级配碎石上基层抑制沥青路面反射裂缝研究

发布时间：2018-06-12 12:33

本文选题：级配碎石 + 反射裂缝　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：为了研究级配碎石材料作为柔性上基层在中轻交通荷载作用下的适用性与抑制反射裂缝的能力,依托抚顺宝上线试验路为工程背景,采用室内试验、路面结构理论计算与分析以及试验路现场铺筑与测试的方法,对级配碎石材料的原材料物理力学性质进行检验分析以及对级配碎石材料的回弹模量、CBR值等路用性能进行室内试验研究,再通过HPDS路面计算软件对其路面结构层进行设计与计算、运用FLAC3D数值模拟软件按照设计的结构层对其进行理论分析,为试验路的铺筑提供理论依据。根据所设计的结构层进行试验路铺筑并对级配碎石路段试验路进行原位试验,测试级配碎石材料基层的压实度、回弹模量、CBR值、弯沉值等重要技术指标,最后在试验路正常使用一段时期后,对试验路的平整度以及裂缝情况进行后期观测。通过上述试验与分析可知,级配碎石材料的回弹模量、CBR值、弯沉值等各项技术指标均满足设计指标与公路路基设计规范中对路基材料的要求,并没有出现由于其柔性大、刚度小而导致沥青路面产生过大的变形。这证明了级配碎石材料作为柔性上基层加入到典型半刚性底基层与沥青面层之间的适用性。通过后期观测可知级配碎石路段的路面健康状况比典型半刚性基层沥青面层的结构好很多,从而直观地证明了级配碎石材料防止沥青路面产生反射裂缝的能力。通过经济效益分析可以判断级配碎石材料的经济适用性。综上可知,因为级配碎石材料能够改善典型半刚性基层沥青路面容易产生反射裂缝的现象,因此将级配碎石材料作为柔性上基层的路面结构应该在公路建设中被广泛应用。
[Abstract]:In order to study the applicability of graded macadam as a flexible base course under medium and light traffic loads and its ability to suppress reflective cracks, the indoor test was adopted based on the experimental road of Fushun Bao Line. The theoretical calculation and analysis of pavement structure and the method of laying and testing the test road on the spot, The physical and mechanical properties of graded macadam are tested and analyzed, and the performance of graded macadam, such as modulus of resilience and CBR, is studied in laboratory. Then the pavement structure layer is designed and calculated by HPDS, and the theoretical analysis is carried out by using FLAC3D numerical simulation software according to the designed structure layer, which provides the theoretical basis for paving the test road. According to the designed structure layer, the test road is paved and the test road of graded crushed stone is tested in situ. The compaction degree, modulus of resilience, CBR value, deflection value and other important technical indexes of graded crushed stone base are tested. Finally, after a period of normal use of the test road, the flatness and crack situation of the test road are observed later. Through the above test and analysis, it can be seen that the resilience modulus and CBR value and deflection value of graded macadam meet the requirements of the design index and highway roadbed design code, but do not appear because of its large flexibility. Small stiffness leads to excessive deformation of asphalt pavement. This proves the applicability of graded macadam as a flexible base to the typical semi-rigid base and asphalt surface. Through the later observation, it can be seen that the pavement health condition of graded crushed stone section is much better than that of typical semi-rigid base asphalt surface layer, which directly proves the ability of graded gravel material to prevent reflective cracks on asphalt pavement. The economic applicability of graded macadam can be judged by economic benefit analysis. In summary, because graded crushed stone material can improve the phenomenon of reflection crack in typical semi-rigid base asphalt pavement, gradation gravel material should be widely used in highway construction as the pavement structure of flexible base course.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217

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