混凝土重力坝三维数值模拟及优化设计
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摘要
随着重力坝在工程中的广泛应用及新建重力坝坝高不断增加,其局部坝段的工作状况对大坝的整体运行影响也越来越大,因此选择适合工程实际的重力坝坝型显得尤为重要。通过抗剪断稳定计算和三维数值分析相结合的方法,分析了某重力坝的安全稳定性。计算结果表明,该坝坝肩段出现拉应力,以此对原设计方案进行优化设计,优化后新坝型坝肩段无拉应力出现。原方案与优化方案的对比分析表明:类似工程中,重力坝坝肩段设计应采用坝肩段与主坝段有一定角度或类似于拱坝的形式布设,以减小坝肩拉应力;在同类重力坝安全稳定分析时,可采用抗剪断稳定计算与三维数值模拟相结合的方法;在二维计算满足规范要求时,三维数值模拟可采用弹性材料计算。
With wide or range application of concrete gravity dam and the increasing of its height,the impact of working conditions in part of dam on the whole dam operation system is growing.Thus,gravity dam optimization design which aims to fit for engineering practice is particularly important.Based on a typical example of gravity dam,a new method that 3D numerical simulation combined with anti-cut stability analysis was employed to analyze the stability of that gravity dam.The calculation results indicates that tension stress appeared in abutment,hereof an optimization based on the original design is carried out,and the improved results shows that there is no tension stress in abutment.By comparing the original design and optimized design,conclusions are given as following: in order to reduce maximum tensile in abutment,concrete gravity abutment should be designed a certain angle with main dam or be designed similar to abutment of arch dam;the method of 3D numerical simulation combined with anti-cut stability analysis can be used in the analysis of congener gravity dam;when the results of 2D sliding stability analysis can satisfy code' s requirements,elastic material can be used in 3D numerical simulation.
With wide or range application of concrete gravity dam and the increasing of its height,the impact of working conditions in part of dam on the whole dam operation system is growing.Thus,gravity dam optimization design which aims to fit for engineering practice is particularly important.Based on a typical example of gravity dam,a new method that 3D numerical simulation combined with anti-cut stability analysis was employed to analyze the stability of that gravity dam.The calculation results indicates that tension stress appeared in abutment,hereof an optimization based on the original design is carried out,and the improved results shows that there is no tension stress in abutment.By comparing the original design and optimized design,conclusions are given as following: in order to reduce maximum tensile in abutment,concrete gravity abutment should be designed a certain angle with main dam or be designed similar to abutment of arch dam;the method of 3D numerical simulation combined with anti-cut stability analysis can be used in the analysis of congener gravity dam;when the results of 2D sliding stability analysis can satisfy code' s requirements,elastic material can be used in 3D numerical simulation.
引文
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[9]黄东军,聂广明.重力坝深层抗滑稳定安全评价若干问题的思考——兼对《对重力坝设计规范中双斜滑动面抗滑稳定分析公式讨论意见》的答复[J].水力发电学报,2005(2):90-95.
[10]麦家煊.重力坝基本断面的快速优化设计[J].水利学报,2000(8):21-26.
[11]袁林娟,常晓林.整体式折线重力坝的深层抗滑稳定及加固研究[J].岩土力学,2003,24(4):626-630.
[12]中华人民共和国水利部.SL319—2005混凝土重力坝设计规范[S].北京:中国水利水电出版社,2005.
[2]姜燕,乐金朝.动水动土共同作用下重力坝的地震响应分析[J].人民黄河,2010,32(2):105-108.
[3]何建涛,张伯艳,李德玉,等.官地重力坝静动力分析[J].水利水电技术,2009,40(5):35-38.
[4]Linke Li,Aijun Zhang,Jingyu Liu,et al.3D Numerical Simulation of Majiabi-an Concrete Gravity Dam[J].Applied Mechanics and Materials,2011,90-93:2624-2632.
[5]周伟,常晓林,徐建强.基于分项系数法的重力坝深层抗滑稳定分析[J].岩土力学,2007,28(2):315-320.
[6]蒋春艳,常晓林,周伟.用于重力坝抗滑稳定分析的分项系数有限元方法[J].水力发电学报,2006(2):16-20.
[7]常晓林,黄东军,蒋春艳,等.重力坝抗滑稳定设计表达式及分项系数研究[J].岩土工程学报,2007,29(8):1119-1123.
[8]陈祖煜,陈立宏.对重力坝设计规范中双斜面抗滑稳定分析公式的讨论意见[J].水力发电学报,2002(2):101-108.
[9]黄东军,聂广明.重力坝深层抗滑稳定安全评价若干问题的思考——兼对《对重力坝设计规范中双斜滑动面抗滑稳定分析公式讨论意见》的答复[J].水力发电学报,2005(2):90-95.
[10]麦家煊.重力坝基本断面的快速优化设计[J].水利学报,2000(8):21-26.
[11]袁林娟,常晓林.整体式折线重力坝的深层抗滑稳定及加固研究[J].岩土力学,2003,24(4):626-630.
[12]中华人民共和国水利部.SL319—2005混凝土重力坝设计规范[S].北京:中国水利水电出版社,2005.
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