基于损伤理论的胶凝砂砾石坝运行期冻融仿真分析  

Simulation Analysis of Freeze Thawing of Cement Sand Gravel Dam in Operation Period Based on Damage Theory

作　　者：吴璞伟 郭利霞[1] 罗国杰[1] 孙明权[1] 

机构地区：[1]华北水利水电大学水利学院,河南郑州450045

出　　处：《水电能源科学》2017年第1期81-84,共4页Water Resources and Power

摘　　要：为研究冻融对胶凝砂砾石坝正常运行造成的影响,以守口堡胶凝砂砾石坝为研究对象,结合胶凝砂砾石结构冻融损伤特性,建立三维有限元冻融损伤模型,对坝体运行期不同工况下的温度、应力及损伤状况进行仿真分析。结果表明,普通胶凝砂砾石除易冻融破坏外,还易发生拉裂破坏;添加外加剂后抗冻性提高,但还不足以抵抗冻融;"金包银"措施能够有效改善坝内胶凝砂砾石的温度、应力状况,使其免受冻融影响,保证永久性水工建筑物运行期安全稳定。In order to study the freeze thawing effects on the normal operation of cemented sand gravel dam, taking Shoukoupu cemented sand gravel dam as research object, considering the freeze-thaw damage features of cemented sand gravel, three dimensional finite element model of freeze-thaw damage was established to simulate the temperature, stress and damage state of dam body in operation period under different working conditions. The results show that the ordinary cement sand gravel appears freeze-thaw damage easily and is prone to pull crack for destruction. Adding admixture can improve the frost resistance, but it is not enough to resist freeze thawing. The measures of ＇Gold-Rimming-Silvering＇ can effectively improve the state of temperature and stress of cemented sand gravel dam and prevent freeze thawing, which ensures permanent hydraulic structure safety and stability in operating period.

关 键 词：胶凝砂砾石坝 损伤 温度 冻融 仿真 

分 类 号：TV649[水利工程—水利水电工程]