昆明黏性土动力特性试验研究
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摘要
对昆明地区黏性土进行室内的共振柱试验和动三轴试验,初步研究了该地区黏性土的动力特性,得出了不同初始固结比下黏性土的动强度曲线,比较了黏土与粉质黏土的动强度受固结应力比的差异,并对黏性土的动强度与破坏时其振动周数之间的关系曲线进行了拟合,给出了其数学表达式。根据试验所得动强度包线的特征和动强度参数,分析了黏性土强度参数的变化规律,以及固结应力比对黏性土动强度的影响。并对黏性土的关系G~γ曲线和D~γ关系曲线的简单规律进行了描述,σm和Gmax在双对数坐标上可以用Janbu经验公式拟合,以确定最大剪切模量。
A series of laboratory tests about dynamic strength of clay were performed,as a result the dynamic characteristics and dynamic strength envelope characteristics of clay were preliminary obtained.The paper reveals the influences of different initial consolidation ratios on dynamic strength and dynamic strength envelope.According to the dynamic strength envelope and dynamic strength parameters from the tests,both the variation of strength parameters of clay and the influence of the initial consolidation ratios on the dynamic strength of cohesive soil were studied.Simple relationships between dynamic shear moduli G and dynamic shear strain γ and between damping ratio D and dynamic shear strain γ were studied.
A series of laboratory tests about dynamic strength of clay were performed,as a result the dynamic characteristics and dynamic strength envelope characteristics of clay were preliminary obtained.The paper reveals the influences of different initial consolidation ratios on dynamic strength and dynamic strength envelope.According to the dynamic strength envelope and dynamic strength parameters from the tests,both the variation of strength parameters of clay and the influence of the initial consolidation ratios on the dynamic strength of cohesive soil were studied.Simple relationships between dynamic shear moduli G and dynamic shear strain γ and between damping ratio D and dynamic shear strain γ were studied.
引文
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[8]高博,张鸿儒.邯郸与太原两地粉土动力特性的试验研究[J].工程地质学报,2008,16(4):503-508.
[2]韦复才.桂林红黏土的物质组成及其工程地质性质特征[J].江西师范大学学报:自然科学版,2005(29),5:460-464.
[3]孙向楠,薛伟.红黏土试验及在路基填筑中的应用[J].公路,2005(6),6:83-87.
[4]余湘娟,房震,鲍陈阳,等.煤矸石动强度特性试验研究[J].岩土力学,2005,26(增刊):102-104.
[5]吴世明,周健,黄茂松,等.土动力学[M].北京:中国建筑工业出版社,2000.
[6]殷宗泽,王宝田,余湘娟,等.土工原理[M].北京:中国水利水电出版社,2007.
[7]胡庆兴,刘雪珠,从卫民,等.淮安市典型土动力特性的试验研究[J].地震工程与工程振动,2003(23),6:144-148.
[8]高博,张鸿儒.邯郸与太原两地粉土动力特性的试验研究[J].工程地质学报,2008,16(4):503-508.
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