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通过室内重复加载三轴试验研究3种级配碎石的回弹特性,分析体应力、偏应力、含水量、级配类型对回弹模量的影响。试验结果表明,级配碎石回弹模量随含水量的减小、围压应力的增大而显著增大;随偏应力的增大而缓慢增大或先略有减小再缓慢增大(低应力状况下);级配类型对回弹模量也有一定影响。应用非线性回归方法得到NCHRP 1-28A本构模型参数,将拟合得到的模型参数与物性试验结果相联系,建立基于物性指标的模型参数预估公式。
Through the three-axis indoor repeated loading test, the rebound characteristics of three kinds of graded macadam were studied. The effects of body stress, deviatoric stress, water content and gradation on the elastic modulus were analyzed. The experimental results show that the elastic modulus of graded macadam increases with the decrease of water content and confining pressure, increases slowly with the increase of deviatoric stress or decreases slightly first and then slowly increases (Low stress conditions); the type of grading also has a certain impact on the modulus of elasticity. The parameters of NCHRP 1-28A constitutive model are obtained by using the nonlinear regression method. The parameters of the model are correlated with the results of the physical property test, and the prediction formula of the model parameters based on the physical property index is established.