围压对黏土动力特性影响的试验研究
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摘要
以某工程场地黏土为研究对象,结合工程实际,考虑不同固结围压对黏土动力特性的影响。通过循环振动三轴试验,对黏土在选定的5组固结围压状态下表现出来的动力特性进行研究,得出固结围压的变化对其产生的影响。在研究的固结围压范围内,固结围压对黏土最大动剪模量的影响显著,随围压的增大呈幂指数增长;对动剪模量比曲线与阻尼比曲线的影响均较小,简化起见,将其分别作归一化处理。数据处理过程中引入Darendeli M B等的研究成果,对试验成果进行统计回归分析,得到Gd/Gdmax-γd关系曲线的归一化表达式,间接得到了λd-γd归一化表达式。
Based on the actual situation of engineering,the clay of one engineering site is studied,the influences of different confining stress are considered.Through dynamic triaxial test,dynamic characteristics of the clay under 5 selected confining stresses are studied;the impacts of confining stresses on it are concluded.In the range of analyzed confining stress,the influce of the maximum dynamic shear modulus is very significant,and it is the exponential growth with the increase in confining stress;the influence of dynamic shear modulus ratio and damping ratio is small,for simplicity,respectively for the normalization process.The research results of M.B.Darendeli were introduced into data processing,the Gd/ Gdmax-γdnormalized expression was received with statistical regression analysis of the test results,and the λd-γdnormalized expression was also received indirectly.The data would be great valuable to engineering practices.
Based on the actual situation of engineering,the clay of one engineering site is studied,the influences of different confining stress are considered.Through dynamic triaxial test,dynamic characteristics of the clay under 5 selected confining stresses are studied;the impacts of confining stresses on it are concluded.In the range of analyzed confining stress,the influce of the maximum dynamic shear modulus is very significant,and it is the exponential growth with the increase in confining stress;the influence of dynamic shear modulus ratio and damping ratio is small,for simplicity,respectively for the normalization process.The research results of M.B.Darendeli were introduced into data processing,the Gd/ Gdmax-γdnormalized expression was received with statistical regression analysis of the test results,and the λd-γdnormalized expression was also received indirectly.The data would be great valuable to engineering practices.
引文
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[2]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73-84.
[3]Hardin B O,Black W L.Vibration Modulus of Normally Consoli-dated Clay:Design Equations and Curves[J].Journal of the SoilMechanics and Foundation Engineering Division,ASCE,1968,94(2):353-369.
[4]Hardin B O,Black W L.Closure to Vibration Modulus of NormallyConsolidated Clay:Design Equations and Curves[J].Journal ofthe Soil Mechanics and Foundation Engineering Division,ASCE,1969,95(6):1531-1537.
[5]Hardin B O,Drnevich V P.Shear Modulus and Damping in Soil:Measurement and Parameter Effects[J].Journal of the Soil Me-chanics and Foundation Engineering Division,ASCE,1972,98(6):603-624.
[6]Hardin B O,Drnevich V P.Shear Modulus and Damping in Soil:Design Equations and Curves[J].Journal of the Soil Mechanic-sand Foundation Engineering Division,ASCE,1972,98(7):667-692.
[7]蒋通,邢海灵.围压对土动剪模量和阻尼比影响的简化计算方法[J].岩石力学与工程学报,2007,26(7):1432-1437.
[8]SL237—1999土工试验规程[S].
[9]毛尚礼,余湘娟,张富有.昆明黏性土动力特性试验研究[J].地震工程与工程振动,2011,31(2):170-174.
[10]尚守平,卢华喜,任慧,等.动荷载作用下土阻尼比的试验对比研究[J].地震工程与工程振动,2006,26(2):161-165.
[11]王志杰,骆亚生.初始主应力方向角对黄土动变形特性影响研究[J].地震工程与工程振动,2013,33(1):184-191.
[12]Darendeli M B.Development of a New Family of Normalized Modu-li Reduction and Material Damping Curves[D].Austin:Universityof Texas at Austin,2001.
[13]谢定义.土动力学[M].北京:高等教育出版社,2011.
[14]张家明,刘文连,徐则民,等.西昌昔格达组黏土岩动力特性试验研究[J].地震工程与工程振动,2012,32(1):154-160.
[15]Borden R H,Shao L,Gupta A.Dynamic Properties of PiedmontResidual Soils[J].Journal of Geotechnical Engineering,ASCE,1996,122(10):813-821.
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