发泡颗粒混合轻量土三轴应力-应变-孔压特性试验
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摘要
通过三轴试验对淤泥发泡颗粒混合轻量土进行研究,揭示了不同配比、围压对轻量土应力-应变-孔压特性的影响本质,以及变形模量的变化规律;并结合前人成果,对应力-应变关系进行了模型概化与曲线拟合;基于发泡颗粒混合轻量土的物质结构组成特性,提出了一个反映其物理力学性质的广义本构模型。分析结果表明:配比决定试样的胶结结构强度,围压决定试样的应力状态,围压大于胶结结构强度时,试样剪缩,应变硬化,孔压不断上升,反之,试样剪胀,应变软化,孔压上升后下降,甚至出现负值;变形模量随水泥掺入比的增大而线性增大,随EPS颗粒掺入比的增大而非线性减小,与围压关系不大;概化模型有应变硬化型、应变软化型及理想弹塑型3种;Ducan-Chang双曲线模型与Prevost软化模型的拟合效果较好,但软化模型很难对应变大于15%的曲线进行拟合。
Influence essence of pore water pressure-stress-strain characteristics of foamed particle light weight soil with different mixed ratios under different confining pressures was revealed by triaxial compression test.Combining precursors' research production,stress-strain relation models were summarized and test curves were fitted.Based on matter structure composition property of foamed particle light weight soil,a generalized constitutive model which can reflect its physical mechanical characteristics was brought forward.The analytical results show that mixed ratio decides cementation structure strength of soil sample;confining pressure decides stress state.When confining pressure is bigger than cementation structure strength,the soil sample becomes shear contraction,stress-strain relation is strain hardening,pore water pressure increases slowly;on the contrary,the soil sample becomes shear dilatancy,stress-strain relation is strain softening,pore water pressure increases firstly and then decreases,even reaches negative.There are three types of constitutive models: strain hardening,strain softening,and ideal elastic-plastic type.Fitting effects of Duncan-Chang hyperbolic model and Prevost softening model are better,but the curves whose strain is more than 15% can't be fitted by Prevost softening model very well.
Influence essence of pore water pressure-stress-strain characteristics of foamed particle light weight soil with different mixed ratios under different confining pressures was revealed by triaxial compression test.Combining precursors' research production,stress-strain relation models were summarized and test curves were fitted.Based on matter structure composition property of foamed particle light weight soil,a generalized constitutive model which can reflect its physical mechanical characteristics was brought forward.The analytical results show that mixed ratio decides cementation structure strength of soil sample;confining pressure decides stress state.When confining pressure is bigger than cementation structure strength,the soil sample becomes shear contraction,stress-strain relation is strain hardening,pore water pressure increases slowly;on the contrary,the soil sample becomes shear dilatancy,stress-strain relation is strain softening,pore water pressure increases firstly and then decreases,even reaches negative.There are three types of constitutive models: strain hardening,strain softening,and ideal elastic-plastic type.Fitting effects of Duncan-Chang hyperbolic model and Prevost softening model are better,but the curves whose strain is more than 15% can't be fitted by Prevost softening model very well.
引文
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[2]袁宝来,李兵.聚苯乙烯防止道路冻胀的应用研究[J].辽宁省交通高等专科学校学报,2002,4(2):1-4.YUAN Bao-lai,LI Bing.An Application Research onPreventing Frozen Swell with Polystyrene Heat Insu-lator[J].Journal of Liaoning Provincial College ofCommunications,2002,4(2):1-4.
[3]姬凤玲.淤泥泡沫塑料颗粒轻质混合土力学特性研究[D].南京:河海大学,2005.JI Feng-ling.Study on Mechanical Properties ofLight-weight Bead-treated Soil Made from Silt[D].Nanjing:Hohai University,2005.
[4]董金梅.聚苯乙烯轻质混合土工程特性的试验研究[D].南京:河海大学,2005.DONG Jin-mei.Study on the Engineering Characteris-tic of Light Heterogeneous Soil Mixed ExpandedPolystyrene[D].Nanjing:Hohai University,2005.
[5]MIKI H,CHIDA S,NISHIDA K,et al.ConstructionExample of Foamed Reinforced Soil[C]//AACJCES.3rd Part,Meeting Summary of the 47th Annual Aca-demic Conference for Japan Civil Engineering Society.Tokyo:AACJCES,1992:1080-1081.
[6]YAJIMA S,MARUO S,KOGAWA M.ShearStrength Characteristics of Foam Lightweight Soil[J].Collected Papers of Japan Civil Engineering Soci-ety,1994,14(9):197-205.
[7]NAGASE K,KOBAYASHI H.Development of aLightweight Soil with Styrofoam[J].Soil and Founda-tions,2000,48(6):13-15.
[8]TSUCHIDA K,TOUGI H.Application of Light-weight Soil Mixture Made from Clay and ConstructionSoil in Coastal Engineering[J].Collected Papers ofJapan Civil Engineering Society,2000,20(3):13-23.
[9]YAMADA S,NAGASAKA Y.Foamed Particle Light-weight Soil with Sand[J].Soil and Foundations,1989,37(2):25-30.
[10]MORI N,KISHIDA S,NISHIDA N,et al.PenetrationProperties of Foamed Mixed Lightweight Soil[C]//GERC.The 28th Geotechnical Engineering ResearchConference.Tokyo:GERC,1993:2653-2654.
[11]NAGASAKA Y,YAMADA S.Foamed Particle Light-weight Soil with Foamed Beads[J].Soil and Founda-tions,1994,42(10):25-30.
[12]马时冬.聚苯乙烯泡沫塑料轻质填土(SLS)的特性[J].岩土力学,2001,22(3):245-248.MA Shi-dong.The Properties of Stabilized Light Soil(SLS)with Expanded Polystyrene[J].Rock and SoilMechanics,2001,22(3):245-248.
[13]刘汉龙,朱伟,高玉峰,等.一种轻质混合土及生产方法:中国,1373261[P].2002-10-09.LIU Han-long,ZHU Wei,GAO Yu-feng,et al.AKind of Light Mixed Soil and Production Methods:China,1373261[P].2002-10-09.
[14]汤俊.EPS颗粒混合轻质土物理力学特性的两相体模型研究[D].南京:河海大学,2006.TANG Jun.Physical-mechanical Properties Based onTwo-phase Model of EPS Beads-mixed LightweightSoil[D].Nanjing:Hohai University,2006.
[15]俞峰.低围压下砂土与EPS颗粒混合轻质土的动力变形特性研究[D].南京:河海大学,2006.YU Feng.Study on the Dynamic Deformation Charac-teristics of Lightweight Sand-EPS Beads Soil UnderLow Confine Pressure[D].Nanjing:Hohai Univer-sity,2006.
[16]朱云华.聚苯乙烯轻质混合土渗透特性试验研究[D].南京:河海大学,2006.ZHU Yun-hua.Study on the Permeable Characteristicof Lightweight Soil Mixed with Expanded Polystyrene[D].Nanjing:Hohai University,2006.
[17]黎冰.动荷载下粘土与EPS颗粒混合轻质土的变形和强度特性试验研究[D].南京:河海大学,2007.LI Bin.Experimental Study on the Deformation andStrength Properties of Lightweight Clay-EPS BeadsSoil Under Cyclic Loading[D].Nanjing:Hohai Uni-versity,2007.
[18]王庶懋.砂土与EPS颗粒混合的轻质土(LSES)动力特性的试验研究[D].南京:河海大学,2007.WANG Shu-mao.Experimental Study on DynamicCharacteristics of Lightweight Sand-EPS Beads Soil(LSES)[D].Nanjing:Hohai University,2007.
[19]侯天顺.淤泥发泡颗粒混合轻量土力学性质的试验研究[D].武汉:中国地质大学,2008.HOU Tian-shun.Experimental Study on MechanicalProperties of Foamed Particle Light Weight SoilMixed with Silt[D].Wuhan:China University of Geo-sciences,2008.
[20]肖礼经.泡沫水泥轻质土在公路建设中的应用与研究[D].长沙:湖南大学,2003.XIAO Li-jing.Foamed Cement Banking and Applica-tions in Highway Construction[D].Changsha:HunanUniversity,2003.
[21]杜时贵,罗战友.建筑用砂混合轻量土[M].北京:地震出版社,2007.DU Shi-gui,LUO Zhan-you.Light Weight Soil Mixedwith Building Sand[M].Beijing:Earthquake Press,2007.
[22]龚晓南,熊传祥,项可祥,等.粘土结构性对其力学性质的影响及形成原因分析[J].水利学报,2000(10):43-47.GONG Xiao-nan,XIONG Chuan-xiang,XIANG Ke-xiang,et al.The Formation of Clay Structure and ItsInfluence on Mechanical Characteristics of Clay[J].Journal of Hydraulic Engineering,2000(10):43-47.
[23]卢延浩,刘祖德.高等土力学[M].北京:机械工业出版社,2006.LU Yan-hao,LIU Zu-de.Advanced Soil Mechanics[M].Beijing:China Machine Press,2006.
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