循环荷载对饱和黄土动剪模量的影响研究
摘要
利用装有压电陶瓷弯曲元的双向振动三轴仪对饱和黄土进行了循环荷载试验,并根据静力固结条件下黄土的动剪模量发展规律建立了基于哈定方程的拟合曲线;将循环荷载作用下的动剪模量与静力固结下的动剪模量进行了对比研究,并根据轴向应变的发展规律,确定了以上2种条件下动剪模量产生差异的原因:试样结构性破坏,土颗粒重排列,土体具有很高的敏感性。对于振动过程中的暂停对试验的影响进行了研究,认为由于暂停时间很短,可以忽略这种影响。在振动结束后,对试样在原压力下重新进行固结,结果表明,固结完成后,试样的动剪模量增大,且增大幅度随着密度的增加而变小。
Cyclic loading test of loess was conducted in use of bidirectional vibration's triaxial test device with piezoelectric ceramic bending element.According to development rule of dynamic shear modulus of loess under static consolidation condition,the Hardin and Richart equation-based fitting curve was established.Comparison of dynamic shear modulus under cyclic loading and static consolidation condition was carried out and in the basis of development rule of axial strain,the reason of difference between both was determined,i.e.sample's structural damage,soil particle's rearrangement and the high sensitivity of the soil body.The influence of pause process on test result was researched.It can be known that because the pause time is short,its influence can be ignored.After the test is over,the sample was consolidated under original pressure.The results show that after finish of consolidation,the dynamic shear modulus of the sample increases,but the increment decreases with increase of density.
Cyclic loading test of loess was conducted in use of bidirectional vibration's triaxial test device with piezoelectric ceramic bending element.According to development rule of dynamic shear modulus of loess under static consolidation condition,the Hardin and Richart equation-based fitting curve was established.Comparison of dynamic shear modulus under cyclic loading and static consolidation condition was carried out and in the basis of development rule of axial strain,the reason of difference between both was determined,i.e.sample's structural damage,soil particle's rearrangement and the high sensitivity of the soil body.The influence of pause process on test result was researched.It can be known that because the pause time is short,its influence can be ignored.After the test is over,the sample was consolidated under original pressure.The results show that after finish of consolidation,the dynamic shear modulus of the sample increases,but the increment decreases with increase of density.
引文
[1]王兰民,王峻,李兰.随机地震荷载作用下黄土液化的试验预测[C]∥第四届全国土动力学学术会议论文集.杭州:浙江大学出版社,1994.134-137.Wang L M,Wang J,Li L.Tests on prediction ofloess liquefaction during random seismic loading[C]∥Fourth National Conference on Soil DynamicsProceedings.Hangzhou:Zhejiang University Press,1994.134-137.
[2]蔡辉腾,李英民,欧秉松.福州地区典型土动剪切模量与阻尼比的试验研究[J].岩土力学,2010,31(2):361-365.Cai H T,Li Y M,Ou B S.Testing study of dynamicshear modulus and damping ratio of typical soils inFuzhou area[J].Rock and Soil Mechanics,2010,31(2):361-365.
[3]巫志辉,谢定义,方彦.洛川黄土动变形强度特性的研究[J].水利学报,1994,(12):67-71.Wu Zh H,Xie D Y,Fang Y.The research ondynamic deformation strength of Luochuan loess[J].Journal of Hydraulic Engineering,1994,(12):67-71.
[4]黄博,陈云敏,殷建华,等.控制试样初始剪切模量的动三轴液化试验[J].岩土工程学报,2000,22(6):682-685.Huang B,Chen Y M,Yin J H,et al.Cyclic triaxialtests with controlled elastic shear modulus ofspecimen[J].Chinese Journal of GeotechnicalEngineering,2000,22(6):682-685.
[5]黄博,施明雄,陈云敏,等.循环振动对饱和粉土初始动剪模量的影响[J].岩土工程学报,2009,31(5):764-771.Huang B,Shi M X,Chen Y M,et al.Effects ofseismic vibration on small strain shear modulus ofsaturated silt[J].Chinese Journal of GeotechnicalEngineering,2009,31(5):764-771.
[6]Zhou Y G,Chen Y M.Influence of seismic cyclicloading history on small strain shear modulus ofsaturated sands[J].Soil Dynamics and EarthquakeEngineering,2005,25(5):341-353.
[7]Martin P P,Seed H B.Simplified procedure foreffective stress analysis of ground response[J].Journal of the Geotechnical Engineering Division,ASCE,1979,105(6):739-758.
[8]Guo T Q,Prakash S.Liquefaction of silts and silt-claymixtures[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,1999,125(8):706-710.
[9]曾长女.细粒含量对粉土液化及液化后影响的试验研究[D].南京:河海大学岩土工程研究所,2006.Zeng Zh N.Laboratory test study on the influence ofpercent fines on silt liquefaction and post-liquefaction[D].Nanjing:Geotechnical Research Institute ofHohai University,2006.
[10]孙海妹.兰州黄土液化特性的试验研究[D].兰州:中国地震局兰州地震研究所,2009.Sun H M.The experimental study on liquefactioncharacteristics of loess in lanzhou[D].Lanzhou:Lanzhou Earthquake Institute of China EarthquakeAdministration,2009.
[11]孙海妹,王兰民,王平,等.饱和兰州黄土液化过程中孔压和应变发展的试验研究[J].岩土力学,2010,31(11):3464-3468.Sun H M,Wang L M,Wang P,et al.Experimentalstudy of development of strain and pore waterpressure during liquefaction of saturated Lanzhouloess[J].Rock and Soil Mechanics,2010,31(11):3464-3468.
[12]Zhou Y G,Chen Y M.Laboratory investigation onassessing liquefaction resistance of sandy soils byshear wave velocity[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,2007,133(8):959-972.
[13]Chen Y M,Ke H,Chen R P.Correlation of shearwave velocity with liquefaction resistance based onlaboratory tests[J].Soil Dynamics and EarthquakeEngineering,2005,25(6):461-469.
[2]蔡辉腾,李英民,欧秉松.福州地区典型土动剪切模量与阻尼比的试验研究[J].岩土力学,2010,31(2):361-365.Cai H T,Li Y M,Ou B S.Testing study of dynamicshear modulus and damping ratio of typical soils inFuzhou area[J].Rock and Soil Mechanics,2010,31(2):361-365.
[3]巫志辉,谢定义,方彦.洛川黄土动变形强度特性的研究[J].水利学报,1994,(12):67-71.Wu Zh H,Xie D Y,Fang Y.The research ondynamic deformation strength of Luochuan loess[J].Journal of Hydraulic Engineering,1994,(12):67-71.
[4]黄博,陈云敏,殷建华,等.控制试样初始剪切模量的动三轴液化试验[J].岩土工程学报,2000,22(6):682-685.Huang B,Chen Y M,Yin J H,et al.Cyclic triaxialtests with controlled elastic shear modulus ofspecimen[J].Chinese Journal of GeotechnicalEngineering,2000,22(6):682-685.
[5]黄博,施明雄,陈云敏,等.循环振动对饱和粉土初始动剪模量的影响[J].岩土工程学报,2009,31(5):764-771.Huang B,Shi M X,Chen Y M,et al.Effects ofseismic vibration on small strain shear modulus ofsaturated silt[J].Chinese Journal of GeotechnicalEngineering,2009,31(5):764-771.
[6]Zhou Y G,Chen Y M.Influence of seismic cyclicloading history on small strain shear modulus ofsaturated sands[J].Soil Dynamics and EarthquakeEngineering,2005,25(5):341-353.
[7]Martin P P,Seed H B.Simplified procedure foreffective stress analysis of ground response[J].Journal of the Geotechnical Engineering Division,ASCE,1979,105(6):739-758.
[8]Guo T Q,Prakash S.Liquefaction of silts and silt-claymixtures[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,1999,125(8):706-710.
[9]曾长女.细粒含量对粉土液化及液化后影响的试验研究[D].南京:河海大学岩土工程研究所,2006.Zeng Zh N.Laboratory test study on the influence ofpercent fines on silt liquefaction and post-liquefaction[D].Nanjing:Geotechnical Research Institute ofHohai University,2006.
[10]孙海妹.兰州黄土液化特性的试验研究[D].兰州:中国地震局兰州地震研究所,2009.Sun H M.The experimental study on liquefactioncharacteristics of loess in lanzhou[D].Lanzhou:Lanzhou Earthquake Institute of China EarthquakeAdministration,2009.
[11]孙海妹,王兰民,王平,等.饱和兰州黄土液化过程中孔压和应变发展的试验研究[J].岩土力学,2010,31(11):3464-3468.Sun H M,Wang L M,Wang P,et al.Experimentalstudy of development of strain and pore waterpressure during liquefaction of saturated Lanzhouloess[J].Rock and Soil Mechanics,2010,31(11):3464-3468.
[12]Zhou Y G,Chen Y M.Laboratory investigation onassessing liquefaction resistance of sandy soils byshear wave velocity[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,2007,133(8):959-972.
[13]Chen Y M,Ke H,Chen R P.Correlation of shearwave velocity with liquefaction resistance based onlaboratory tests[J].Soil Dynamics and EarthquakeEngineering,2005,25(6):461-469.
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