厚层水泥稳定碎石基层分层连续施工技术研究

发布时间：2018-04-19 18:58

本文选题：厚层水泥稳定碎石基层 + 路用性能　；参考：《长安大学》2015年硕士论文

【摘要】：水泥稳定碎石基层以其强度高,承载力大,水稳定性好,材料经济易得的优点,成为我国高等级公路基层的主要类型。水泥稳定碎石基层的厚度通常在25~36cm之间,在实际的施工过程中一般是分为两层进行摊铺、碾压,第一层施工结束,养生7天后再进行第二层的施工摊铺碾压。分层压实施工造成的主要问题包括:整体性差,基层易产生损伤,以及上下基层裂缝相互反射以及工期长,增加工程造价。而目前国内开展的厚层水泥稳定碎石基层整体摊铺压实技术需要施工单位专门配置大厚度摊铺机和大激振力压路机,很多施工单位无法满足这一要求。因此,有必要开展对厚层水泥稳定碎石基层分层连续摊铺整体成型技术研究。本课题研究中设计了三种层间状态的成型方式,对其路用性能进行测试及分析,结果表明:层间结合状态的下降导致基层路用性能的下降,与现有分层间断施工工艺相比,厚层水泥稳定碎石基层分层连续摊铺技术能够增强基层层间粘结,进而提高基层使用寿命。此外,利用有限元软件建立路面数值模型,并对路面结构内各层层底拉应力及路表弯沉值进行计算分析,结果表明增强基层层间粘结能够有效降低上基层层底拉应力和路表弯沉值,提高基层使用寿命。对厚层水泥稳定碎石基层施工机械进行选型优化,制定合理的摊铺压实工艺,并通过现场铺筑试验路验证厚层水泥稳定碎石基层分层连续摊铺整体成型技术的可行性,并运用寿命周期费用分析法进行了经济效益分析,分层连续施工工艺能够大大降低建设成本及改建成本,能够大范围推广应用。
[Abstract]:Cement stabilized macadam base has become the main type of high grade highway base in our country because of its advantages of high strength, large bearing capacity, good water stability and easy to obtain material economy. The thickness of cement stabilized macadam base is usually between 25~36cm. In the actual construction process, it is usually divided into two layers for spreading, compacting, the first layer is finished, and the second layer is rolled after 7 days. The main problems caused by stratified compaction include poor integrity, easy damage of base, mutual reflection of cracks between upper and lower base, long construction period, and increasing project cost. At present, the whole spreading compaction technology of thick layer cement stabilized crushed stone base in our country needs to be equipped with large thickness paver and high exciting force roller. Many construction units can not meet this requirement. Therefore, it is necessary to study the integral forming technology of layered continuous spreading of thick-layer cement-stabilized macadam base. In this paper, three kinds of interlayer state molding methods are designed, and the road performance is tested and analyzed. The results show that the decrease of interlayer bonding state leads to the decrease of the road performance of the base course, compared with the existing layering intermittent construction technology. The layering continuous spreading technology of thick cement stabilized macadam base can enhance the bond between the base and improve the service life of the base. In addition, the numerical model of pavement is established by using finite element software, and the tensile stress of each layer of pavement structure and the deflection value of pavement surface are calculated and analyzed. The results show that strengthening interlayer bonding can effectively reduce the bottom tensile stress and the deflection value of the upper base layer and improve the service life of the base course. The construction machinery of thick layer cement stabilized macadam base is selected and optimized, the reasonable spreading compaction technology is established, and the feasibility of layered continuous paving technology of thick layer cement stabilized crushed stone base is verified by field paving test road. The economic benefits are analyzed by using the life-cycle cost analysis method. The layered and continuous construction technology can greatly reduce the cost of construction and reconstruction, and can be widely used.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

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