不同增强体粉土复合土动力特性试验研究
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摘要
通过水泥土增强体粉土复合试样、灰土增强体粉土复合试样的动三轴试验,研究了粉土复合土的动力特性,分析了增强体刚度、置换率、围压、干密度、含水量的影响.试验结果表明水泥土增强体的设置对粉土动弹性模量Ed及最大动弹性模量Edmax的提高程度比灰土增强体大;两种复合试样的Ed及Edmax均随增强体置换率的增加而增大,随围压的增加而增大,随干密度的增加而增大,随含水量的增加而减小;增强体粉土复合试样在各种情况下的动弹模量归一化曲线依增强体置换率有序排列,试验点依次分布在各自对应的狡窄带宽内.文中同时给出两种增强体复合粉土在不同置换率下动弹模量归一化曲线的回归公式.
Based on the dynamic triaxial tests,the dynamic characteristics of silt composite samples with cement-soil reinforcement or lime-soil reinforcement are studied.Also the influences of reinforcement rigidity,replacement ratio,confining pressure,initial dry density and moisture content are analyzed.It is indicated that compared with lime-soil reinforcement,cement-soil reinforcement gives more improvement on the dynamic modulus Ed and the maximum dynamic elastic modulus Edmax of silt.Whether with cement-soil reinforcement or lime-soil reinforcement,the Ed and Edmax of silt composite sample increases as replacement ratio,confining pressure,initial dry density increase,but decreases as the moisture content increases.The Ed/Edmax-εd curve of silt composite sample distributes respectively within a narrow area in turn by replacement ratio.Lastly the regression formula of Ed /Edmax-εd curves are put forward based on experiment data.
Based on the dynamic triaxial tests,the dynamic characteristics of silt composite samples with cement-soil reinforcement or lime-soil reinforcement are studied.Also the influences of reinforcement rigidity,replacement ratio,confining pressure,initial dry density and moisture content are analyzed.It is indicated that compared with lime-soil reinforcement,cement-soil reinforcement gives more improvement on the dynamic modulus Ed and the maximum dynamic elastic modulus Edmax of silt.Whether with cement-soil reinforcement or lime-soil reinforcement,the Ed and Edmax of silt composite sample increases as replacement ratio,confining pressure,initial dry density increase,but decreases as the moisture content increases.The Ed/Edmax-εd curve of silt composite sample distributes respectively within a narrow area in turn by replacement ratio.Lastly the regression formula of Ed /Edmax-εd curves are put forward based on experiment data.
引文
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[3]Saxena S K.Dynamic moduli and damping rations of cemented sands at low strains[J].Canadian GeotechnicalJournal,1998,(25):353-368.
[4]Fahoum K,Aggour MS,Amini F.Dynamic prosperity of cohesive soils treated withli me[J].Journal of Geotech-nical and Geoenviromental Engineering,ASCE,1996,122(5):383-389.
[5]陈善民,王立忠,李挺,等.水泥土动力特性室内试验及复合地基抗震特性分析[J].浙江大学学报:工学版,2000,34(4):398-403.CHEN Shan-min,WANG Li-zhong,LI Ting,et al.Experi mental determination of dynamic properties of cement-treated soil and earthquake behavior of composite foundation[J].Journal of Zhejiang University(Engineering Sci-ence),2000,34(4):398-403.
[6]杨广庆.水泥改良土的动力特性试验研究[J].岩石力学与工程学报,2003,22(7):1156-1160.YANG Guang-qing.Study of dynamic performance of cement-i mproved soil[J].Chinese Journal of Rock Mechan-ics and Engineering,2003,22(7):1156-1160.
[7]胡昕,洪宝宁,闵紫超.从微结构分析温度对水泥土强度形成的影响[J].西安建筑科技大学学报:自然科学版,2007,39(5):628-634.HU Xin,HONG Bao-ning,MINZi-chao.Analysis on the effects of temperature fluctuation on the strengthforma-tion of cement-stabilized soils as viewed from microstructure[J].J.Xi′an Univ.of Arch.&Tech.(Natural Sci-ence Edition),2007,39(5):628-634.
[8]侯永峰,张航,周建,等.循环荷载作用下水泥复合土变形性状试验研究[J].岩土工程学报,2001,23(3):288-291.HOU Yong-feng,ZHANG Hang,ZHOU Jian,et al.Study on the strain of composite cement soil under cyclicloading[J].Chinese Journal of Geotechnical Engineering,2001,23(3):288-291.
[9]蔡袁强,梁旭,李坤.水泥土-土复合试样的动力特性[J].水利学报,2003,35(10):19-25.CAI Yuan-qiang,LIANG Xu,LI Kun.Dynamic characteristics of composite sample of cemented clay-clay[J].Shuili Xuebao,2003,35(10):19-25.
[10]曾国红,白晓红,张卫平,等.增强体复合土动弹性模量影响因素的研究[J].水利学报,2008,40(5):576-582.ZENG Guo-hong,BAI Xiao-hong,ZHANG Wei-ping,et al.Experi mental study onfactors influencing the dynam-ic elastic modulus of composite soil with different reinforcements[J].Shuili Xuebao,2008,40(5):576-582.
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