埋設(shè)鋁塑管的大體積混凝土裂縫控制機理與力學(xué)性能研究*
江昔平1,2,劉洋1,劉陽1,王玲娟1
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江昔平1,2,劉洋1,劉陽1,王玲娟1(1 安徽理工大學(xué)土木建筑學(xué)院, 淮南 232001; 2 西安建筑科技大學(xué)土木學(xué)院, 西安 710055)[摘要]針對大體積混凝土溫度裂縫控制中使用傳統(tǒng)冷凝管存在的一些問題,結(jié)合鋁塑管自身的優(yōu)良特性,分析了鋁塑管控制大體積混凝土溫度裂縫的機理。對鋁塑管作為冷凝管時,管徑選擇、通水要求、管路布置、設(shè)計要求等關(guān)鍵技術(shù)問題進行了深入探討。對埋設(shè)鋁塑管的大體積混凝土力學(xué)性能進行系統(tǒng)研究,主要包括:在溫度應(yīng)力作用下,大體積混凝土中鋁塑管應(yīng)力、應(yīng)變問題;大體積混凝土結(jié)構(gòu)等效慣性矩、等效寬度的計算問題;施工中鋁塑管抗浮問題。研究結(jié)果表明:充分利用鋁塑管導(dǎo)熱系數(shù)小、柔性變形的特點,一方面控制了大體積混凝土內(nèi)部水化熱,另一方面通過鋁塑管的變形,使大體積混凝土所產(chǎn)生的約束應(yīng)力得到足夠的釋放,很好地解決了大體積混凝土溫度裂縫問題。[關(guān)鍵詞]鋁塑管; 大體積混凝土; 柔性變形; 力學(xué)性能; 控制機理中圖分類號:TU47文獻標(biāo)識碼:A文章編號:1002-848X(2013)13-0067-04Crack control mechanism and mechanical properties of mass concrete with buried aluminum plastic pipesJiang Xiping1,2, Liu Yang1, Liu Yang1, Wang Lingjuan1(1 School of Civil Engineering, Anhui University of Science and Technology, Huainan 232001, China; 2 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)Abstract: Based on existed problems in using traditional condenser pipes to control temperature cracks of mass concrete and excellent properties of aluminum plastic pipes, the mechanism of using aluminum plastic pipe to control mass concrete temperature cracks was analyzed. The key technologies of diameter selection, requirements of cooling water, pipeline layouts and design requirements of aluminum plastic pipes were further discussed when used as condenser pipes. Mechanical properties of mass concrete with buried aluminum plastic pipes were systematically designed. These properties are mainly focus on the following aspects: the strain and stress of aluminum plastic pipes in mass concrete under temperature stress impact; equivalent inertia moment and equivalent width calculation problems of mass concrete structure; anti-floating design of aluminum plastic pipes in construction. Results show that making full use of the characteristics of low thermal conductivity and flexible deformation of aluminum plastic pipes can control internal hydration heat in mass concrete; on the other hand, constraint stress generated by mass concrete is sufficiently released through deformation of aluminum plastic pipes. This method solves temperature cracks problem of mass concrete well.Keywords: aluminum plastic pipe; mass concrete; flexible deformation; mechanical property; control mechanism*住房和城鄉(xiāng)建設(shè)部科研項目(2011-K4-28),安徽省建設(shè)行業(yè)科研項目(2011-YF-38),安徽省教育廳科研項目(KJ2011Z110),淮南市科技局科研項目(2011A07907)。作者簡介:江昔平,博士,副教授,Email:820225501@qq.com。參考文獻[1]朱伯芳.大體積混凝土溫度應(yīng)力與溫度控制[M].北京:中國電力出版社,1999.[2]江昔平.大體積混凝土溫度裂縫控制機理與應(yīng)用方法研究[D].西安:西安建筑科技大學(xué),2012.[3]王鐵夢.工程結(jié)構(gòu)裂縫控制[M].北京:中國建筑工業(yè)出版社,2004.[4]劉紅雷.鋁塑復(fù)合管施工方法和技術(shù)要求[J].中國新技術(shù)新產(chǎn)品,2011,23:62.[5]王希林.鋁塑管在高層住宅中應(yīng)用[J].施工技術(shù),2000,29(2):57-58.[6]王沖,蒲心誠.超高強大體積混凝土的水化溫升及溫差測試[J].重慶大學(xué)學(xué)報:自然科學(xué)版,2008, 31(1):17-21.[7]宋玉普,王懷亮.全級配大體積混凝土的內(nèi)時損傷本構(gòu)模型[J].水利學(xué)報,2006(7):769-777.[8]朱伯芳.大體積混凝土絕熱溫升試驗新方法[J].水利水電技術(shù), 2010, 41(3):37-39.[9]劉杏紅,周創(chuàng)兵,常曉林,等.大體積混凝土溫度裂縫擴展過程模擬[J].巖土力學(xué),2010, 31(8):2666-2676.