溢流坝加固改造之挡水墙结构形式比选

为寻找合适的溢流坝挡水墙加固形式,以湖北省五峰县境内龙洞电站溢流坝改造项目为工程背景,采用Midas FEA建立有限元模型,对比分析砌体挡水墙和混凝土挡水墙的受力状态,比选最适宜的挡水墙结构形式。结果表明,砌体挡水墙无法满足结构的受力要求,其最大竖向拉应力达到砌体挡水墙弯曲抗拉强度平均值的2倍;混凝土挡水墙能够满足结构的受力要求,且有一定的安全储备。故采用混凝土挡水墙加固改造溢流坝,并在混凝土挡水墙的迎水面设置钢筋网,加大挡水墙的埋置深度。

Comparison and Selection of Water Retaining Wall Structural Forms in Reinforcement and Reconstruction of Overflow Dams

To find effective reinforcement for the overflow dam retaining wall,a finite element model was established using Midas FEA on the case of the overflow dam reconstruction project of Longdong Power Station in Wufeng County,Hubei Province,and masonry retaining wall and concrete retaining wall were compared and analyzed so that the most suitable structural form of the retaining wall was selected.The results show that the masonry retaining wall cannot meet the stress requirements of the structure,and its maximum vertical tensile stress is twice the average bending tensile strength of the masonry retaining wall,while the concrete retaining wall can meet the stress requirements of the structure with a certain safety reserve.Therefore,the overflow dam is reinforced and transformed with a concrete retaining wall with a steel mesh set on its upstream surface to increase the embedding depth of the retaining wall.