沥青混凝土心墙坝应力变形及水力劈裂研究
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摘要
采用三维非线性有限元法对新疆某沥青混凝土心墙堆石坝进行了应力变形分析,计算中采用邓肯E-B模型作为坝体及心墙的本构模型,对大坝施工和蓄水过程进行了模拟,并采用线弹性断裂力学方法对沥青混凝土心墙是否会发生水力劈裂破坏进行了判定分析。计算结果表明,坝体和心墙应力变形均处在合理范围之内,但心墙中存在一定的拱效应,需要研究其发生水力劈裂的风险。基于线弹性断裂力学理论建立了沥青混凝土心墙水力劈裂判定准则,并在可能开裂处预设裂纹进行水力劈裂判定,结果表明,该裂纹尚不能扩展,沥青混凝土心墙不会发生水力劈裂破坏。
In order to study the static characteristics of rockfill dam with asphalt concrete core in Xinjiang Province, the nonlinear three-dimensional finite element method was employed. The Duncan-Chang E-B model was chosen in this paper to simulate the filling and storing processes of the dam. Based on the theory of linear-elastic fracture mechanics, the hydraulic fracturing analysis of asphalt concrete core is performed. According to the analysis results, the stress intensities and deformation values were within safety ranges, but the asphalt concrete core wall has obvious arching effect. So we need to study the risk of hydraulic fracturing on core. The hydraulically fracturing criterion of the core is established on the based of the fracture mechanics theory, and the probability of hydraulic fracturing on core can be obtained by pre-defined fracture in the possible position. The analysis shows that the fracture could not propagate, local hydraulic fracturing couldn't occur.
In order to study the static characteristics of rockfill dam with asphalt concrete core in Xinjiang Province, the nonlinear three-dimensional finite element method was employed. The Duncan-Chang E-B model was chosen in this paper to simulate the filling and storing processes of the dam. Based on the theory of linear-elastic fracture mechanics, the hydraulic fracturing analysis of asphalt concrete core is performed. According to the analysis results, the stress intensities and deformation values were within safety ranges, but the asphalt concrete core wall has obvious arching effect. So we need to study the risk of hydraulic fracturing on core. The hydraulically fracturing criterion of the core is established on the based of the fracture mechanics theory, and the probability of hydraulic fracturing on core can be obtained by pre-defined fracture in the possible position. The analysis shows that the fracture could not propagate, local hydraulic fracturing couldn't occur.
引文
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[2]WANG Wei-biao,Hoeg K.The asphalt core embankment dam:a very competitive alternative[C]//Modern Rockfill Dams-2009.Beijing:China Water PowerPress,2009.
[3]周欣华,铙锡保,朱国胜.沥青混凝土心墙堆石坝产生水力劈裂破坏的分析与评价[C]//第二届全国岩土与工程学术大会论文集(上册).武汉:科技出版社,2006:621-626.ZHOU Xinhua,RAO Xibao,ZHU Guosheng.The core-wall rock-fill dam of bituminous concrete produced water conservancy and split off the analysis and appraisal that is destroyed[C]//The 2nd National Geotechnical and Engineering Academic Congress Symposium(up volume).Wuhan:Science and Technology Press,2006:621-626.(in Chinese)
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[8]毛成,邱延峻.沥青混凝土复合型裂纹扩展行为数值模拟[J].公路交通科技,2006,(10):20-24.MAO Cheng,QIUYanjun.Numerical simulation of compound crack propagation behavior of asphalt concrete[J],Journal of Highway and Transportation Research and Development,2006,(10):20-24.(in Chinese)
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[10]Duncan J M,Chang Chin-yung.Nonlinear analysis of stress and strain in soils[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1970,96(5):1629-1653.
[11]杜治华,李友华.沥青混凝土心墙的变形特性与施工控制[J].中国三峡建设2000,(11):22-23.DU Zhi-hua,LI Yu-hua.Deformation and control of asphalt concrete core wall[J].China Three Gorges Construction,2000,(11):22-23.(in Chinese)
[12]王端宜,刘敬辉,刘宇.沥青混合料粘弹塑性断裂参数的研究[J].华南理工大学学报(自然科学版),2009,(11):7-11.Wang Duan-yi,Liu Jing-hui,Liu Yu.Investigation into viscoelastic-plastic fracture parameters of asphalt mixture[J].Journal of South China University of Technology(Natural Science Edition),2009(11):7-11.(in Chinese)
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[2]WANG Wei-biao,Hoeg K.The asphalt core embankment dam:a very competitive alternative[C]//Modern Rockfill Dams-2009.Beijing:China Water PowerPress,2009.
[3]周欣华,铙锡保,朱国胜.沥青混凝土心墙堆石坝产生水力劈裂破坏的分析与评价[C]//第二届全国岩土与工程学术大会论文集(上册).武汉:科技出版社,2006:621-626.ZHOU Xinhua,RAO Xibao,ZHU Guosheng.The core-wall rock-fill dam of bituminous concrete produced water conservancy and split off the analysis and appraisal that is destroyed[C]//The 2nd National Geotechnical and Engineering Academic Congress Symposium(up volume).Wuhan:Science and Technology Press,2006:621-626.(in Chinese)
[4]张丙印,李全明,熊焰,等.三峡茅坪溪沥青混凝土心墙堆石坝应力变形分析[J].长江科学院院报,2004,21(2):18-21.ZHANG Bing-yin,LI Quan-ming,XIONG Yan,et al.Numerical study on Maopingxirockfilldam with asphalt concrete core in Three Gorges Project[J].Journal of Yangtze River Scientific Research Institute,2004,21(2):18-21.(in Chinese)
[5]Feizi-Khankandi S,Fhalandarzadeh A,Mirghasemi A A,etal.Seismic analysis of the Garmrood embankment dam with asphalt concrete core[J].Soil sand Foundations,2009,49(2):153-166.
[6]中华人民共和国水利部.SLJ01-88.土石坝沥青混凝土面板和心墙设计准则[S].北京:中国水利水电出版社,2010.The Ministry of Water Resources of the People's Republic of China.SLJ01-88.Earth-Rock Dam Asphalt Concrete Panel and Core Wall Design Criteria[S].Beijing:China Water&Power Press,2010.(in Chinese)
[7]王俊杰,朱俊高,张辉.关于土石坝心墙水力劈裂研究的一些思考[J].岩土力学与工程学报,2005,(24);5664-5668.WANG Jun-jie,ZHU Jun-gao,ZHANG Hui.Some ideas of study on hydraulic fracturing of core of earth-rockfilldam[J],Chinese Journal of Rock Mechanics and Engineering,,2005(24);5664-5668.(in Chinese)
[8]毛成,邱延峻.沥青混凝土复合型裂纹扩展行为数值模拟[J].公路交通科技,2006,(10):20-24.MAO Cheng,QIUYanjun.Numerical simulation of compound crack propagation behavior of asphalt concrete[J],Journal of Highway and Transportation Research and Development,2006,(10):20-24.(in Chinese)
[9]屈漫利.水工沥青混凝土抗裂性能和试件成型方法的试验研究[D].西安:西安理工大学,2001.QU Man-li.The testing researches of the crack-resistant and specimen forming methods of hydraulic asphalt concrete[D].Xi'an University of Technology,2001.(in Chinese)
[10]Duncan J M,Chang Chin-yung.Nonlinear analysis of stress and strain in soils[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1970,96(5):1629-1653.
[11]杜治华,李友华.沥青混凝土心墙的变形特性与施工控制[J].中国三峡建设2000,(11):22-23.DU Zhi-hua,LI Yu-hua.Deformation and control of asphalt concrete core wall[J].China Three Gorges Construction,2000,(11):22-23.(in Chinese)
[12]王端宜,刘敬辉,刘宇.沥青混合料粘弹塑性断裂参数的研究[J].华南理工大学学报(自然科学版),2009,(11):7-11.Wang Duan-yi,Liu Jing-hui,Liu Yu.Investigation into viscoelastic-plastic fracture parameters of asphalt mixture[J].Journal of South China University of Technology(Natural Science Edition),2009(11):7-11.(in Chinese)
[13]营原照雄(日).沥青混合料力学性能研究论文集[M].张肖宁,译.哈尔滨:哈尔滨建筑工程出版社,1982.Teruo Sugawara(Japanese).Study of asphalt-mixture mechanical performance symposium[M].Translated by Xiao-ning Zhang.Harbin:Harbin Building Engineering Press,1982.