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针对双曲线关系不能很好地拟合土动模量随动力作用水平的退化,及Hard in和D rnevich的确定阻尼比的公式低估了动力作用水平低于一定值时的阻尼比的问题,基于3种黏性土动模量的试验结果,提出了一个能很好拟合动模量退化的数学关系,式中所包括的参数少且容易确定.研究了固结压力对动模量退化的不可忽视的影响,提出了一个确定阻尼比的改进公式.上述成果可以合理地确定动力分析中土的动模量和阻尼比,提高分析结果的可信性.
According to the hyperbolic relationship, the problem that the dynamic modulus of soil can not be well fitted with the degradation of dynamic force level and the damping ratio formula of Hard in and D rnevich underestimate the damping ratio when the dynamic force level is lower than a certain value, Three kinds of clay soil test results of the dynamic modulus, put forward a good fit dynamic modulus degradation of the mathematical relationship, including the parameters included in the small and easy to determine the consolidation pressure on the dynamic modulus of degradation We can not neglect the effect and propose an improved formula to determine the damping ratio.The above results can reasonably determine the dynamic modulus and damping ratio of soil in dynamic analysis and improve the credibility of the analysis results.