本文選題：低等級(jí)公路　切入點(diǎn)：碾壓混凝土路面　出處：《重慶交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：碾壓混凝土是一種低水膠比、低收縮、高抗折強(qiáng)度,施工時(shí)需要振動(dòng)碾壓成型的混凝土。其主要特點(diǎn)是節(jié)約水泥、施工速度快,而且不需要模板,造價(jià)低等,因此,碾壓混凝土適合修筑低等級(jí)公路路面。合理的路面結(jié)構(gòu)是保證道路路面耐久性的重要保證。本文依托四川省蒼溪縣科技項(xiàng)目《農(nóng)村公路碾壓混凝土路面研究》,對(duì)低等級(jí)公路碾壓混凝土路面結(jié)構(gòu)進(jìn)行研究。 采用有限元方法,建立低等級(jí)公路碾壓混凝土路面荷載應(yīng)力模型和溫度應(yīng)力模型,應(yīng)用Midas FEA三維有限元軟件模擬道路受到的車(chē)輛荷載和溫度應(yīng)力,分析面層厚度、面層模量、基層模量、基層厚度和土基模量等對(duì)溫度應(yīng)力和荷載應(yīng)力的影響規(guī)律。通過(guò)極差分析方法,得到各個(gè)設(shè)計(jì)參數(shù)對(duì)荷載應(yīng)力和溫度應(yīng)力影響的大小,提出碾壓混凝土路面荷載應(yīng)力和溫度應(yīng)力計(jì)算公式。在路面應(yīng)力分析的基礎(chǔ)之上選擇不同的基層形式,分別計(jì)算分析設(shè)計(jì)參數(shù)對(duì)面層厚度的影響。根據(jù)低等級(jí)公路修筑時(shí)就地取材的原則,分別設(shè)計(jì)在中、輕交通量下,以級(jí)配碎石和水泥穩(wěn)定碎石為基層的兩種低等級(jí)公路碾壓混凝土路面典型結(jié)構(gòu)。結(jié)合低等級(jí)公路的路面結(jié)構(gòu)特點(diǎn),從碾壓混凝土材料特性出發(fā),重點(diǎn)研究碾壓混凝土抗折強(qiáng)度、抗折彈性模量和干縮性能對(duì)路面結(jié)構(gòu)設(shè)計(jì)的影響。 研究砂率和單位體積用水量對(duì)碾壓混凝土稠度的影響,提出路面碾壓混凝土施工工藝和需要注意的問(wèn)題。同時(shí)研究碾壓混凝土施工關(guān)鍵技術(shù),包括：碾壓混凝土工作性的控制、平整度的控制、施工縫的處理以及路面養(yǎng)生和開(kāi)放交通的問(wèn)題,以便為碾壓混凝土路面的施工提供參考。
[Abstract]:Roller compacted concrete (RCC) is a kind of concrete with low water-binder ratio, low shrinkage, high flexural strength and needs vibration compaction during construction. Its main characteristics are cement saving, fast construction speed, no need of formwork, low cost, etc. Roller compacted concrete is suitable for the construction of low grade highway pavement. Reasonable pavement structure is an important guarantee to ensure the durability of road pavement. This paper relies on the scientific and technological project of Cangxi County, Sichuan Province, "Research on RCC pavement of Rural Highway". The structure of roller compacted concrete pavement of low grade highway is studied. Using finite element method, the load stress model and temperature stress model of low grade highway RCC pavement are established. The vehicle load and temperature stress on road are simulated by Midas FEA 3D finite element software, and the thickness and modulus of surface layer are analyzed. The influence of the basic modulus, the thickness of the base and the modulus of the soil foundation on the temperature stress and the load stress is obtained. By means of the range analysis method, the magnitude of the influence of each design parameter on the load stress and the temperature stress is obtained. The formulas for calculating load stress and temperature stress of roller compacted concrete pavement are put forward. Calculate and analyze the influence of the design parameters on the thickness of the opposite layer respectively. According to the principle of using local materials in the construction of the low-grade highway, the design is designed separately under the medium and light traffic volume, Based on graded crushed stone and cement stabilized macadam, two typical structures of low grade highway roller compacted concrete pavement are presented. Based on the pavement structure characteristics of low grade highway, the flexural strength of roller compacted concrete is studied emphatically from the characteristics of roller compacted concrete material. The influence of flexural modulus and dry shrinkage on pavement structure design. This paper studies the influence of sand ratio and water consumption per unit volume on the consistency of RCC, puts forward the construction technology and problems needing attention of RCC, and studies the key technology of RCC construction. It includes the control of roller compacted concrete workability, the control of smoothness, the treatment of construction joints, the maintenance of road surface and the open traffic, so as to provide reference for the construction of roller compacted concrete pavement.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U416.216

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