本文關鍵詞：大體積混凝土溫度裂縫控制機理與應用方法研究　出處：《西安建筑科技大學》2013年博士論文　論文類型：學位論文

  更多相關文章： 大體積混凝土 溫度裂縫控制 “抗—放”結合 彈性滑動模型 溫度場差分法 計算模型 鋁塑管 乳化瀝青 柔性釋放縫

【摘要】：大體積混凝土溫度裂縫問題一直是工程界長期關注，并致力于迫切解決的重要課題之一。本文在前人工作基礎上，從理論和應用兩個角度出發(fā)，對大體積混凝土溫度裂縫控制機理與應用方法進行了深入研究，主要內(nèi)容如下： （1）對大體積混凝土溫度裂縫產(chǎn)生的機理主要從以下幾個方面進行了研究，首先分析了大體積混凝土裂縫控制關鍵因素;然后對溫度應力和約束變形進行了分析研究，總結出大體積混凝土結構在內(nèi)、外約束作用下溫度應力計算公式，闡述了約束對徐變松弛、彈性模量的影響。最后對大體積混凝土結構徐變應力進行了分析，建立了單向應力作用下的應力增量—應變增量關系式。 （2）針對現(xiàn)行《大體積混凝土施工規(guī)范》（GB50496-2009）某些方面存在不足，提出在大體積混凝土配合比優(yōu)化設計時，將一定比例的乳化瀝青混合料摻入到大體積混凝土中作為外加劑，對摻有乳化瀝青、粉煤灰和化學纖維的新型復合式大體積混凝土進行了原材料優(yōu)選和配合比優(yōu)化設計。對新型復合式大體積混凝土立方體抗壓強度、軸心抗壓強度、劈裂抗拉強度、靜力受壓彈性模量、軸向拉伸變形進行了力學性能試驗，得出了一些有價值的結論和建議。 （3）根據(jù)“抗—放”原理，建立了“抗—放”結合彈性滑動模型，并進行了力學分析和計算。針對彈性滑動模型在深部礦井井壁大體積混凝土裂縫控制研究領域存在的一些空缺，分析了深部凍結井壁高性能大體積混凝土的水化性能、溫度狀況和溫度應力情況，構造出高性能大體積混凝土井壁溫度場數(shù)學模型，建立了高性能大體積混凝土井壁變形基本微分方程，并將高性能大體積混凝土井壁裂縫控制新技術應用到工程實踐中，得到了較好的社會效益和經(jīng)濟效益。 （4）大體積混凝土溫度場屬于不穩(wěn)定溫度場。由于大體積混凝土澆筑層方向尺寸遠小于水平方向尺寸，只有在厚度方向才能表現(xiàn)傳熱，大體積混凝土比較適合采用差分法進行計算;通過分析大體積混凝土熱傳導原理及熱傳導方程的邊界條件，建立了大體積混凝土一維溫度場有限差分法的計算模型，并結合具體工程進行了一維溫度場有限差分法計算。 （5）針對傳統(tǒng)大體積混凝土溫度裂縫控制中所使用冷凝管存在一些問題，結合“抗—放”原理，根據(jù)鋁塑管特點，對埋設鋁塑管的大體積混凝土裂縫控制方面的關鍵技術進行了系統(tǒng)研究。主要有鋁塑管作為冷卻水管的設計要求，鋁塑管作為冷凝管時混凝土流變模型的建立，，在溫度應力作用下，大體積混凝土中鋁塑管的應力應變關系，并對施工中鋁塑管抗浮問題進行了分析驗算。 （6）分析了大體積混凝土溫度裂縫控制采用變形縫的不足，提出了在大體積混凝土內(nèi)部埋設鋁塑管作為內(nèi)部變形管道，起到了控制溫度裂縫和保證大體積混凝土結構整體性的雙重作用。針對大體積混凝土中埋設鋁塑管可能導致截面削弱等問題，對埋設鋁塑管垂直方向、順著鋁塑管方向的大體積混凝土進行了等效慣性矩和等效寬度計算，對鋁塑管柔性釋放縫變位進行了分析，計算出鋁塑管通過變形吸收的應變能，研究了鋁塑管與混凝土之間變形能量耗散問題，得出了一些可供參考的結論和建議。
[Abstract]:The problem of large - volume concrete temperature crack has been a long - term concern of the engineering community and is one of the most important tasks to solve urgently . In this paper , based on the previous work , this paper studies the mechanism and application method of temperature crack in large volume concrete from two angles : theory and application . The main contents are as follows : ( 1 ) The mechanism of large - volume concrete temperature crack is studied mainly from the following aspects : firstly , the key factors of large - volume concrete crack control are analyzed ; then , the temperature stress and the constraint deformation are analyzed and studied , and the influence of the constraint on creep relaxation and elastic modulus is summarized . Finally , the creep stress of the large - volume concrete structure is analyzed , and the stress increment - strain increment relation under one - way stress is established . ( 2 ) In view of the deficiencies in some aspects of the existing large - volume concrete construction specifications ( GB50496 - 2009 ) , it is proposed that a certain proportion of emulsified asphalt mixture is incorporated into the large - volume concrete as an admixture in the design of large - volume concrete mix ratio optimization . The optimum design of raw materials and mix ratio is carried out for the novel composite large - volume concrete mixed with emulsified asphalt , fly ash and chemical fiber . The mechanical property test is carried out on the compressive strength , axial compressive strength , splitting tensile strength , static pressure compression modulus and axial tensile deformation of the novel composite large - volume concrete cube , and some valuable conclusions and recommendations are obtained . ( 3 ) According to the principle of " anti - caving " , the elastic sliding model of " anti - caving " is established , and the mechanics analysis and calculation are carried out . For the elastic sliding model , the hydration performance , temperature condition and temperature stress condition of high - performance large - volume concrete in deep well wall are analyzed . The mathematical model of temperature field of high - performance large - volume concrete well wall is analyzed . The basic differential equation of high - performance large - volume concrete well wall deformation is constructed . The new technology is applied to engineering practice for controlling the crack control of high - performance large - volume concrete well wall . ( 4 ) The temperature field of large volume concrete belongs to the unstable temperature field . Because the dimension of large volume concrete pouring layer is much smaller than horizontal dimension , heat transfer can only be carried out in the thickness direction , the comparison of large volume concrete is suitable for calculation by means of differential method , and the calculation model of one - dimensional temperature field finite difference method of large volume concrete is established by analyzing the heat conduction principle of large volume concrete and the boundary condition of heat conduction equation , and the finite difference method of one - dimensional temperature field is calculated in combination with the specific engineering . ( 5 ) According to the characteristics of aluminum plastic pipe , the key technology of large volume concrete crack control in large volume concrete is systematically studied according to the characteristics of aluminum plastic pipe . The stress and strain relation of aluminum plastic pipe in large volume concrete under the action of temperature stress is analyzed . ( 6 ) In this paper , the deficiency of temperature crack control with large volume concrete is analyzed , and the double effect of embedding aluminum plastic pipe in large volume concrete as internal deformation pipeline is put forward . The equivalent moment of inertia and equivalent width are calculated for large volume concrete embedded in large volume concrete , and equivalent moment of inertia and equivalent width are calculated for the large volume concrete embedded in the aluminum plastic pipe . The displacement of flexible releasing seam of aluminum plastic pipe is analyzed . The energy dissipation problem of deformation energy between aluminum plastic pipe and concrete is calculated . Some conclusions and suggestions are obtained .

【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU755.7

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