某拱坝基础垫层温度应力场仿真分析
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摘要
针对碾压混凝土拱坝基础垫层易存在温度裂缝的问题,以某碾压混凝土拱坝基础垫层为例,采用三维有限元浮动网格法,模拟基础垫层跳仓浇筑过程,并进行温度应力场仿真分析。结果表明,控制混凝土浇筑温度14℃,采取通水温度20℃、通水时长15d等温控措施,可使最大温度应力满足应力控制标准;上部碾压混凝土浇筑时间应早于2016年10月15日。研究结果为碾压混凝土拱坝基础垫层混凝土施工及确定上部碾压混凝土开浇时间提供了依据。
In consideration of the temperature cracking of the foundation cushion for roller compacted concrete arch dam,three-dimensional finite element relocating mesh method was used to calculate the temperature and stress field and simulate the sequence concrete placement construction process of the foundation cushion.The results show that control of the pouring temperature 14 ℃,water temperature 20 ℃ and water flow time 15 dcan make the maximum temperature stress meeting stress control criterion of the foundation cushion.The pouring time of the top roller compacted concrete should be early Oct.15,2016.The research result laid an essential basis for the bed concrete construction and determining optimum time of beginning to pouring of the top roller compacted concrete.
In consideration of the temperature cracking of the foundation cushion for roller compacted concrete arch dam,three-dimensional finite element relocating mesh method was used to calculate the temperature and stress field and simulate the sequence concrete placement construction process of the foundation cushion.The results show that control of the pouring temperature 14 ℃,water temperature 20 ℃ and water flow time 15 dcan make the maximum temperature stress meeting stress control criterion of the foundation cushion.The pouring time of the top roller compacted concrete should be early Oct.15,2016.The research result laid an essential basis for the bed concrete construction and determining optimum time of beginning to pouring of the top roller compacted concrete.
引文
[1]张宇,冯新,侯爽,等.结构缝对高碾压混凝土拱坝地震破坏机理影响的试验研究[J].水利学报,2015,46(10):1 222-1 232.
[2]张国新,杨波,张景华.RCC拱坝的封拱温度与温度荷载研究[J].水利学报,2011,42(7):812-817.
[3]李守义,马强,张晓飞.基于有限元等效应力法的高拱坝封拱温度场研究[J].水力发电学报,2015,34(7):88-94.
[4]朱伯芳.RCC坝仿真计算非均匀单元的初始条件[J].水力发电学报,2000,19(1):81-85.
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[6]闫建文,张晓飞,张雷,等.强制冷却对碾压混凝土重力坝温度场和温度应力的影响分析[J].水资源与水工程学报,2014,25(3):157-160.
[7]陈乔.向家坝水电站抗冲耐磨混凝土温控防裂措施探讨[J].人民长江,2015,46(2):101-103.
[8]林鹏,李庆斌,周绍武,等.大体积混凝土通水冷却智能温控控制方法与系统[J].水利学报,2013,44(8):950-956.
[9]SL319-2005,混凝土重力坝设计规划[S].北京:中国水利水电出版社,2005.
[2]张国新,杨波,张景华.RCC拱坝的封拱温度与温度荷载研究[J].水利学报,2011,42(7):812-817.
[3]李守义,马强,张晓飞.基于有限元等效应力法的高拱坝封拱温度场研究[J].水力发电学报,2015,34(7):88-94.
[4]朱伯芳.RCC坝仿真计算非均匀单元的初始条件[J].水力发电学报,2000,19(1):81-85.
[5]张国新.碾压混凝土坝的温度控制[J].水利水电技术,2007,38(6):41-46.
[6]闫建文,张晓飞,张雷,等.强制冷却对碾压混凝土重力坝温度场和温度应力的影响分析[J].水资源与水工程学报,2014,25(3):157-160.
[7]陈乔.向家坝水电站抗冲耐磨混凝土温控防裂措施探讨[J].人民长江,2015,46(2):101-103.
[8]林鹏,李庆斌,周绍武,等.大体积混凝土通水冷却智能温控控制方法与系统[J].水利学报,2013,44(8):950-956.
[9]SL319-2005,混凝土重力坝设计规划[S].北京:中国水利水电出版社,2005.