本文選題：土石壩 + 瀝青混凝土心墻　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：本文利用新研制的設(shè)備,探索了一種從傳統(tǒng)碾壓式瀝青混凝土心墻施工中改進(jìn)而來的新瀝青心墻施工工藝——骨料排列導(dǎo)向工藝在室內(nèi)條件下的可行性,為日后將此工藝運用于實際工程中打下基礎(chǔ)。瀝青混凝土中所用的骨料為不規(guī)則的多邊形,其力學(xué)性能具有各向異性,而在瀝責(zé)心墻的施工中,這些不規(guī)則的骨料被隨機(jī)排列,本文所研究的導(dǎo)向工藝正是利用這一特性,通過在傳統(tǒng)施工的攤鋪與碾壓過程之間增加一個導(dǎo)向過程,對自然排列的骨料進(jìn)行導(dǎo)向,使其排列的更加具有規(guī)律性,從而使瀝青混凝土更易被壓實,隨之減少碾壓次數(shù)。最終達(dá)到提高瀝青混凝土心墻的施工效率,節(jié)約施工能耗的目的。具體研究內(nèi)容及結(jié)論如下:1.通過試驗探究了導(dǎo)向工藝是否能提高瀝青混凝土的室內(nèi)成型效率,試驗結(jié)果顯示,經(jīng)過一次導(dǎo)向和兩遍擊實所成型的瀝青混凝土,其孔隙率就已經(jīng)達(dá)到了1.99%,滿足規(guī)范所要求的≤3%規(guī)定,而沒有經(jīng)過導(dǎo)向的瀝青混凝土在經(jīng)過四遍擊實后,其孔隙率才達(dá)到2.63%。這說明導(dǎo)向工藝確實能在一定程度上提高瀝青混凝土的成型效率。2.從直接觀察和CT掃描兩個角度探究了導(dǎo)向工藝是否會對瀝青混凝土試件中的骨料排列產(chǎn)生影響.通過試驗,直接觀察和CT掃描兩個角度所得到的試驗結(jié)論基本一致;導(dǎo)向工藝會對瀝青混凝土中的骨料排列產(chǎn)生影響,具體表現(xiàn)為刀片所經(jīng)過的痕跡由粒徑較小的骨料與填料組成,而在痕跡兩側(cè)多為粒徑較大的骨料,且這些骨料都順著刀片行進(jìn)的方向排列。3.通過小梁彎曲試驗、剪切試始、斜坡流消試驗、劈裂試驗四種性能試驗探究了導(dǎo)向工藝是否會對瀝青混凝土的力學(xué)性能產(chǎn)生影響,并得出結(jié)論:導(dǎo)向工藝所導(dǎo)致的骨料排列不會對瀝青混凝土的彎曲性能及劈裂性能產(chǎn)生明顯影響;當(dāng)沒有法向壓力時,導(dǎo)向工藝會對瀝青混凝土的剪切變形能力產(chǎn)生小幅的不良影響,而當(dāng)存在法向壓力時,這種不良影響消失;導(dǎo)向工藝會對瀝青混凝土的斜坡流淌性能產(chǎn)生一定影響,且這種影響會隨著導(dǎo)向面與斜坡的方向關(guān)系的改變而改變。
[Abstract]:In this paper, using the newly developed equipment, the feasibility of a new asphalt core wall construction technology, which is improved from the traditional roller compacted asphalt concrete core wall construction technology, is explored under indoor conditions. It will lay the foundation for the application of this process in practical engineering in the future. The aggregate used in asphalt concrete is irregular polygon, and its mechanical properties are anisotropic. In the construction of the asphalt core wall, these irregular aggregates are arranged randomly. By adding a guiding process between the spreading of traditional construction and the rolling process, the naturally arranged aggregate is guided to make it more regular, so that the asphalt concrete can be compacted more easily, and the rolling times are reduced accordingly. Finally, the construction efficiency of asphalt concrete core wall is improved and energy consumption is saved. The specific contents and conclusions are as follows: 1. Whether the guide technology can improve the indoor forming efficiency of asphalt concrete is explored through the experiment. The test results show that the asphalt concrete formed by one guide and two times compaction can improve the forming efficiency of asphalt concrete. The porosity has reached 1.99, which meets the requirement of 鈮，

本文編號：1834794