饱和粉质黏土动弹性模量影响因素分析及骨干曲线模型研究
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摘要
为了研究交通动荷载作用下地基土动弹模量的变化规律,利用室内动三轴试验系统对东南沿海地区饱和粉质黏土进行动三轴试验,研究围压、超固结比、孔隙比和应变幅值对动弹性模量变化规律的影响;采用经典Hardin-Drmevich等效线性模型,提出考虑超固结比、孔隙比影响的饱和粉质黏土动弹性模量修正公式。研究结果表明:在相同应变水平下,动弹性模量随着围压和超固结比增大而增大,随着孔隙比增大而减小;与经典Hardin-Drmevich公式相比,本文提出的动弹性模量修正公式对试验结果的拟合效果更好。
In order to study the change rules of the dynamic modulus of soil under traffic load, cyclic triaxial tests were performed on typical Southeast coast soft clay. The influences of confining pressure, consolidation ratio and void ratio on the dynamic elastic modulus were studied. Based on the classic Hardin-Drmevich equivalent linear model, a modified Hardin-Drmevich formula of dynamic elastic modulus considering both void ratio and consolidation ratio was developed.The results show that in the same strain level, dynamic elastic modulus increases with the increase of confining pressure and over-consolidation ratio. When the void ratio increases, the dynamic elastic modulus decreases. Compared with the conventional Hardin-Drmevich formula, the proposed formula is more suitable for the fitting of experimental result.
In order to study the change rules of the dynamic modulus of soil under traffic load, cyclic triaxial tests were performed on typical Southeast coast soft clay. The influences of confining pressure, consolidation ratio and void ratio on the dynamic elastic modulus were studied. Based on the classic Hardin-Drmevich equivalent linear model, a modified Hardin-Drmevich formula of dynamic elastic modulus considering both void ratio and consolidation ratio was developed.The results show that in the same strain level, dynamic elastic modulus increases with the increase of confining pressure and over-consolidation ratio. When the void ratio increases, the dynamic elastic modulus decreases. Compared with the conventional Hardin-Drmevich formula, the proposed formula is more suitable for the fitting of experimental result.
引文
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[11]郑刚,霍海峰,雷华阳,等.振动频率对饱和黏土动力特性的影响[J].天津大学学报(自然科学与工程技术版),2013,46(1):38-43.ZHEN Gang,HUO Haifeng,LEI Huayang,et al.Contrastive study on the dynamic characteristics of saturated clay in different vibration frequencies[J].Journal of Tianjin University(Science and Technology),2013,46(1):38-43.
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[13]廖红建,肖正华,刘健.动载下饱和重塑黄土的骨干曲线变化研究[J].岩土力学,2011,32(2):375-379.LIAO Hongjian,XIAO Zhenghua,LIU Jian.Study of variation of backbone curve of saturated remolded loess under dynamic loading[J].Rock&Soil Mechanics,2011,32(2):375-379.
[14]DARENDELI M B.Development of a new family of normalized modulus reduction and material damping curves[D].Austin,USA:University of Texas at Austin,2001:54-104.
[15]李校兵,谷川,蔡袁强.循环偏应力和循环围压耦合应力路径下饱和软黏土动模量衰减规律研究[J].岩土工程学报,2014,36(7):1218-1226.LI Xiaobing,GU Chuan,CAI Yuanqiang.Dynamic modulus degradation for soft saturated clay under coupling stress paths of cyclic deviatoric stress and cyclic confining pressure[J].Chinese Journal of Geotechnical Engineering,2014,36(7):1218-1226.
[16]刘家顺.高速铁路粉质粘土地基静、动力特性及沉降规律研究[D].北京:辽宁工程技术大学土木与交通学院,2015:66-71.LIU Jiashun.Research on the static and dynamic characteristic of silty clay and the settlement law of subgrade of high speed railway[D].Beijing:Liaoning Technical University.College of Civil and Transportation Engineering,2015:66-71.
[17]JTG E40-2007,公路土工试验规程[S].JTG E40-2007,Test methods of soils for highway engineering[S].
[18]TB 10102-2010,铁路工程土工试验规程[S].TB 10102-2010,Code for soil test of railway engineering[S].
[19]谢定义.土动力学[M].北京:高等教育出版社,2011:218-263.XIE Dingyi.Soils dynamics[M].Beijing:Higher Education Press,2011:218-263.
[20]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:design equations and curves[J].Geotechnical Special Publication,1972,98(118):667-692.
[2]张磊,高玉峰,王军.飞机荷载作用下温州机场超固结软粘土地基变形研究[J].三峡大学学报(自然科学版),2013,35(3):59-64.ZHANG Lei,GAO Yufeng,WANG Jun.Study of deformations of Wenzhou airport over-consolidated soft clay foundation under cyclic aircraft loading[J].Journal of China Three Gorges University,2013,35(3):59-64.
[3]刘升传,王连俊,丁桂伶.高速铁路CFG桩复合地基柔性载荷试验研究[J].工程地质学报,2008,16(6):813-819.LIU Shengchuan,WANG Lianjun,DING Guiling.Flexible or rigid loading tests for bearing capacity of CFG pile composite foundation along high-speed railway[J].Journal of Engineering Geology,2008,16(6):813-819.
[4]贾宁,陈仁朋,陈云敏,等.杭甬高速公路拓宽工程理论分析及监测[J].岩土工程学报,2004,26(6):755-760.JIA Ning,CHEN Renpeng,CHEN Yunmin,et al.Theoretical analysis and measurement for widening project of Hang-Yong expressway[J].Chinese Journal of Geotechnical Engineering,2004,26(6):755-760.
[5]叶耀东,朱合华,王如路.软土地铁运营隧道病害现状及成因分析[J].地下空间与工程学报,2007,3(1):157-160.YE Yaodong,ZHU Hehua,WANG Rulu.Analysis on the current status of metro operating tunnel damage in soft ground and its causes[J].Chinese Journal of Underground Space&Engineering,2007,3(1):157-160.
[6]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1972,98(SM6):603-624.
[7]汪明元,单治钢,王亚军,等.应变控制下舟山岱山海相软土动弹性模量及阻尼比试验研究[J].岩石力学与工程学报,2014(7):1503-1512.WANG Mingyuan,SHAN Zhigang,WANG Yajun,et al.Dynamic elastic moduli and damping ratios of marine sediments at Zhoushan Daishan based on dynamic triaxial tests under strain control[J].Chinese Journal of Rock Mechanics&Engineering,2014,33(7):1503-1512.
[8]徐毅青,唐益群,任兴伟,等.地铁振动荷载作用下隧道周围加固软黏土动弹性模量试验[J].工程力学,2012,29(7):250-255.XU Yiqing,TANG Yiqun,REN Xingwei,et al.Experimental study on dynamic elastic modulus of reinforced soft clay around subway tunnel under vibration loading[J].Engineering Mechanics,2012,29(7):250-255.
[9]刘飞禹,蔡袁强,徐长节,等.循环荷载软土动弹性模量衰减规律研究[J].浙江大学学报(工学版),2008,42(9):1479-1483.LIU Feiyu,CAI Yuanqiang,XU Changjie,et al.Degradation of dynamic elastic modulus of soft clay under cyclic loading[J].Journal of Zhejiang University(Engineering Science),2008,42(9):1479-1483.
[10]邱成春,张孟喜.水平-竖向加筋饱和砂土动弹性模量试验研究[J].岩土力学,2012,33(6):71-76,106.QIU Chengchun,ZHANG Mengxi.Test research on dynamic elastic modulus of saturated sand reinforced with horizontal-vertical inclusions[J].Rock&Soil Mechanics,2012,33(6):71-76,106.
[11]郑刚,霍海峰,雷华阳,等.振动频率对饱和黏土动力特性的影响[J].天津大学学报(自然科学与工程技术版),2013,46(1):38-43.ZHEN Gang,HUO Haifeng,LEI Huayang,et al.Contrastive study on the dynamic characteristics of saturated clay in different vibration frequencies[J].Journal of Tianjin University(Science and Technology),2013,46(1):38-43.
[12]李又云,谢永利,刘保健.路基压实黄土动力特性的试验研究[J].岩石力学与工程学报,2009,28(5):1037-1046.LI Youyun,XIE Yongli,LIU Baojian.Experimental research on dynamic characteristics of roadbed compaction loess[J].Chinese Journal of Rock Mechanics&Engineering,2009,28(5):1037-1046.
[13]廖红建,肖正华,刘健.动载下饱和重塑黄土的骨干曲线变化研究[J].岩土力学,2011,32(2):375-379.LIAO Hongjian,XIAO Zhenghua,LIU Jian.Study of variation of backbone curve of saturated remolded loess under dynamic loading[J].Rock&Soil Mechanics,2011,32(2):375-379.
[14]DARENDELI M B.Development of a new family of normalized modulus reduction and material damping curves[D].Austin,USA:University of Texas at Austin,2001:54-104.
[15]李校兵,谷川,蔡袁强.循环偏应力和循环围压耦合应力路径下饱和软黏土动模量衰减规律研究[J].岩土工程学报,2014,36(7):1218-1226.LI Xiaobing,GU Chuan,CAI Yuanqiang.Dynamic modulus degradation for soft saturated clay under coupling stress paths of cyclic deviatoric stress and cyclic confining pressure[J].Chinese Journal of Geotechnical Engineering,2014,36(7):1218-1226.
[16]刘家顺.高速铁路粉质粘土地基静、动力特性及沉降规律研究[D].北京:辽宁工程技术大学土木与交通学院,2015:66-71.LIU Jiashun.Research on the static and dynamic characteristic of silty clay and the settlement law of subgrade of high speed railway[D].Beijing:Liaoning Technical University.College of Civil and Transportation Engineering,2015:66-71.
[17]JTG E40-2007,公路土工试验规程[S].JTG E40-2007,Test methods of soils for highway engineering[S].
[18]TB 10102-2010,铁路工程土工试验规程[S].TB 10102-2010,Code for soil test of railway engineering[S].
[19]谢定义.土动力学[M].北京:高等教育出版社,2011:218-263.XIE Dingyi.Soils dynamics[M].Beijing:Higher Education Press,2011:218-263.
[20]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:design equations and curves[J].Geotechnical Special Publication,1972,98(118):667-692.
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