振动频率对饱和黏性土动力特性的影响
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摘要
在回顾加荷频率对土样动力特性影响的研究基础上,采用某土石坝心墙防渗黏性土饱和试样,通过动三轴试验,研究了振动频率f对土样动力特性的影响。动强度试验结果表明:当f=0.1～4Hz时,动强度随f的升高而增大,但f继续升高后,动强度却有下降趋势。当f=0.1～1.0Hz时,频率愈高动孔压比愈大;当f=1.0～6.0Hz时,总的趋势为频率愈高,动孔压比愈小。表明频率较高时,动孔隙水压力来不及上升和扩散。较高频率f持续作用下,试样有吸水现象并伴随动孔压的下降。动模量阻尼试验结果是:f愈低,试样动变形开展愈充分;f愈高,动模量和阻尼比愈大。
To study the effect of vibration frequency on soil dynamic characteristics,firstly the related research outcomes are reviewed,then the dynamic triaxial tests which used core material of one rockfill dam were performed.The results of dynamic intensity tests show that with the increasing of vibration frequency f,dynamic intensity increases when f equals to 0.1-4 Hz;and with the increasing of f,dynamic porewater pressure ratio increases during f equals to 0.1-1.0 Hz while decreases during f equals to 1.0-6.0 Hz.Under the sustaining operation of higher frequency,there are phenomena of sample sopping up and dynamic porewater pressure declining.This means it hasn’t enough time for dynamic porewater pressure to climb and extend when f is much higher.And the results of dynamic modulus and damping ratio tests show that the lower the vibration frequency acting on the sample,the more sufficiently dynamic deformation could develop;both dynamic modulus Ed and damping ratio D increase with vibration frequency.
To study the effect of vibration frequency on soil dynamic characteristics,firstly the related research outcomes are reviewed,then the dynamic triaxial tests which used core material of one rockfill dam were performed.The results of dynamic intensity tests show that with the increasing of vibration frequency f,dynamic intensity increases when f equals to 0.1-4 Hz;and with the increasing of f,dynamic porewater pressure ratio increases during f equals to 0.1-1.0 Hz while decreases during f equals to 1.0-6.0 Hz.Under the sustaining operation of higher frequency,there are phenomena of sample sopping up and dynamic porewater pressure declining.This means it hasn’t enough time for dynamic porewater pressure to climb and extend when f is much higher.And the results of dynamic modulus and damping ratio tests show that the lower the vibration frequency acting on the sample,the more sufficiently dynamic deformation could develop;both dynamic modulus Ed and damping ratio D increase with vibration frequency.
引文
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[12]章克凌,陶振宇.饱和软黏土在循环荷载作用下的孔压预测[J].岩土力学,1994,15(3):9-17.ZHANG Ke-ling,TAO Zhen-yu.The prediction of porepressure of saturated clay under cyclic loading[J].Rock andsoil mechanics,1994,15(3):9-17.
[13]徐学燕,仲从利.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77-81.XU Xue-yan,ZHONG Cong-li.Research on dynamiccharacters of frozen soil and determination of itsparameters[J].Chinese Journal of Geotechnical Engin-eering,1998,20(5):77-81.
[14]陈存礼,胡再强.强夯地基黄土的动力特性参数及其与振动频率的关系[J].西安理工大学学报,1998,14(2):217-220.CHEN Cun-li,HU Zai-qiang.Dynamic characteristicsparameters and their relation to vibrofrequency ofdynamically-compacted foundation loess[J].Journal ofXi’an University of Technology,1998,14(2):217-220.
[15]王建荣,张振中,王峻,等.振动频率对原状黄土动本构关系的影响[J].西北地震学报,1999,21(3):310-314.WANG Jian-rong,ZHANG Zhen-zhong,WANG Jun,et al.Effect of vibration frequency on dynamic constitutiverelationship of loess[J].Northwestern SeismologicalJournal,1999,21(3):310-314.
[2]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[3]Bobby O Hardin,Vincent P Drnevich.Shear modulus anddamping in soils:measurement and parameter effects[J].Journal of the Soil Mechanics and FoundationsDivision,ASCE,1972,98(SM6):603-624.
[4]吴世明,徐攸在.土动力学现状与发展[J].岩土工程学报,1998,20(3):125-130.WU Shi-ming,XU You-zai.State–of–art and developmentof soil dynamics[J].Chinese Journal of GeotechnicalEngineering,1998,20(3):125-130.
[5]白冰,周健.周期荷载作用下黏性土变形及强度特性述评[J].岩土力学,1999,20(3):84-90.BAI Bing,ZHOU Jian.Some Problems on behaviour ofsaturated clay under cyclic loading[J].Rock and soilmechanics,1999,20(3):84-90.
[6]Yoshimi Y,Oh-oka H.Influence of degree of shear stressreversal on the liquefaction potential of saturated sand[J].Soils and Foundations,1975,15(3):27-40.
[7]Lee K L,Focht J A.Cyclic testing of soil for ocean waveloading problems[A].The 7th Annual Offshore TechnologyConference[C].Houston:Texas,1975.
[8]张建民,王稳祥.振动频率对饱和砂土动力特性的影响[J].岩土工程学报,1990,12(1):89-97.
[9]何昌荣.动模量和阻尼的动三轴试验研究[J].岩土工程学报,1997,19(2):39-48.HE Chang-rong.Dynamic triaxial test on modulus anddamping[J].Chinese Journal of Geotechnical Engineering,1997,19(2):39-48.
[10]许才军,周红波.不排水循环荷载作用下饱和软黏土的孔压增长模型[J].勘查科学技术,1998,(1):3-7.XU Cai-jun,ZHOU Hong-bo.Pore pressure increasemodel of saturated soft clay under undrained cyclic load.[J].Site Investigation Science and Technology,1998,(1)3-7.
[11]许才军,杜坚,周洪波.饱和软黏土在不排水循环荷载作用下孔隙水压力模型的建立[J].上海地质,1997,(3):16-21.XU Cai-jun,DU Jian,ZHOU Hong-bo.Establishment ofmodel of pore-water pressure of saturated soft clay undercyclic loading[J].Shanghai Geology,1997,(3):16-21.
[12]章克凌,陶振宇.饱和软黏土在循环荷载作用下的孔压预测[J].岩土力学,1994,15(3):9-17.ZHANG Ke-ling,TAO Zhen-yu.The prediction of porepressure of saturated clay under cyclic loading[J].Rock andsoil mechanics,1994,15(3):9-17.
[13]徐学燕,仲从利.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77-81.XU Xue-yan,ZHONG Cong-li.Research on dynamiccharacters of frozen soil and determination of itsparameters[J].Chinese Journal of Geotechnical Engin-eering,1998,20(5):77-81.
[14]陈存礼,胡再强.强夯地基黄土的动力特性参数及其与振动频率的关系[J].西安理工大学学报,1998,14(2):217-220.CHEN Cun-li,HU Zai-qiang.Dynamic characteristicsparameters and their relation to vibrofrequency ofdynamically-compacted foundation loess[J].Journal ofXi’an University of Technology,1998,14(2):217-220.
[15]王建荣,张振中,王峻,等.振动频率对原状黄土动本构关系的影响[J].西北地震学报,1999,21(3):310-314.WANG Jian-rong,ZHANG Zhen-zhong,WANG Jun,et al.Effect of vibration frequency on dynamic constitutiverelationship of loess[J].Northwestern SeismologicalJournal,1999,21(3):310-314.
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