基于含水率变化宕渣土石混合料回弹模量的试验研究

发布时间：2018-07-08 17:02

本文选题：回弹模量 + 最佳含水率　；参考：《中外公路》2017年02期

【摘要】：路基回弹模量在中国路面结构设计、施工质量以及使用性能的评价中,是反映路基抗外荷载能力与抗变形能力的重要力学参数,而其含水率更是路基回弹模量的重要影响因素。鉴于目前鲜有用循环压缩法研究含水率的改变对宕渣路基回弹模量影响的试验,该文选定3种级配作为研究对象,通过重型击实试验测出每种级配的最佳含水率,在每种级配的最佳含水率附近取5个含水率来制备循环压缩试件,以测定在3种级配下不同含水率对宕渣路基回弹模量影响规律。研究发现,含水率与宕渣土石混合料的回弹模量呈二次抛物线关系;用宕渣做路基时,应该考虑其级配组成,当级配满足泰勒公式和不均匀系数、曲率系数时,含水率对宕渣土石混合料的回弹模量的影响较小;宕渣土石混合料回弹模量值随粗料P5含量的增大而增大,其回弹模量与加载次数的变化呈对数关系;该文建议采用级配2的宕渣土石混合料来作为路基填筑材料级配。
[Abstract]:The elastic modulus of subgrade is an important mechanical parameter to reflect the ability of roadbed to resist external load and deformation in the evaluation of pavement structure design, construction quality and performance in China, and its moisture content is an important factor that affects the modulus of subgrade resilience. In view of the fact that the cyclic compression method is rarely used to study the effect of the change of moisture content on the resilience modulus of slag subgrade, three grades are selected as the object of study, and the optimum moisture content of each grade is measured by heavy compaction test. In order to determine the effect of different moisture content on the modulus of resilience of slag roadbed, the cyclic compression specimens were prepared by taking 5 moisture contents near the optimal moisture content of each grade. It is found that there is a parabola relationship between moisture content and the modulus of springback of the mixture, and when the slag is used as the subgrade, the gradation composition should be considered, when the gradation satisfies the Taylor formula, the uneven coefficient and the curvature coefficient, Moisture content has little effect on the resilience modulus of dang residual-stone mixture, and the elastic modulus value increases with the increase of coarse P5 content, and the change of resilience modulus is logarithmic with the change of loading times. In this paper, it is suggested that gradation 2 should be used as gradation of subgrade filling material.
【作者单位】：沈阳建筑大学交通学院;浙江省交通科学研究院;浙江大学交通研究所;
【基金】：国家自然科学基金资助项目(编号:51478276) 辽宁省公路科研项目(编号:201601)
【分类号】：U416

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