沥青路面加铺结构中土工布夹层黏结失效时温特性

发布时间：2018-03-28 08:09

本文选题：道路工程　切入点：土工布　出处：《湖南大学学报(自然科学版)》2017年11期

【摘要】：针对含土工布夹层的双层沥青混合料试件进行直剪试验,以层间抗剪强度为指标,通过方差分析和多重比较分析了温度和加载速率对土工布夹层黏结失效的影响作用,建立了含土工布夹层试件的层间抗剪强度与温度、加载速率的数学关系,基于时间-温度等效原理确定了层间抗剪强度sigmodial主曲线,并对其时温等效特性进行了验证.结果表明:含土工布夹层试件层间抗剪强度受温度和加载速率显著影响,随温度升高或加载速率下降其值逐渐降低;指数模型对层间抗剪强度拟合效果良好,模型预估值与试验测试值基本吻合.sigmodial主曲线在更宽加载速率范围内表征了层间抗剪强度的变化趋势,黏层油蠕变柔量与层间抗剪强度两力学参量的移位因子一致性验证了土工布夹层黏结失效具有时温等效特性.
[Abstract]:The direct shear test of double-layer asphalt mixture with geotextile sandwich was carried out. The effect of temperature and loading rate on the failure of geotextile interlayer adhesion was analyzed by means of variance analysis and multiple comparisons, taking the interlayer shear strength as the index. The mathematical relationship between interlaminar shear strength and temperature, loading rate of interlayer specimens with geotextile sandwich is established. Based on the principle of time-temperature equivalence, the sigmodial main curve of interlaminar shear strength is determined. The results show that the interlaminar shear strength of geotextile sandwich specimens is significantly affected by temperature and loading rate, and decreases gradually with the increase of temperature or the decrease of loading rate. The exponential model has good fitting effect on the shear strength between the layers, and the model pre-estimate is in good agreement with the test value. The main curve of sigmodial shows the change trend of the interlaminar shear strength in a wider loading rate range. The consistency of displacement factor between creep compliance and interlaminar shear strength shows that geotextile interlayer bonding failure has time-temperature equivalent property.
【作者单位】：长安大学道路结构与材料交通行业重点实验室;长安大学公路学院;
【基金】：国家自然科学基金资助项目(51478046) 长安大学优秀博士学位论文培育资助项目(310821150015)~~
【分类号】：U416.217

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