苏州第四纪沉积土动剪切模量比和阻尼比试验研究
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摘要
通过深入分析苏州第四纪土的海相、陆相沉积环境及土层分布特征,对苏州第四纪土311个原状土样进行了土的动剪切模量比和阻尼比试验研究,结果发现:海侵作用和土层深度对苏州第四纪各类土的动剪切模量比、阻尼比与剪应变幅值关系曲线的影响有明显差异,深度0～30 m的海相黏土动剪切模量比和阻尼比曲线分别低于和高于陆相黏土的曲线,深度30～100 m的海相黏土动剪切模量比和阻尼比曲线分别高于和低于陆相黏土的曲线;土层深度对海相黏土、粉质黏土和海、陆相粉细砂的动剪切模量比曲线以及对海相黏土、粉质黏土和陆相粉细砂的阻尼比曲线的影响较为明显;对黏土、粉质黏土、粉土、粉细砂按土层深度0～30 m和30～100 m以及淤泥质土、中粗砂不区分土层深度,给出了苏州第四纪各类土的动剪切模量比和阻尼比曲线经验关系的拟合参数值及其平均关系曲线推荐值。
Based on the comprehensive analysis of the marine and continental depositional environments and distribution characteristics,the comparative experiments are carried out on 311 undisturbed soil samples to study the dynamic shear modulus ratio and damping ratio of Suzhou quaternary sedimentary soils.The results show that the influences of transgression and soil depth are significantly different for various Suzhou quaternary sedimentary soils on the relationship between shear modulus ratio and shear strain as well as between damping ratio and shear strain.The dynamic shear modulus ratio and damping ratio of marine clay at the depth of 0～30 m are smaller and larger than those of continental clay at the same elevation,respectively.However,a contrary relationship exists for the marine clay at the depth of 30～100 m.The depth has a distinct impact on the curves of dynamic shear modulus ratio with shear strain for the marine clay,silt clay,silt sand and continental silt sand as well as on the curves of damping ratio for the marine clay,silt clay and continental silt sand.The fitting parameters and recommended values for the average curves of dynamic shear modulus ratio and damping ratio are given after distinguishing the clay,silt clay,silt and silt sand layers from the depth of 30 m while keeping muddy soil and medium coarse sand as one layer.
Based on the comprehensive analysis of the marine and continental depositional environments and distribution characteristics,the comparative experiments are carried out on 311 undisturbed soil samples to study the dynamic shear modulus ratio and damping ratio of Suzhou quaternary sedimentary soils.The results show that the influences of transgression and soil depth are significantly different for various Suzhou quaternary sedimentary soils on the relationship between shear modulus ratio and shear strain as well as between damping ratio and shear strain.The dynamic shear modulus ratio and damping ratio of marine clay at the depth of 0～30 m are smaller and larger than those of continental clay at the same elevation,respectively.However,a contrary relationship exists for the marine clay at the depth of 30～100 m.The depth has a distinct impact on the curves of dynamic shear modulus ratio with shear strain for the marine clay,silt clay,silt sand and continental silt sand as well as on the curves of damping ratio for the marine clay,silt clay and continental silt sand.The fitting parameters and recommended values for the average curves of dynamic shear modulus ratio and damping ratio are given after distinguishing the clay,silt clay,silt and silt sand layers from the depth of 30 m while keeping muddy soil and medium coarse sand as one layer.
引文
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[19]韦桃源.长江三角洲东部地区第四纪海侵地层、古气候古季风演化研究[D]上海:华东师范大学,2004.(WEITao-yuan.The quaternery transgression and paleoclimate-monsoon evolution of eastern Changjiang Delta,China[D].Shanghai:East China Normal University,2004.(in Chinese))
[20]于振江,郭盛乔,梁晓红,等.长江三角洲(江南)地区第四纪海侵层的划分及时代归属[J].地层学杂志,2005,29(增刊):618-625.(YU Zhen-jiang,GUO Sheng-qiao,LIANG Xiao-hong,et al.Division and age assignment of thequaternary transgression layers in the Yangeze DeltaArea(Southern Yangeze)[J].Journal of Stratigraphy,2005,25(S0):618-625.(in Chinese))
[21]陈国兴,朱定华,何启智.GZZ-1型自振柱试验机研制与性能试验[J].地震工程与工程振动,2003,23(1):110-114.(CHEN Guo-xing,ZHU Ding-hua,HE Qi-zhi.Developmentand property test of gzz-1 free vibration column testsystem[J].Earthquake Engineering and EngineeringVibration,2003,23(1):110-114.(in Chinese))
[2]王权民,李刚,陈正汉,等.厦门砂土的动力特性研究[J].岩土力学,2005,26(10):1628-1632.(WANG Quan-min,LI Gang,CHEN Zheng-han,et al.Research on dynamiccharacteristics of sands in Xiamen city[J].Rock and SoilMechanics,2005,26(10):1628-1632.(in Chinese))
[3]施春花,吕悦军,彭艳菊,等.北京地区粉质黏土土动力学参数的统计分析[J].震灾防御技术,2009,4(1):69-79.(SHI Chun-hua,LüYue-jun,PENG Yan-ju,et al.Statisticalanalysis of dynamic parameters of silty clay in Beijing area[J].Technology for Earthquake Disaster Prevention,2009,4(1):69-79.(in Chinese))
[4]吕悦军,唐荣余,沙海军.渤海海底土类动剪切模量比和阻尼比试验研究[J].防灾减灾工程学报,2003,23(2):35-42.(LüYue-jun,TANG Rong-yu,SHA Hai-jun.Experimental study on dynamic shear modulus ratio anddamping ratio of the soils of bohai seafloor[J].Journal ofDisaster Prevention and Mitigation Engineering,2003,23(2):35-42.(in Chinese))
[5]王志杰,骆亚生,王瑞瑞,等.不同地区原状黄土动剪切模量与阻尼比试验研究[J].岩土工程学报,2010,32(9):1464-1469.(WANG Zhi-jie,LUO Ya-sheng,WANG Rui-rui,etal.Experimental study on dynamic shear modulus anddamping ratio of undisturbed loess in different regions[J].Chinese Journal of Geotechnical Engineering,2010,32(9):1464-469.(in Chinese))
[6]尚守平,卢华喜,任慧,等.粉质黏土动剪切模量的试验对比研究[J].岩土工程学报,2006,28(3):410-414.(SHANG Shou-ping,LU Hua-xi,REN Hui,et al.Comparative study on dynamic shear modulus of silty clay[J].Chinese Journal of Geotechnical Engineering,2006,28(3):410-414.(in Chinese))
[7]张亚军,兰宏亮,崔永高.上海地区土动剪切模量比和阻尼比的统计研究[J].世界地震工程,2010,26(2):171-175.(ZHANG Ya-jun,LAN Hong-liang,CUI Yong-gao.Statistical studies on shear modulus ratios and damping ratiosof soil in Shanghai area[J].World Earthquake Engineering,2010,26(2):171-175.(in Chinese))
[8]张效龙,金永德,孙永福,等.天津滨海滩涂土动剪切模量比和动阻尼比试验[J].海洋地质动态,2005,21(8):27-30.(ZHANG Xiao-long,JIN Yong-de,SUN Yong-fu,et al.Experimental study on dynamic shear modulus and dampingratio of coastal beach soils in Tianjin area[J].Marine GeologyLetters,2005,21(8):27-30.(in Chinese))
[9]陈国兴,刘雪珠,朱定华,等.南京新近沉积土动剪切模量比与阻尼比的试验研究[J].岩土工程学报,2006,28(8):1023-1027.(CHEN Guo-xing,LIU Xue-zhu,ZHUDing-hua,et al.Experimental studies on dynamic shearmodulus ratio and damping ratio of recently deposited soils inNanjing[J].Chinese Journal of Geotechnical Engineering,2006,28(8):1023-1027.(in Chinese))
[10]王炳辉,陈国兴,胡庆兴.南京细砂动剪切模量和阻尼比的试验研究[J].世界地震工程,2010,26(3):7-15.(WANG Bing-hui,CHEN Guo-xing,HU Qing-xing.Experiment of dynamic shear modulus and damping ofNanjing fine sand[J].World Earthquake Engineering,2010,26(3):7-15.(in Chinese))
[11]HARDIN B O,DRNEVICH V P.Shear modulus anddamping in soils:design equations and curves[J].Journal ofSoil Mechanics and Foundation Engineering Division,1972,98(7):667-692.
[12]QIAN X,GRAY D H,WOODS R D.Voids andgranulometry:effects on shear modulus of unsaturatedsands[J].Journal of Geotechnical Engineering,1993,119(2):295-314.
[13]STOKOE K H,HWANG S K,LEE N J,et al.Effects ofvarious parameters on the stiffness and damping of soil atsmall to medium strains[C]//Sapporo,Japan:Proc,Int Symp,1994.
[14]ZHANG J,ANDRUS R D,JUANG C H.Normalized shearmodulus and material damping ratio relationships[J].Journalof Geotechnical and Geoenvironmental Engineering,2005,131(4):453-464.
[15]TRONCOSO J H,GARC S E.Ageing effects in the shearmodulus of soils[J].Soil Dynamics and EarthquakeEngineering,2000,19(8):595-601.
[16]袁晓铭,孙静.非等向固结下砂土最大动剪切模量增长模式及Hardin公式修正[J].岩土工程学报,2005,27(3):264-269.(YUAN Xiao-ming,SUN Jing.Model ofmaximum dynamic shear modulus of sand under anisotropicconsolidation and revision of Hardin's formula[J].ChineseJournal of Geotechnical Engineering,2005,27(3):264-269.(in Chinese))
[17]BORDEN R H,SHAO L,GUPTA A.Dynamic properties ofpiedment residual soils[J].Journal of Geotechnical andGeoenvironmental Engineering,1996,122(10):813-821.
[18]陈国兴,王炳辉,刘建达.新近沉积土的动剪切模量和阻尼比试验研究[J].地下空间与工程学报,2008,4(3):539-543.(CHEN Guo-xing,WANG Bing-hui,LIU jian-da.Experimental study on dynamic shear modulus and dampingratio of recently deposited soils[J].Chinese Journal ofUnderground Space and Engineering,2008,4(3):539-543.(in Chinese))
[19]韦桃源.长江三角洲东部地区第四纪海侵地层、古气候古季风演化研究[D]上海:华东师范大学,2004.(WEITao-yuan.The quaternery transgression and paleoclimate-monsoon evolution of eastern Changjiang Delta,China[D].Shanghai:East China Normal University,2004.(in Chinese))
[20]于振江,郭盛乔,梁晓红,等.长江三角洲(江南)地区第四纪海侵层的划分及时代归属[J].地层学杂志,2005,29(增刊):618-625.(YU Zhen-jiang,GUO Sheng-qiao,LIANG Xiao-hong,et al.Division and age assignment of thequaternary transgression layers in the Yangeze DeltaArea(Southern Yangeze)[J].Journal of Stratigraphy,2005,25(S0):618-625.(in Chinese))
[21]陈国兴,朱定华,何启智.GZZ-1型自振柱试验机研制与性能试验[J].地震工程与工程振动,2003,23(1):110-114.(CHEN Guo-xing,ZHU Ding-hua,HE Qi-zhi.Developmentand property test of gzz-1 free vibration column testsystem[J].Earthquake Engineering and EngineeringVibration,2003,23(1):110-114.(in Chinese))
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