路面基层开级配水泥稳定碎石使用性能研究

发布时间：2018-03-28 20:49

本文选题：路面基层　切入点：水泥稳定碎石　出处：《湖南大学》2015年硕士论文

【摘要】：路面水损害是公路早期常见病害之一,快速排出路面结构层内的水分是降低水损害的有效途径,除了地表排水和地下排水外,还可以设置排水基层来加强路面内部排水。开级配水泥稳定碎石作为排水基层材料,以其良好的排水性能,近年来得到了广泛关注,学者们在理论和实践上的研究成果也得到了广泛的应用。本文旨在从理论和试验的角度对开级配水泥稳定碎石材料使用性能进行研究,期望研究成果对实际工程有所帮助。本文首先研究了材料的组成设计,提出了合理的级配以及最佳水泥掺量,以粗开级配和细开级配作为研究对象,引入常规级配作为对比,考虑到工程实际应用中的静力压路机和振动压路机两种施工方式,本文以室内静力压实成型和振动压实成型进行模拟,主要研究内容包括:强度性能、刚度性能、收缩性能、抗冻性能、抗冲刷性能、渗水性能。结果表明:振压成型试件强度、刚度性能要显著大于静压成型;开级配水泥稳定碎石干缩系数是常规级配的1.6倍以上,增加细集料含量可以有效降低干缩系数,但温缩系数会增大,振动成型试件收缩性能要优于静压成型;与常规级配相比,开级配水泥稳定碎石抗冻性能高出10%左右,抗冲刷能力显著增强;静压成型开级配水泥稳定碎石抗冻性能优于振压成型,而在抗冲刷性能上则相反;开级配水泥稳定碎石渗水性能高于常规级配6倍以上,有效空隙率与渗透系数之间具有良好的幂指数关系。分形理论作为新兴学科已经不再局限于数学研究,在土木工程领域的应用也获得了成功,本文将之应用于开级配水泥稳定碎石材料的研究上,从理论和试验入手,研究了级配分形维数的计算方法,以及其与有效空隙率之间的关系,计算了体积分形维数。结果表明:有效空隙率与级配分形维数间具有良好的二次曲线关系,级配分形维数越小,材料排水性能越好。最后,结合湖南省界化垄至茶陵(垄茶)高速公路排水基层试验路段实际工程情况,研究了排水基层的主要设计控制指标,包括设计强度、排水基层厚度、最大渗流时间、排水基层排水系统等。结果表明:试验路段完全满足设计要求,排水基层排水系统与一般边缘排水系统各有优劣。
[Abstract]:Pavement water damage is one of the common diseases in the early stage of highway. It is an effective way to reduce water damage by rapidly discharging the moisture in pavement structure layer, except surface drainage and underground drainage. It is also possible to set up a drainage base to strengthen the internal drainage of the pavement. As a drainage base material, the open graded cement stabilized crushed stone, with its good drainage performance, has received extensive attention in recent years. The research results of scholars in theory and practice have also been widely used. The purpose of this paper is to study the performance of cement-stabilized macadam from the theoretical and experimental point of view. It is expected that the research results will be helpful to the practical engineering. Firstly, the composition design of the material is studied, and the reasonable gradation and the optimum cement content are put forward. The coarse opening gradation and the fine opening gradation are taken as the research objects, and the conventional gradation is introduced as the contrast. Considering the two construction methods of static roller and vibratory roller in practical application, this paper simulates the static compaction and vibration compaction in the laboratory. The main research contents include: strength performance, stiffness performance, shrinkage performance. The results show that the strength and stiffness of the specimen formed by vibration compression are significantly higher than that of static compression molding, and the dry shrinkage coefficient of cement stabilized macadam with open grading is more than 1.6 times that of the conventional grade. Increasing the content of fine aggregate can effectively reduce the dry shrinkage coefficient, but the temperature shrinkage coefficient will increase, the shrinkage property of vibration forming specimen is better than that of static compression molding, and the frost resistance of open graded cement stabilized macadam is about 10% higher than that of conventional gradation. The anti-scour ability of open graded cement stabilized macadam by static pressure molding is better than that by vibratory compression molding, but on the contrary, the permeability of open graded cement stabilized macadam is more than 6 times higher than that of conventional gradation. There is a good exponential relationship between effective porosity and permeability coefficient. As a new subject, fractal theory is no longer limited to mathematical research, and its application in civil engineering has also been successful. In this paper, the method of calculating fractal dimension of gradation and the relationship between fractal dimension and effective voidage are studied, which is applied to the study of open graded cement stabilized macadam material. The volume fractal dimension is calculated. The results show that there is a good conic relationship between effective porosity and gradation fractal dimension. The smaller the fractal dimension of gradation is, the better the drainage performance of the material is. Combined with the actual engineering situation of the experimental section of drainage base of Hunan Province, the main design control indexes of drainage base, including design intensity, thickness of drainage base, maximum seepage time, are studied. The results show that the experimental section completely meets the design requirements, and the drainage base drainage system and the general edge drainage system have their own merits and demerits.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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