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动弹模量与阻尼比是土动力分析最基本的力学参数,一般通过较小应变范围的动三轴试验得到,测试技术的可靠性与试验参数求取的准确性是进行抗震安全性评估的关键。通过室内动三轴试验,比较了力与位移传感器内置与外置、不同相对位置等因素对滞回圈、动弹模量与阻尼比的影响,提出了针对存在残余变形的不闭合滞回圈的动弹模量与阻尼比的计算方法,比较了频率、围压、固结比等因素对试验成果的影响规律及特征,并在Janbu公式中引入固结比的幂函数影响因子,对不同围压、不同固结比下的动弹模量阻尼比进行了归一化特性研究。研究成果有利于提高国内科研机构在土动力参数测试方面的能力,对抗震工程与科研有积极的参考价值。
Dynamic modulus and damping ratio are the most basic mechanical parameters of soil dynamic analysis. They are generally obtained through dynamic triaxial tests with small strain range. The reliability of test techniques and the accuracy of test parameters are the keys to seismic safety assessment . Through the indoor three-axis test, the influences of the built-in and the external, different relative positions of force and displacement sensors on the hysteresis loop, the dynamic elastic modulus and the damping ratio were compared. Aiming at the problem that there is a residual hysteresis loop with residual deformation Dynamic modulus and damping ratio of the calculation method to compare the frequency, confining pressure, consolidation ratio and other factors on the test results of the law and characteristics, and the Janbu formula to introduce the consolidation ratio of the power function of the impact factor, the confining pressure , Different consolidation ratio of the dynamic elastic modulus damping ratio of the normalization characteristics of the study. The research results are conducive to improving the capability of domestic research institutes in testing soil dynamic parameters and have positive reference value for earthquake engineering and research.