本文選題：澆筑式瀝青混凝土 + 碾壓式瀝青混凝土��； 參考：《新疆農(nóng)業(yè)大學》2016年碩士論文

【摘要】：采用瀝青混凝土心墻作為當?shù)夭牧蠅蔚姆罎B體系經(jīng)過一系列的世界范圍內建設發(fā)展,成為很有應用前景的一種壩型。它具有一定的強度、良好的適應變形能力、低的透水性、抗沖蝕能力和抗老化能力,且可以在任何惡劣環(huán)境下和任何海拔高度使用。大量工程實踐均表明此種壩型具有很好的易施工性及穩(wěn)定性,可以廣泛的應用,但到目前為止,每一個工程都要花費大量時間進行配合比試驗,其大壩設計評價及建設也是經(jīng)驗性的,因而限制了該壩型的發(fā)展。通過采用有限元軟件研究不同施工方式組成的瀝青混凝土心墻其應力應變規(guī)律,對于以后工程設計具有重要意義。本文主要結論如下:1.總結了國內外的澆筑式及碾壓式瀝青混凝土的物理力學工程特性,實踐證明應用這些指標的工程性狀良好,則當工程規(guī)模較小的時候,可不做配合比試驗,直接選用類似工程的指標用于工程建設,減少時間和造價。2.通過數(shù)值模擬,對比研究澆筑式和碾壓式瀝青混凝土,對心墻的應力應變特性影響;同時研究了壩殼料與心墻之間的相互作用對其應力應變性狀的影響。結果表明:當壩殼填筑料相同,而心墻分別采用不同施工方式的澆筑式或碾壓式瀝青混凝土時,大壩及心墻的應力應變性態(tài)基本相同;當采用不同壩殼材料,而相同的心墻瀝青混凝土材料時,大壩的應力應變性態(tài)差異較大,明顯的受控于壩殼料性狀。這表明瀝青混凝土心墻并不是受力構件,僅僅只為防滲體,采用何種類型瀝青混凝土均不影響心墻的應力應變狀態(tài)。也證明采用澆筑式的心墻和碾壓式相同,均可修建高瀝青混凝土心墻壩。3.通過有限元分析對瀝青混凝土心墻與過渡層相互作用的研究,明確了過渡層的結構尺度和材料性能對心墻應力應變性狀的影響,結果表明:不論是單層還是雙層過渡層,其性質和幾何尺度對瀝青混凝土心墻性態(tài)影響不大,因而可以簡化過渡層結構,為過渡層設計提供了定量的設計依據(jù)。4.提出組合式瀝青混凝土心墻壩的設計方案,并通過有限元分析,對比其與澆筑式及碾壓式瀝青混凝土心墻壩的應力應變特性同異,證明組合式心墻方案是可行的,不失為一種性能安全可靠、滿足快速施工的經(jīng)濟壩型。
[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.
【學位授予單位】：新疆農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TV544

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本文編號：1995900