土石坝料动力试验数据的一种统计公式
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摘要
坝料动力特性是土石坝动力分析的重要参数。大型土石坝工程一般直接进行坝料动三轴试验,确定动力参数;而中小型工程,则大多采用工程类比法确定。本文在对现有的国内外试验数据进行系统整理与分析的基础上,给出了堆石料、心墙料的等效动剪切模量比和等效阻尼比随动剪应变非线性变化的统一数学表达式。这些公式可用于判定坝料动力试验成果的合理性,也可直接用作坝体动力参数敏感性分析及中小型土坝的坝料动参数。
The dynamic characteristics of dam materials are the important factors for the dynamic analysis during the seismic design of embankment dam.For determining the dynamic parameters,the dynamic triaxial test is generally used for large embankment dams,but the engineering analogy method is often used for small and medium projects.Here based on the analyses of test data at home and abroad,the mathematical expressions of equivalent dynamic shear modulus ratio and dynamic damping ratio with dynamic shear strain are established for rockfill materials and core wall materials.The proposed expressions could be used for judging the reasonableness of dynamic test results,they could also be used for the dynamic sensitivity analysis of embankment dams.
The dynamic characteristics of dam materials are the important factors for the dynamic analysis during the seismic design of embankment dam.For determining the dynamic parameters,the dynamic triaxial test is generally used for large embankment dams,but the engineering analogy method is often used for small and medium projects.Here based on the analyses of test data at home and abroad,the mathematical expressions of equivalent dynamic shear modulus ratio and dynamic damping ratio with dynamic shear strain are established for rockfill materials and core wall materials.The proposed expressions could be used for judging the reasonableness of dynamic test results,they could also be used for the dynamic sensitivity analysis of embankment dams.
引文
[1]孔宪京,娄树莲,邹德高,等.筑坝堆石料的等效动剪切模量与等效阻尼比[J].水利学报,2001,(8):20-25.
[2]Rillins K M,et al.Shear modulus and damping relationshipsfor gravels[J].Journal of Geotechnical and GeoenvironmentalEngineering,1998,124(5):396-405.
[3]栾茂田,吴兴征,阴吉英,等.堆石料动力特性参数对面板堆石坝三维非线性地震响应的影响[J].水力发电学报,2001,(1):7-18.
[4]Hardin B O,Drnevich V P.Shear modulus and damping insoils:design equations and curves[J].Journal of Soils Me-chanics and Foundation Division,ASCE,1972,98(7):667-692.
[5]顾淦臣,沈长松,岑威钧.土石坝地震工程[M].北京:中国水利水电出版社,2009.
[6]Seed H B,Idriss I M.Soil moduli and damping factors fordynamic response analysis[R].Report EERC 70-10,Univer-sity of California,Earthquake Engineering Research Center,Berkeley,CA,1970.
[7]Sherif M A,Ishibashi I.Dynamic shear moduli for dry sands[J].J.Geotechnical Engineering Division,1986,102(GT11):1171-1184.
[8]Sherif M A,Ishibashi I,Gaddah A H.Damping ratio for drysands[J].J.Geotechnical Engineering Division,1977,103(GT7):743-756.
[9]Iwasaki T,Tatsuoka F,Takagi Y.Shear moduli of sands un-der cyclic torsional shear loading[J].Soils and Foundations,1978,18(1):39-56.
[10]Tatsuoka F,Iwasaki T,Takagi Y.Hysteretic damping ofsands under cyclic loading and its relation to shear modulus[J].Soils and Foundations,1978,18(2):25-40.
[2]Rillins K M,et al.Shear modulus and damping relationshipsfor gravels[J].Journal of Geotechnical and GeoenvironmentalEngineering,1998,124(5):396-405.
[3]栾茂田,吴兴征,阴吉英,等.堆石料动力特性参数对面板堆石坝三维非线性地震响应的影响[J].水力发电学报,2001,(1):7-18.
[4]Hardin B O,Drnevich V P.Shear modulus and damping insoils:design equations and curves[J].Journal of Soils Me-chanics and Foundation Division,ASCE,1972,98(7):667-692.
[5]顾淦臣,沈长松,岑威钧.土石坝地震工程[M].北京:中国水利水电出版社,2009.
[6]Seed H B,Idriss I M.Soil moduli and damping factors fordynamic response analysis[R].Report EERC 70-10,Univer-sity of California,Earthquake Engineering Research Center,Berkeley,CA,1970.
[7]Sherif M A,Ishibashi I.Dynamic shear moduli for dry sands[J].J.Geotechnical Engineering Division,1986,102(GT11):1171-1184.
[8]Sherif M A,Ishibashi I,Gaddah A H.Damping ratio for drysands[J].J.Geotechnical Engineering Division,1977,103(GT7):743-756.
[9]Iwasaki T,Tatsuoka F,Takagi Y.Shear moduli of sands un-der cyclic torsional shear loading[J].Soils and Foundations,1978,18(1):39-56.
[10]Tatsuoka F,Iwasaki T,Takagi Y.Hysteretic damping ofsands under cyclic loading and its relation to shear modulus[J].Soils and Foundations,1978,18(2):25-40.
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