复合式沥青路面水泥混凝土基面处理技术研究

发布时间：2018-04-02 23:16

本文选题：复合式　切入点：有限元　出处：《西南交通大学》2017年硕士论文

【摘要】：为确定影响刚柔复合式沥青路面层间结合性能的关键性因素,研究不同接触条件下刚柔层间粘结对复合式沥青路面层间粘结、抗剪切、抗拉性能的影响,结合四川地区(南大梁高速)典型的复合式沥青路面结构组合,对水泥混凝土与沥青面层刚柔结合面进行力学响应分析,采用有限元软件模拟分析,并结合室内静态剪切、疲劳剪切试验等手段进行全面分析。通过对气候环境的调查,对项目实体工程所在地区气候环境有全面的了解,包括气候类型、平均气温、极端气温、太阳辐射量、风速等等,为后续数值模拟温度场研究作铺垫。其次通过有限元软件对路面建立物理模型进行模拟分析,通过改变某一因素的形式进行单一变量研究,得出某一因素的变化对粘结层层间应力的影响。通过对比国内外学者之前的研究成果,评价其研究手段的优劣,通过判断取舍形成自己的一套研究方法;在有限元分析中,独创地采用横观各向同性材料模拟粘结材料,表征复合结构的不连续属性,摒弃了之前很多学者直接忽略对粘结层的模拟,或者全模型以相同的线弹性属性参数近似模拟的不准确性。对不同粘结材料、不同界面处理方式的试件以不同的应力比进行疲劳加载,进行室内疲劳剪切试验得出各种组合的疲劳寿命,用回归分析方法对结果进行统计分析,得出不同界面处理方式对复合式路面性能的影响。研究结果表明:影响层间力学性能的内在因素主要有面层厚度、粘结材料和基面处理方式;外在因素主要有道路曲线半径及超高、环境温度和压实效果等。粘结材料的洒布量有一个最佳用量值,需要根据具体情况标定;过薄的面层不能有效减小层间剪应力,建议面层厚度大于8cm;高温更容易导致复合式沥青路面损坏;道路曲线采用极限半径易导致复合式路面产生水平方向的滑移破坏;凿毛层间界面处理方式具有很好的抗剪抗拉性能。
[Abstract]:In order to determine the key factors affecting the interlayer bonding performance of rigid and flexible composite asphalt pavement, the effect of the bond between rigid and flexible layers on the interlayer bond, shear and tensile properties of composite asphalt pavement under different contact conditions was studied.Combined with the typical composite asphalt pavement structure in Sichuan area (south beam high speed), the mechanical response of the rigid and flexible interface between cement concrete and asphalt surface is analyzed, and the finite element software is used to simulate and analyze, and the static shear is used in the laboratory.Fatigue shear test and other means for comprehensive analysis.Through the investigation of the climate environment, we have a comprehensive understanding of the climate environment in the area where the project is located, including the types of climate, average temperature, extreme temperature, solar radiation, wind speed and so on, which will pave the way for the subsequent numerical simulation of temperature field research.Secondly, the physical model of pavement is simulated by finite element software, and a single variable is studied by changing the form of a certain factor, and the influence of the change of one factor on the stress between layers is obtained.By comparing the previous research results of domestic and foreign scholars, evaluating the merits and demerits of its research methods, forming a set of research methods by judging the trade-off, in the finite element analysis, the transversely isotropic material is used to simulate the adhesive material.To characterize the discontinuous properties of composite structures, many scholars directly ignore the simulation of the bonding layer, or approximate the inaccuracy of the whole model with the same linear elastic properties parameters.The specimens with different bonding materials and different interfacial treatment methods were subjected to fatigue loading with different stress ratios. The fatigue life of various combinations was obtained by indoor fatigue shear tests. The results were statistically analyzed by regression analysis.The effects of different interface treatment methods on the performance of composite pavement are obtained.The results show that the internal factors affecting the mechanical properties of the interlayer are mainly the thickness of the surface layer, the bonding material and the treatment method of the base surface, and the external factors are mainly the radius of the road curve and the ultra-high height, the ambient temperature and the compaction effect and so on.There is an optimum amount of the adhesive material sprinkler, which needs to be calibrated according to the specific situation. The thin surface layer can not effectively reduce the interlayer shear stress, and the thickness of the surface layer should be more than 8 cm, and the high temperature will easily lead to the damage of the composite asphalt pavement.The limit radius of road curve can easily lead to horizontal slip failure of composite pavement, and the interfacial treatment of hair-cutting interlayer has good shear and tensile properties.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.2

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