基于ANSYS的深覆盖层混凝土面板堆石坝应力变形分析
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摘要
为研究深覆盖层上的混凝土面板堆石坝应力变形特性,以察汗乌苏混凝土面板堆石坝为例,对堆石体采用Duncan Chang E-B本构模型,基于ANSYS软件使用有限元法对大坝进行模拟分析,得到坝体及混凝土面板在3种工况下的应力及位移分布结果。计算结果表明,随库水位增加,坝体大主应力逐渐增大而小主应力逐渐减小; 3种工况下在X向上游坝体发生逆流向横向位移且随库水位增加而减小,下游坝体发生顺流向横向位移且随库水位增加而增大,在Y向坝体均只发生向下的位移变形,随库水位增加变化不大;竣工后面板大主应力主要为压应力且随库水位增加而增大;竣工后面板由于发生横向变形而出现鼓起脱空现象,随库水位增加至正常蓄水位脱空现象逐渐消失,在Y向面板均只发生向下位移变形且随库水位增加而增大。
In order to study the stress-deformation characteristics of concrete face rockfill dams on deep overburdens,a concrete face rockfill dam of Chahanwusu was taken as an example.The Duncan Chang E-B constitutive model was used for rockfills and the dam was simulated and analyzed through the finite element method of ANSYS software.Finally,we got the distribution results of stress and displacement of the dam and concrete panel under three conditions.The calculation results show that:with the increase of reservoir water level,the major principal stress of the dam gradually increases while the minor principal stress gradually decreases; Under the three conditions,the upstream dam on X occurs lateral displacement against the stream and it becomes smaller as the water level increases.Downstream dam occurs lateral displacement in the downstream direction and it becomes bigger as the water level increases.On the Y direction,the dam only undergoes downward displacement and deformation and it does not change much with the increase of the water level of the reservoir.Compressive stress is mainly the major principal stress of the slab after the project is completed and goes stronger as the reservoir water level increases.After the project is completed,the panel will be hollowed out due to the lateral deformation but the phenomenon of voiding disappears as the reservoir water level increases to the normal water level.The panel on Y direction will only occurs the downward displacement and deformation,and the displacement and deformation will be stronger with the increase of reservoir water level.
In order to study the stress-deformation characteristics of concrete face rockfill dams on deep overburdens,a concrete face rockfill dam of Chahanwusu was taken as an example.The Duncan Chang E-B constitutive model was used for rockfills and the dam was simulated and analyzed through the finite element method of ANSYS software.Finally,we got the distribution results of stress and displacement of the dam and concrete panel under three conditions.The calculation results show that:with the increase of reservoir water level,the major principal stress of the dam gradually increases while the minor principal stress gradually decreases; Under the three conditions,the upstream dam on X occurs lateral displacement against the stream and it becomes smaller as the water level increases.Downstream dam occurs lateral displacement in the downstream direction and it becomes bigger as the water level increases.On the Y direction,the dam only undergoes downward displacement and deformation and it does not change much with the increase of the water level of the reservoir.Compressive stress is mainly the major principal stress of the slab after the project is completed and goes stronger as the reservoir water level increases.After the project is completed,the panel will be hollowed out due to the lateral deformation but the phenomenon of voiding disappears as the reservoir water level increases to the normal water level.The panel on Y direction will only occurs the downward displacement and deformation,and the displacement and deformation will be stronger with the increase of reservoir water level.
引文
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[3]郭桢,刘干斌,尹铁锋,等.宁波地区主要土层邓肯—张模型参数试验研究[J].工程勘察,2014,42(4):12-16.
[4]张向伟,李建伟,黎继平,等.基于三轴试验的邓肯张模型参数的确定方法[J].云南水力发电,2012,28(2):67-69.
[5]孙明权,陈姣姣,刘运红.邓肯-张E-B模型的ANSYS二次开发及应用[J].华北水利水电学院学报,2013,34(2):30-34.
[6]李宗坤,何芳婵,王建有,等.基于ANSYS的土石坝施工过程仿真分析[J].人民黄河,2007(8):59-60.
[7]王桔.接触单元法在混凝土心墙土石坝有限元分析中的应用[J].湖南水利水电,2016(5):41-45.
[8]刘云平,包华,洪俊青等. ANSYS的接触分析在钢筋混凝土滑移中的应用[J].南通大学学报:自然科学版,2009,8(2):70-73,90.
[9]董必昌.岩土工程仿真中接触单元和相关参数研究[D].武汉:华中科技大学,2005.
[10]李妍.基于ANSYS软件的接触问题分析及在工程中的应用[D].长春:吉林大学,2004.
[11]常双梅.深覆盖层面板堆石坝应力应变分析[D].兰州:兰州交通大学,2014.
[12]谢国海,章广成,杨昌斌.边坡分级开挖过程的动态模拟[J].土工基础,2007(3):54-56.
[13]孙乃波,陈胜宏.生死单元在拱坝施工仿真分析中的应用[J].水电能源科学,2004(3):65-67.