepared by the dry deposition and tamping method.Good results were achieved by using the adjusting method of making uniform hollow cylinder specimen,and simultaneously it provides an important guarantee for the following hollow cylinder experiments of TJ-1 lunar soil simulant.
As the conventional preparation method of making hollow cylinder specimen is not suitable for TJ-1 lunar soil simulant due to its broad span of size distribution and including a mass of particles whose diameters are larger than 2 mm,one kind of adjusting preparation method was brought forward.Firstly,the solid cylinder specimens with a void ratio e=1.0 were prepared by using the multi-layer with undercompaction method(UCM).And then the uniformity of the specimens was evaluated with the application of freezing method for getting height of each layer of the homogeneous specimen.Finally,the isotropic hollow cylinder specimen was prepared by the dry deposition and tamping method.Good results were achieved by using the adjusting method of making uniform hollow cylinder specimen,and simultaneously it provides an important guarantee for the following hollow cylinder experiments of TJ-1 lunar soil simulant.
引文
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[3]Xu Chengshun.Experimental Study on Shear Behavior andConstitutive Model of Saturated Sands under Complex ShearLoading[D].Dalian:Dalian University of Technology,2006.[许成顺.复杂应力条件下饱和砂土剪切特性及本构模型的试验研究[D].大连:大连理工大学,2006年.]
[4]Zhang Quanfang,Zhao Yu,Huang Bo,et al.Development ofa compacting instrument for reconstituted samples in hollowcylinder apparatus[J].Research and Exploration in Laborato-ry,2008,27(5):42-44.[张泉芳,赵宇,黄博,等.空心圆柱扭剪仪重塑样击实器的研制[J].实验室研究与探索,2008,27(5):42-44.]
[5]Jiang Mingjing,Li Liqing,Sun Yugang.TJ-1 lunar soil simu-lant[J].Chinese Journal of Geotechnical Engineering,2011,33(2):209-214.[蒋明镜,李立青,孙渝刚.TJ-1模拟月壤的研制[J].岩土工程学报,2011,33(2):209-214.]
[6]Jiang M J,Li L Q,Sun Y G.Properties of TJ-1 lunar soilsimulant[J].Journal of Aerospace Engineering,2011.(Ac-cepted).
[7]Jiang Mingjing,Sun Yugang.Analysis and Evaluation of TJ-1Lunar Soil Simulant on an Impact Test[R].Shanghai:TongjiUniversity,2009.[蒋明镜,孙渝刚.模拟月壤冲击试验数据分析及评价报告[R].上海:同济大学,2009年.]
[8]Liu Yanhua.On Yielding Characteristics And Principal StressRotation In Natural Soft Clay[D].Shanghai:Tongji Universi-ty,2010.[柳艳华.天然软黏土屈服特性及主应力轴旋转效应研究[D].上海:同济大学,2010.]
[9]Chaudharg S K,Kawano J,Hashimoto S,et al.Effects of in-itial fabric and shearing direction on cyclic deformation charac-teristics of sands[J].Soils and Foundations,2002,42(1):147-157.
[10]Zhang Kunyong,Yin Zongze,Mei Guoxiong.Difference andconnection of two kinds of anisotropy of soils[J].ChineseJournal of Rock Mechanics and Engineering.2005,24(9):1599-1604(in Chinese).[张坤勇,殷宗泽,梅国雄.土体两种各向异性的区别与联系[J].岩石力学与工程学报.2005,24(9):1599-1604.]
[11]Jiang Mingjing,Leroueil S,Konrad J M.An efficient tech-nique for generating homogeneous specimens for DEM studies[J].Computers and Geotechanics,2003,30(5):579-597.
[12]Kiekbusch M,Schuppener B.Membrane penetration and itseffect on pore pressures[J].Journal of the Geotechnical Engi-neering Division,ASCE,1977,103(11):1267-1279.
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