橡胶黏土混合土动剪切模量及阻尼比试验研究
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摘要
为了研究橡胶黏土混合土动力特性,将橡胶掺入黏土,在4种围压下对5种不同配比橡胶黏土混合土进行室内动三轴试验以研究橡胶含量及围压对混合土动剪切模量和阻尼比的影响。结果表明,相同围压下,混合土动剪切模量较素土有很大降低,随着橡胶含量的增多而逐渐降低且降低速度由快变慢,动剪切模量与动应变关系曲线非线性特征减弱。阻尼比随着橡胶含量增加逐渐增加,且均较素土有显著提高。相同橡胶含量时,动剪切模量随着围压增大而增大,动剪切模量与动应变关系曲线线性特征增强,阻尼比随围压增大而减小。橡胶黏土动剪切模量与动应变关系可以用H-D模型表示,最大动剪切模量与围压之间的关系可以用线性函数表示,阻尼比与动应变关系可以用修正的陈国兴模型表示。结果证明,橡胶黏土混合土具备较好的隔震减震性能。
To illustrate the dynamic characteristics of rubber-clay mixture,laboratory dynamic triaxial tests under 4 different confining pressures were conducted on the rubber-clay mixtures with 5 different rubber contents.The effects of rubber content and confining pressure on shear modulus and damping ratio of rubber-clay mixture were studied.The results show that under the same confining pressure,the dynamic shear modulus of the mixtures is much lower than that of the pure clay.The dynamic shear modulus decreases with the increase of rubber content,and reducing rate gradually slows down.The nonlinear relationship between dynamic shear modulus and dynamic strain fades gradually.The damping ratio increases gradually with the increases of rubber content,and has a remarkable improvement compared with that of pure clay.With same rubber content,the dynamic shear modulus increases and the damping ratio decreases with the increase of confining pressure,and the linear behavior between dynamic shear modulus and dynamic strain strengthens.The relationship between dynamic shear modulus and dynamic strain can be expressed by H-D model.The relationship between maximum dynamic shear modulus and confining pressure can be expressed by a linear function.The relation between damping ratio and dynamic strain can be expressed by the modified Chen Guo-xing model.Test results confirm that earthquake resistant performance of rubber-clay mixture is good.
To illustrate the dynamic characteristics of rubber-clay mixture,laboratory dynamic triaxial tests under 4 different confining pressures were conducted on the rubber-clay mixtures with 5 different rubber contents.The effects of rubber content and confining pressure on shear modulus and damping ratio of rubber-clay mixture were studied.The results show that under the same confining pressure,the dynamic shear modulus of the mixtures is much lower than that of the pure clay.The dynamic shear modulus decreases with the increase of rubber content,and reducing rate gradually slows down.The nonlinear relationship between dynamic shear modulus and dynamic strain fades gradually.The damping ratio increases gradually with the increases of rubber content,and has a remarkable improvement compared with that of pure clay.With same rubber content,the dynamic shear modulus increases and the damping ratio decreases with the increase of confining pressure,and the linear behavior between dynamic shear modulus and dynamic strain strengthens.The relationship between dynamic shear modulus and dynamic strain can be expressed by H-D model.The relationship between maximum dynamic shear modulus and confining pressure can be expressed by a linear function.The relation between damping ratio and dynamic strain can be expressed by the modified Chen Guo-xing model.Test results confirm that earthquake resistant performance of rubber-clay mixture is good.
引文
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[21]李丽华,肖衡林,唐辉明,等.轮胎颗粒混合土动力特性参数影响规律试验研究[J].岩土力学,2014,35(2):359-365.Li L H,Xiao H L,Tang H M,et al.Dynamic properties variation of tire shred-soil mixtures[J].Rock and Soil Mechanics,2014,35(2):359-365.(in Chinese)
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[23]公路土工试验规程:JTG E40-2007[S].北京:人民交通出版社,2007.Test methods of soils for highway engineering:JTGE40-2007[S].Beijing:China Communications Press,2007.(in Chinese)
[24]Hardin B O,Drnevich V P.Shear modulus and damping of soils:measurement and parameter effects[J].Journal of Soil Mechanics and Foundation Division,1972,98(6):603-624.
[25]Martin P P,Seed H B.One-dimensional dynamic ground response analyses[J].Journal of the Geotechnical Engineering Division,1982,108(7):935-952.
[26]Roy H B.Dynamic properties of piedmont residual soils[J].Journal of Geotechnical Engineering,ASCE,1996,122(10):813-821.
[27]Zhang J F,Ronald D A,Juang C H.Nomalized shear modulus and material damping ratio relationships[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2005,131(4):453-464.
[28]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].防灾减灾工程学报,2004,24(2):1 403-1 410.Chen G X,Liu X Zh.Experimental study on dynamic shear modulus and damping ratio of recently deposited soils in Nanjing and its neighboring areas[J].Journal of Disaster Prevention and Mitigation Engineering,2004,24(2):1 403-1 410.(in Chinese)
[2]Bosscher P J,Edill T B,Kuraoke S.Design of highway embankments using tire chips[J].Journal of Geotechnical and Geoenviromental Engineering,ASCE,1997,123(4):297-304.
[3]Lee J H,Salgado R,Bernal A,et al.Shredded tire and rubber-sand as lightweight backfill[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,1999,125(2):132-141.
[4]Tiwari B,Ajmera B,Moubayed S,et al.Soil modification with shredded rubber tires[J].GeoCongress2012State of the Art and Practice in Geotechnical Engineering.ASCE,2012,225:3 701-3 708.
[5]Edincliler A,Cagatay A.Weak subgrade improvement with rubber fibreinclusions[J].Geosynthetics International,2013,20(1):39-46.
[6]Cetin H,Sylemez M.Soil-particle and pore orientations during drained and undrained shear of a cohesive sandy silt clay soil[J].Canadian Geotechnical Journal,2004,41(6):1 127-1 138.
[7]Cetin H,Fener M,Gunaydin O.Geotechnical properties of tire-cohesive clayey soil mixtures as a fill material[J].Engineering Geology,2006,88(1):110-120.
[8]Patil U,Valdes J R,Evans T M.Swell mitigation with granulated tire rubber[J].Journal of Materials in Civil Engineering,2010,23(5):721-727.
[9]Kim Y T,Kang H S.Engineering characteristics of rubber-added lightweight soil as a flowable backfill material[J].Journal of Materials in Civil Engineering,2011,23:1 289-1 294.
[10]孙树林,魏永耀,张鑫.废弃轮胎胶粉改良膨胀土的抗剪强度研究[J].岩石力学与工程学报,2009,28(增1):3 070-3 075.Sun Sh L,Wei Y Y,Zhang X.Research on shear strength of expansive soils reinforced with waste tire powders[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(Sup 1):3 070-3 075.(in Chinese)
[11]李朝晖,张虎元.废轮胎颗粒与黄土混合物压实性能研究[J].岩土力学,2010,31(12):3 715-3 720.Li Ch H,Zhang H Y.Compaction properties of granulated rubber and loess mixtures[J].Rock and Soil Mechanics,2010,31(12):3 715-3 720.(in Chinese)
[12]邹维列,谢鹏,马其天,等.废弃轮胎橡胶颗粒改性膨胀土的试验研究[J].四川大学学报(工程科学版),2011,43(3):44-48.Zou W L,Xie P,Ma Q T,et al.Experiment on characteristics of expansive soil modified with waste tire rubber particles[J].Journal of Sichuan University(Engineering Science Edition),2011,43(3):44-48.(in Chinese)
[13]付茹,李小青,Matthew R C.花岗岩风化土与废弃轮胎混合物力学特性研究[J].岩土力学,2016,37(9):2 593-2 598.Fu R,Li X Q,Matthew R C.Mechanical properties of completely decomposed granite soil and scrap tyre mixtures[J].Rock and Soil Mechanics,2016,37(9):2 593-2 598.(in Chinese)
[14]张涛,蔡国军,刘松玉,等.橡胶-砂颗粒混合物强度特性及微观机制试验研究[J].岩土工程学报,2017,39(6):1 082-1 088.Zhang T,Cai G J,Liu S Y,et al.Experimental study on strength characteristics and micromechanism of rubber-sand mixtures[J].Chinese Journal of Geotechnical Engineering,2017,39(6):1 082-1 088.(in Chinese)
[15]李珊珊,李大勇.废旧轮胎橡胶颗粒与黏土混合土的剪切特性[J].长江科学院院报,2017,34(7):99-105Li Sh Sh,Li D Y.Shearing properties of composite soil mixing clay with rubber particle of scrap tire[J].Journal of Yangtze River Scientific Research Institute,2017,34(7):99-105.(in Chinese)
[16]Feng Z Y,Sutter K G.Dynamic properties of granulated rubber/sand mixtures[J].Geotechnical Testing Journal,2000,23(3):338-344.
[17]Senetakis K,Anastasiadis A,Pitilakis K.Dynamic properties of dry sand/rubber(SRM)and gravel/rubber(GRM)mixtures in a wide range of shearing strain amplitudes[J].Soil Dynamics and Earthquake Engineering,2012,33(1):38-53.
[18]Anastasiadis A,Senetakis K,Pitilakis K.Small-strain shear modulus and damping ratio of sand-rubber and gravel-rubber mixtures[J].Geotechnical and Geological Engineering,2012,30(2):363-382.
[19]Nakhaei A,Marandi S M,Sanikermani S,et al.Dynamic properties of granular soils mixed with granulated rubber[J].Soil Dynamics and Earthquake Engineering,2012,43(12):124-132.
[20]尚守平,岁小溪,周志锦,等.橡胶颗粒-砂混合物动剪切模量的试验研究[J].岩土力学,2010,31(2):377-381.Shang Sh P,Sui X X,Zhou Zh J,et al.Study of dynamic shear modulus of granulated rubber-sand mixture[J].Rock and Soil Mechanics 2010,31(2):377-381.(in Chinese)
[21]李丽华,肖衡林,唐辉明,等.轮胎颗粒混合土动力特性参数影响规律试验研究[J].岩土力学,2014,35(2):359-365.Li L H,Xiao H L,Tang H M,et al.Dynamic properties variation of tire shred-soil mixtures[J].Rock and Soil Mechanics,2014,35(2):359-365.(in Chinese)
[22]刘方成,陈璐,王海东.橡胶砂动剪模量和阻尼比循环单剪试验研究[J].岩土力学,2016,37(7):1 903-1 913.Liu F Ch,Chen L,Wang H D.Evaluation of dynamic shear modulus and damping ratio of rubber-sand mixture based on cyclic simple shear tests[J].Rock and Soil Mechanics,2016,37(7):1 903-1 913.(in Chinese)
[23]公路土工试验规程:JTG E40-2007[S].北京:人民交通出版社,2007.Test methods of soils for highway engineering:JTGE40-2007[S].Beijing:China Communications Press,2007.(in Chinese)
[24]Hardin B O,Drnevich V P.Shear modulus and damping of soils:measurement and parameter effects[J].Journal of Soil Mechanics and Foundation Division,1972,98(6):603-624.
[25]Martin P P,Seed H B.One-dimensional dynamic ground response analyses[J].Journal of the Geotechnical Engineering Division,1982,108(7):935-952.
[26]Roy H B.Dynamic properties of piedmont residual soils[J].Journal of Geotechnical Engineering,ASCE,1996,122(10):813-821.
[27]Zhang J F,Ronald D A,Juang C H.Nomalized shear modulus and material damping ratio relationships[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2005,131(4):453-464.
[28]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].防灾减灾工程学报,2004,24(2):1 403-1 410.Chen G X,Liu X Zh.Experimental study on dynamic shear modulus and damping ratio of recently deposited soils in Nanjing and its neighboring areas[J].Journal of Disaster Prevention and Mitigation Engineering,2004,24(2):1 403-1 410.(in Chinese)