筑坝反滤料动剪切模量和阻尼比影响因素试验研究
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摘要
采用多功能静动三轴仪开展了筑坝反滤料的动剪切模量和阻尼比试验,并对其影响因素进行了试验对比分析,建议了一个综合反应固结应力比、孔隙比和试验级配特征的最大动剪切模量计算公式。试验和分析结果表明,固结应力比对最大动剪切模量的影响可采用幂函数来进行拟合,孔隙比的影响可采用指数函数来进行拟合,试验级配的影响可通过不均匀系数Cu和曲率系数Cc的线性函数来表达。各种影响因素对阻尼比均有影响,但各种情况下的阻尼比试验结果都在一个很小的范围内,可采用平均值计算。
Tests of dynamic shear modulus and damping ratio of dam inverted filler are carried out by multi-function triaxial apparatus;and testing contrast analysis is made of the influencing factors.A comprehensive formula,which takes into consideration the consolidation stress ratio,void ratio and test grading curve,and can be used to calculate the maximum dynamic shear modulus,is proposed.The test and analysis results show that the influence of consolidation stress ratio can be fitted by power function,that of void ratio can be fitted by exponential function,and that of test grading curve can also be fitted by linear function with nonuniform coefficient Cu and curvature coefficient Cc.All kinds of influences affect the damping ratio.But the test results are in a narrow range,which means an average value can be used to calculate the damping ratio under different influences.
Tests of dynamic shear modulus and damping ratio of dam inverted filler are carried out by multi-function triaxial apparatus;and testing contrast analysis is made of the influencing factors.A comprehensive formula,which takes into consideration the consolidation stress ratio,void ratio and test grading curve,and can be used to calculate the maximum dynamic shear modulus,is proposed.The test and analysis results show that the influence of consolidation stress ratio can be fitted by power function,that of void ratio can be fitted by exponential function,and that of test grading curve can also be fitted by linear function with nonuniform coefficient Cu and curvature coefficient Cc.All kinds of influences affect the damping ratio.But the test results are in a narrow range,which means an average value can be used to calculate the damping ratio under different influences.
引文
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[9]HARDIN B O,RICHART F E.Elastic wave velocities in granular soils[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1963,89(SM1):33-65.
[10]HARDIN B O.The nature of damping in sands[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1965,91(SM1):63-97.
[11]TATSUOKA F,IWASAKI T,TAKAGi Y.Hysteretic damping of sands under cyclic loading and its relation to shear modulus[J].Soils and Foundations,Japanese Society of Soil Mechanics and Foundation Engineering,1978,18(2):25-40.
[12]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.CHEN Guo-xing,XIE Jun-fei,ZHANG Ke-xu.The empirical evaluation of soil moduli and damping ratio for dynamic analysis[J].Earthquake Engineering and Engineering Vibration,1995,15(1):73-84.
[13]贺建清,张家生.石灰土填料动力特性试验研究[J].湖南科技大学学报(自然科学版).2005,20(4):58-63.HE Jian-qing,ZHANG Jia-sheng.Experimental study on dynamic properties of soft soil treated with lime under cyclic loading[J].Journal of Hunan University of Science&Technology(Natural Science Edition),2005,20(4):58-63.
[14]SILVER M L,SEED H B.Deformation characteritistics of sands under cyclic loading[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1971,97(SM8):1081-1098.
[2]PARK I J,DESAI C S.Cyclic behavior and liquefaction of sand using disturbed state concept[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2000,126(9):834-846.
[3]高广运,时刚,顾中华,等.一个考虑循环荷载作用的简化模型[J].岩土力学.2008,29(5):1195-1199.GAO Guang-yun,SHI Gang,GU Zhong-hua,et al.A simplified elastoplastic constitutive model under undrained cyclic loading[J].Rock and Soil Mechanics,2008,29(5):1195-1199.
[4]陈学良,金星,陶夏新,等.考虑试验阻尼效应的一种土体动力双型抛物线本构模型[J].岩土力学,2008,29(8):2102-2110.CHEN Xue-liang,JIN Xing,TAO Xia-xin,et al.A soil dynamic double-parabola constitutive model considering effect of soil test damping[J].Rock and Soil Mechanics,2008,29(8):2102-2110.
[5]袁晓铭,孙静.非等向固结下砂土最大动剪切模量增长模及Hardin公式修正[J].岩土工程学报,2005,27(3):264-269.YUAN Xiao-ming,SUN Jing.Model of maximum dynamic shear modulus of sand under anisotropic consolidation and revision of Hardin’s formula[J].Chinese Journal of Geotechnical Engineering,2005,27(3):264-269.
[6]何昌荣.动模量和阻尼的动三轴试验研究[J].岩土工程学报,1997,19(2):39-48.HE Chang-rong.Dynamic triaxial test on modulus and damping[J].Chinese Journal of Geotechnical Engineering,1997,19(2):39-48.
[7]祝龙根,吴晓峰.低幅应变条件下砂土动力特性的研究[J].水电自动化与大坝监测.1988,12(1):27-33.ZHU Long-gen,WU Xiao-feng.A study of dynamic properties of sand under the low amplitude strain[J].Hydropower Automation and Dam Monitoring,1988,12(1):27-33.
[8]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.KONG Xian-jing,LOU Shu-lian,ZOU De-gao,et al.The equivalent dynamic shear modulus and equivalent damping ratio of rockfill material for dam[J].Journal of Hydraulic Engineering,2001,(8):20-25.
[9]HARDIN B O,RICHART F E.Elastic wave velocities in granular soils[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1963,89(SM1):33-65.
[10]HARDIN B O.The nature of damping in sands[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1965,91(SM1):63-97.
[11]TATSUOKA F,IWASAKI T,TAKAGi Y.Hysteretic damping of sands under cyclic loading and its relation to shear modulus[J].Soils and Foundations,Japanese Society of Soil Mechanics and Foundation Engineering,1978,18(2):25-40.
[12]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.CHEN Guo-xing,XIE Jun-fei,ZHANG Ke-xu.The empirical evaluation of soil moduli and damping ratio for dynamic analysis[J].Earthquake Engineering and Engineering Vibration,1995,15(1):73-84.
[13]贺建清,张家生.石灰土填料动力特性试验研究[J].湖南科技大学学报(自然科学版).2005,20(4):58-63.HE Jian-qing,ZHANG Jia-sheng.Experimental study on dynamic properties of soft soil treated with lime under cyclic loading[J].Journal of Hunan University of Science&Technology(Natural Science Edition),2005,20(4):58-63.
[14]SILVER M L,SEED H B.Deformation characteritistics of sands under cyclic loading[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1971,97(SM8):1081-1098.
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