摘要
实体重力坝由于剖面尺寸大,混凝土用量较多,在设计时要进行最优化设计以使坝型既安全又经济。然而重力坝在运行中,上游坝踵区往往会出现开裂,随着筑坝高度的增加,坝踵开裂的概率也会越来越大,但坝踵的开裂并不一定意味着坝体的毁坏,只要保证裂缝是稳定的,坝体仍能正常运行。基于这一情况,对重力坝考虑开裂约束下的体型优化设计进行了研究,引入断裂参数约束式,建立开裂约束条件下的优化设计数学模型。并通过对工程实例的优化计算分析得出了合理的坝体断面,优化效果比较理想。
Because of the large section size of the gravity dam, the volume of concrete expense is huge. How to optimize the dam shape to make it safaty and economy is a problem needed to be solved in design. However, when the gravity dam is working, the upstream heel area may appear cracks. With the enhancement of dam height, the probability of occurring cracks in the heel area is great. But the cracks in heel area don＇t mean the dam to be destroyed. The dam can work normally under the crack existence. In the paper, the form optimization of the gravity dam subject to crack constraint is studied based on this circumstance. A mathematical model used for the optimal design of dam crack constraint is established, in which a crack constraint expression is let in. By an illustration, a reasonable section is obtained and compared with original one. The optimal section is considered as ideal.
出处
《长江科学院院报》
CSCD
北大核心
2008年第6期106-109,共4页
Journal of Changjiang River Scientific Research Institute
关键词
重力坝
开裂约束
应力强度因子
体型优化设计
gravity dam
crack constraint
stress strength factor
shape optimization design
