浇筑式、碾压式与组合式沥青混凝土心墙特性研究

发布时间：2018-06-08 13:10

本文选题：浇筑式沥青混凝土 + 碾压式沥青混凝土　；参考：《新疆农业大学》2016年硕士论文

【摘要】：采用沥青混凝土心墙作为当地材料坝的防渗体系经过一系列的世界范围内建设发展,成为很有应用前景的一种坝型。它具有一定的强度、良好的适应变形能力、低的透水性、抗冲蚀能力和抗老化能力,且可以在任何恶劣环境下和任何海拔高度使用。大量工程实践均表明此种坝型具有很好的易施工性及稳定性,可以广泛的应用,但到目前为止,每一个工程都要花费大量时间进行配合比试验,其大坝设计评价及建设也是经验性的,因而限制了该坝型的发展。通过采用有限元软件研究不同施工方式组成的沥青混凝土心墙其应力应变规律,对于以后工程设计具有重要意义。本文主要结论如下:1.总结了国内外的浇筑式及碾压式沥青混凝土的物理力学工程特性,实践证明应用这些指标的工程性状良好,则当工程规模较小的时候,可不做配合比试验,直接选用类似工程的指标用于工程建设,减少时间和造价。2.通过数值模拟,对比研究浇筑式和碾压式沥青混凝土,对心墙的应力应变特性影响;同时研究了坝壳料与心墙之间的相互作用对其应力应变性状的影响。结果表明:当坝壳填筑料相同,而心墙分别采用不同施工方式的浇筑式或碾压式沥青混凝土时,大坝及心墙的应力应变性态基本相同;当采用不同坝壳材料,而相同的心墙沥青混凝土材料时,大坝的应力应变性态差异较大,明显的受控于坝壳料性状。这表明沥青混凝土心墙并不是受力构件,仅仅只为防渗体,采用何种类型沥青混凝土均不影响心墙的应力应变状态。也证明采用浇筑式的心墙和碾压式相同,均可修建高沥青混凝土心墙坝。3.通过有限元分析对沥青混凝土心墙与过渡层相互作用的研究,明确了过渡层的结构尺度和材料性能对心墙应力应变性状的影响,结果表明:不论是单层还是双层过渡层,其性质和几何尺度对沥青混凝土心墙性态影响不大,因而可以简化过渡层结构,为过渡层设计提供了定量的设计依据。4.提出组合式沥青混凝土心墙坝的设计方案,并通过有限元分析,对比其与浇筑式及碾压式沥青混凝土心墙坝的应力应变特性同异,证明组合式心墙方案是可行的,不失为一种性能安全可靠、满足快速施工的经济坝型。
[Abstract]:Using asphalt concrete core wall as the seepage control system of local material dam has become a kind of dam type with great application prospect after a series of worldwide construction and development. It has a certain strength, good adaptability to deformation, low water permeability, erosion resistance and aging resistance, and can be used in any harsh environment or at any altitude. A large number of engineering practices show that the dam type is easy to construct and stable and can be widely used. However, up to now, every project has to spend a lot of time on the mix ratio test. The dam design evaluation and construction are also empirical, which limits the development of the dam type. By using finite element software to study the stress-strain law of asphalt concrete core wall made up of different construction methods, it is of great significance for future engineering design. The main conclusions of this paper are as follows: 1. The physical and mechanical engineering characteristics of pouring and roller compacted asphalt concrete at home and abroad are summarized. It is proved by practice that the engineering properties of these indexes are good, and when the scale of the project is small, the mix ratio test can be avoided. Direct selection of similar engineering indicators for engineering construction, reducing time and cost. 2. 2. Through numerical simulation, the effects of pouring type asphalt concrete and roller compacted asphalt concrete on the stress-strain characteristics of the core wall and the influence of the interaction between the dam shell material and the core wall on the stress-strain behavior are studied. The results show that the stress denaturation of the dam and core wall is basically the same when the dam shell filling material is the same and the core wall is constructed with different construction methods or roller compacted asphalt concrete, and when different dam shell materials are used, the stress behavior of the dam and core wall is basically the same. For the same asphalt concrete with the same core wall, the stress denaturation of the dam is different greatly, which is obviously controlled by the characteristics of the shell material. This indicates that the asphalt concrete core wall is not a force member, but only an impervious body, and what type of asphalt concrete is used does not affect the stress and strain state of the core wall. It is also proved that the high asphalt concrete core dam. 3 can be built with the same pouring core wall and roller compaction type. Through the finite element analysis of the interaction between the asphalt concrete core wall and the transition layer, the influence of the structure scale and the material performance of the transition layer on the stress and strain behavior of the core wall is clarified. The results show that the transition layer is single layer or double layer transition layer. Its properties and geometric scale have little influence on the behavior of asphalt concrete core wall, so it can simplify the structure of transition layer and provide a quantitative design basis for the design of transition layer. The design scheme of composite asphalt concrete core wall dam is put forward. Through finite element analysis, the stress and strain characteristics of composite asphalt concrete core dam are compared with those of pouring type and roller compacted type asphalt concrete core dam. It is proved that the combined core wall scheme is feasible. It is a kind of safe and reliable performance and meets the economic dam type of rapid construction.
【学位授予单位】：新疆农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV544

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