本文選題：碾壓混凝土壩 + 施工參數　； 參考：《天津大學》2014年碩士論文

【摘要】：控制好碾壓混凝土(RCC)壓實質量是確保大壩結構安全的關鍵。適應現場情況變化的施工工藝(參數)的控制準則可為碾壓混凝土壩的實際施工質量控制提供依據。當前對RCC施工工藝和各施工參數的控制主要依據現有規(guī)范、工程經驗及現場碾壓試驗等,缺少實際施工多變情況下多個施工參數、壩料特性對RCC壓實質量的綜合影響的分析,也沒有能實時反映層內、層間壓實質量的適應現場情況多變的綜合性施工控制準則。研究并建立能體現眾多施工參數綜合作用的RCC壓實質量實時控制指標及其控制準則,對于確保RCC施工質量具有重要意義。本文的主要內容及研究成果如下:(1)開展了小型碾壓機壓實試驗,探究了碾壓過程中碾壓混凝土體內顆粒加速度變化規(guī)律及碾壓表面沉降變化規(guī)律,分析了碾壓混凝土的壓實機理,并據此得到了基于顆粒加速度變化及沉降量變化的碾壓混凝土壓實狀態(tài)判定標準。(2)分析了各碾壓參數對碾壓混凝土壓實效果的影響,提出了綜合各碾壓參數的壓實質量綜合控制指標——單位壓實功。針對RCC層內(本體)的壓實質量控制,提出了單位體積壓實功指標,分析了本體壓實質量與單位體積壓實功的關系,得到了單位體積壓實功的控制準則,并在分析試驗相似率的基礎上提出了適合大型碾壓機現場施工的實時控制準則;針對RCC層間結合面的壓實質量控制,提出了層面單位面積壓實功指標,通過分析到達層面處的單位面積壓實功與層間壓實質量的關系,得到了層面單位面積壓實功的施工實時控制準則。(3)開展了振動壓實成型機壓實試驗,來制作RCC本體及含層面試件。對于本體試件,分析了不同VC值下振動時間(可轉化為壓實功)與試件壓實密度的關系,以及VC值與試件抗壓強度的關系,從而得到了VC值變化對單位壓實功的影響規(guī)律,由此提出了VC值的控制標準及不同VC值下單位壓實功的控制準則。對于含層面試件,分析了層間間隔時間與層面抗剪強度的關系,進而根據層間間隔時間對混凝土初凝及力學強度下降的影響,提出了RCC施工層間間隔時間的控制標準。
[Abstract]:The key to ensure the safety of dam structure is to control the compaction quality of RCC. The control criteria of construction technology (parameters) adapted to the change of site conditions can provide the basis for the actual construction quality control of RCC dams. At present, the control of RCC construction technology and construction parameters is mainly based on the existing specifications, engineering experience and field compaction test, etc., and the analysis of the comprehensive influence of dam material characteristics on the compaction quality of RCC is lacking under the condition of variable construction conditions. There is also no comprehensive construction control criterion which can reflect the quality of interlayer compaction in real time. It is of great significance to study and establish the real-time control index and control criterion of RCC compaction quality which can reflect the comprehensive effect of many construction parameters. It is of great significance to ensure the construction quality of RCC. The main contents and research results of this paper are as follows: (1) the compaction test of small roller compaction machine is carried out, and the law of particle acceleration and the change of surface settlement of roller compacted concrete in the process of rolling compaction are investigated. The compaction mechanism of RCC is analyzed, and based on the change of particle acceleration and settlement, the criterion of determining the compaction state of RCC is obtained, and the influence of each roller compaction parameter on the compaction effect of RCC is analyzed. A comprehensive control index of compaction quality, unit compaction work, is put forward. According to the quality control in RCC layer, the unit volume compaction work index is put forward, the relationship between bulk compaction quality and unit volume compaction work is analyzed, and the control criterion of unit volume compaction work is obtained. Based on the analysis of test similarity rate, a real-time control criterion suitable for the field construction of large rolling mill is put forward, and the compaction work index per unit area of layer is proposed for the compaction quality control of RCC interlayer interface. Based on the analysis of the relationship between the compaction work per unit area and the quality of interlayer compaction, the construction real time control criterion of the compaction work per unit area of the plane is obtained, and the compaction test of the vibratory compaction molding machine is carried out. To make RCC body and the specimen with plane. For the bulk specimen, the relationship between the vibration time (which can be converted to compaction work) and the compaction density of the specimen under different VC values and the relation between VC value and the compressive strength of the specimen are analyzed, and the influence of the variation of VC value on the unit compaction work is obtained. The control standard of VC value and the control criterion of unit compaction work under different VC value are presented. The relationship between interlayer interval time and shear strength is analyzed. According to the influence of interlayer interval time on initial setting and mechanical strength decline of concrete, the control standard of interstory interval time for RCC construction is put forward.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV642.2

【參考文獻】

相關期刊論文 前10條

1 李春敏;劉樹坤;;我國RCC厚層碾壓筑壩技術概述[J];水利水電技術;2012年09期

2 劉東海;李丙揚;崔博;;高碾壓混凝土壩智能碾壓理論研究[J];中國工程科學;2011年12期

3 ;Real-time compaction quality monitoring of high core rockfill dam[J];Science China(Technological Sciences);2011年07期

4 ;Theoretical research on construction quality real-time monitoring and system integration of core rockfill dam[J];Science in China(Series E:Technological Sciences);2009年11期

5 姜福田;;碾壓混凝土壩的層面與影響[J];水利水電技術;2008年02期

6 宋擁軍;肖亮達;;改善碾壓混凝土壩層間結合性能的主要措施[J];湖北水力發(fā)電;2008年01期

7 顧沖時;雷鵬;李云;黃光明;方海挺;;碾壓混凝土壩三維黏彈性分析模型研究[J];巖土工程學報;2007年08期

8 杜三林;;彭水大壩碾壓混凝土現場試驗研究[J];人民長江;2007年02期

9 顧沖時;黃光明;賴道平;;碾壓混凝土壩施工層面變形分析模型[J];應用數學和力學;2007年01期

10 魏日華;孫桂喜;;碾壓混凝土層間結合質量影響因素分析及改進措施[J];吉林水利;2006年S1期

相關會議論文 前1條

1 姜福田;房純綱;;碾壓混凝土的壓實及其質量控制[A];混凝土及預應力混凝土論文集[C];1990年

相關博士學位論文 前1條

1 陳龍;碾壓混凝土壩空間漸變力學特性及安全監(jiān)控模型研究[D];河海大學;2006年

，

本文編號：1801973