土工格室加筋沥青混合料蠕变性能研究

Study on creep behavior of reinforced asphalt mixture in geocell

摘要

为了探究土工格室加筋沥青混合料的蠕变性能。借助MTS Landmark万能试验机，在1.0、1.2、1.5 MPa 3种加载条件下，对7种不同工况下的土工格室加筋沥青混合料进行了常温和高温环境下的单轴贯入蠕变试验。基于试验结果分析了土工格室加筋双面层和三面层沥青混合料的位移变化规律，并采用线性拟合方法对其时间-位移关系进行了精确处理，从而获得了各工况下的蠕变速率，对土工格室加筋沥青混合料的蠕变性能进行了深入研究。结果表明：土工格室加筋沥青混合料的蠕变速率均远小于无加筋沥青混合料，且双面层在3种规格土工格室加筋层沥青混合料工况中，200 mm的土工格室加筋沥青混合料蠕变速率为最大，150 mm次之，100 mm最小；三面层土工格室加筋沥青混合料，加筋位置在中面层时的蠕变速率均小于在上面层时，建议土工格室加筋沥青混合料在工程应用中将其置于中面层加筋；常温条件下双面层与三层加筋沥青混合料的蠕变速率较无格室分别降低28.56%和50.18%，高温条件下的降幅度更显著，达65.34%和81.92%，土工格室加筋沥青混合料在高温条件下，更能有效降低路面累计塑性变形，能够更好地延缓路面服役期的累计塑性变形。

Abstract

This study aimed to investigate the creep properties of geocell reinforced asphalt mixtures. With the help of MTS Landmark universal testing machine, the uniaxial penetration creep test was carried out on geocell reinforced asphalt mixtures at room temperature and high temperature under three loading conditions of 1.0, 1.2 and 1.5 MPa for seven different working conditions. Based on the test results, we analyzed the displacement change rule of geocell reinforced double-side layer and three-side layer asphalt mixtures, and used the linear fitting method to accurately deal with the time-displacement relationship so as to obtain the creep rate of each condition and carried out an in-depth study on the creep performance of geocell reinforced asphalt mixtures. The results show that the creep rate of geocell reinforced asphalt mixtures is much smaller than that of the unreinforced asphalt mixtures, and in the two-sided layer of three specifications of geocell reinforced layer of asphalt mixtures, 200 mm of geocell reinforced asphalt mixtures has the maximum rate of creep, followed by 150 mm and 100 mm. In the case of three layers of geocell reinforced asphalt mixtures, and reinforced position in the middle layer when the creep rate is smaller than in the upper layer, it is recommended that geocell reinforced asphalt mixtures in engineering applications should be placed in the middle layer of reinforced. Room temperature conditions of double-sided layer and three layers of reinforced asphalt mixture creep rate than no chamber are reduced by 28.56% and 50.18%, respectively. The high temperature conditions of the magnitude of the drop is more significant, amounting to 65.34% and 81.92%. Geocell reinforced asphalt mixtures in the high temperature conditions and more effective in reducing the cumulative plastic deformation of the pavement can be a better delay in the service period of the pavement of the cumulative plastic deformation.

关键词

土工格室 / 沥青混合料 / 蠕变速率 / 高温稳定性 / 累计塑性变形

Key words

geocell / asphalt mixture / creep rate / high temperature stability / cumulative plastic deformation

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基金资助

国家自然科学基金资助项目(52278328)

中咨集团科技研发项目(zzkj-2022-06)