基于挑坎优化的护岸不护底水垫塘底板冲刷试验  

Scouring test on plunge pool with protected bank and unprotected bottom plate by flip bucket style optimization

作　　者：双学珍 于广斌 张婧镁 张智涌 SHUANG Xuezhen;YU Guangbin;ZHANG Jingmei;ZHANG Zhiyong(Sichuan Water Conservancy Vocational College,Chengdu 611230,China;Third Engineering Bureau of China Anneng Construction Group Co.,Ltd.,Chengdu 610000,China;College of Water Conservancy and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川水利职业技术学院,四川崇州611230 [2]中国安能建设集团有限公司第三工程局,四川成都610000 [3]四川大学水利水电学院,四川成都610065

出　　处：《人民长江》2020年第7期162-167,共6页Yangtze River

摘　　要：为研究新疆阿尔塔什水利枢纽工程中护岸不护底水垫塘是否满足冲刷要求,开展了一系列水工模型试验。分析了水垫塘中线、左岸、右岸坡脚3个典型剖面在4种工况下的冲坑深度变化情况,发现水垫塘受到严重冲刷。因此,提出3种挑坎优化方案:分别为调整中孔右导墙、2号表孔左导墙的半径;在2号表孔和中孔挑坎末端增设向上翘起的舌型挑坎;在2号表孔挑坎左侧增设曲面贴角挑坎,并进行了相应的冲刷试验。结果表明:通过调整导墙半径、增设舌型挑坎与曲面贴脚挑坎,水垫塘中线剖面、左、右岸坡脚的冲坑深度分别降至6,5,4 m以下,整体冲坑深度在允许范围内,满足冲刷要求。To make sure the plunge pool with protected bank and unprotected bottom plate in Altash Water Control Project in Xinjiang can meet the requirements of scour prevention,a series of hydraulic model tests were conducted.In this study,the scour depths at middle,left and right bank of plunge pool slope foot were analyzed under 4 typical working conditions,which indicated the plunge pool was severely scoured.Therefore,we proposed three schemes of flip bucket style optimization.The first scheme was adjusting the right guide wall radius of the middle hole and the left guide wall radius of the NO.2 surface hole.The second scheme was adding upward raised tongue flip buckets at the end of the NO.2 surface hole and the middle hole flip bucket respectively.The third scheme was adding a curved angle flip bucket at the left side of the NO.2 surface hole flip bucket.Then,we carried out scouring tests on the three schemes.The results showed that the scour depths of middle,left and right bank were less than 6,5,4 m by adjusting the right guide wall radius,adding upward raised tongue flip bucket and curved angle flip bucket.Hence,the scour depths were within the allowable range,which met the requirements of scour prevention.

关 键 词：护岸不护底水垫塘 冲刷试验 挑坎优化 冲坑深度 挑流消能 辅助消能工 

分 类 号：TV653[水利工程—水利水电工程]