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基床级配碎石在外界雨水侵入时含水状态发生改变对其变形特性不利,从而影响行车安全,但目前研究含水率对基床级配碎石变形特性的成果甚少,为进一步揭示不同含水状态下基床级配碎石的变形特性,对不同含水率的级配碎石试样开展了多组大型静动三轴试验。首先,通过静三轴试验探讨了含水率对级配碎石应力-应变关系和强度特性的影响;然后,基于动三轴试验,重点研究了含水率、动应力水平对累积应变随荷载作用次数发展规律的影响;在此基础上,建立了综合考虑含水率、荷载作用次数、动应力水平相互耦合作用的累积应变预测模型。基于含水率为5.0%和7.3%的累积应变试验结果,确定了模型中的待定参数,通过含水率为8.6%的试验结果验证了其正确性和合理性,此模型不仅克服了不同动应力水平下累积应变计算模型的分散性,而且能够直观地体现出含水率对累积应变的影响。
However, the research of water content has little effect on the deformation characteristics of bedrock graded gravel. In order to further reveal the effect of different water content State, the deformation characteristics of bed graded macadam, multi-group large-scale static and dynamic triaxial tests on graded macadam samples with different water content. First of all, the influence of water content on the stress-strain relationship and strength characteristics of graded macadam was studied by static triaxial test. Then, based on the dynamic triaxial test, the influence of moisture content and dynamic stress on cumulative strain On the basis of this, a model of cumulative strain prediction based on the coupling effect of moisture content, times of loading and dynamic stress is established. Based on the cumulative strain test results of 5.0% and 7.3% moisture content, the parameters to be determined in the model were determined. The correctness and rationality of the model were verified by the experimental results of 8.6% moisture content. The model not only overcomes the different dynamic stress levels Under the cumulative strain calculation model of dispersion, and can intuitively reflect the moisture content of the cumulative strain.