银江水电站导流明渠截流戗堤龙口段的施工与过程控制  

Construction and Process Control of the Cofferdam Closure Crest at the Diversion Open Channel of Yinjiang Hydropower Project

作　　者：黄俊 马中将 高二强 HUANG Jun;MA Zhongjiang;GAO Erqiang(PowerChina Guiyang Engineering Corporation Limited,Guiyang Guizhou 550081)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《四川水力发电》2025年第1期66-69,74,共5页Sichuan Hydropower

摘　　要：银江水电站导流明渠采用右岸进占、单戗立堵的截流方式进行截流,其戗堤轴线长约113.5 m,戗堤底部高程为970.00 m,戗堤顶部高程为987.00 m,戗堤最大高度为17 m。在导流明渠截流过程中由左岸5个泄洪孔进行分流,其中坝前拦沙坎高程为982.00 m。根据拦沙坎堰前的水位实测资料:当上游来水量小于1000 m 3/s时,上游拦沙坎堰前的水位高程均低于高程982.00 m。经水力学计算得知:当上游来水量为1000 m 3/s、戗堤龙口宽度为35 m时,戗堤龙口上下游水位的落差约为2.13 m,戗堤龙口的平均流速约为5.50 m/s。随着戗堤龙口的不断缩窄,其龙口上下游的水位落差、水流流速及戗堤龙口的进占难度相应逐渐增大。根据导流明渠截流施工具有的特点,通过对截流方案、截流材料备料、截流过程控制以及截流后的后续工作进行分析总结,旨在为同类型水电工程的截流施工提供有益的参考与借鉴。The diversion open channel closure of Yinjiang Hydropower Project was carried out by the right-bank advancing single-cofferdam vertical closure method.The axis length of the cofferdam is approximately 113.5 m,the elevation of the bottom opening of the cofferdam is 970.0 m,the elevation of the top of the cofferdam is 987.0 m,and the maximum height of the cofferdam is 17 m.During the diversion open channel closure process,the flow was diverted through 5 flood discharge holes on the left bank,and the elevation of the sand retaining weir in front of the dam is 982.0 m.According to the measured water level data in front of the sand retaining weir,when the upstream inflow is less than 1000 m^(3)/s,the water level elevation in front of the upstream sand retaining weir is lower than EL.982.00 m.Through hydraulic calculations,when the upstream inflow is 1000 m^(3)/s and the width of the cofferdam closure crest is 35 m,the water level difference between the upstream and downstream of the cofferdam closure crest is approximately 2.13 m,and the average flow velocity at the cofferdam closure crest is approximately 5.50 m/s.As the cofferdam closure crest continuously narrows,the water level difference between the upstream and downstream,the flow velocity,and the difficulty of advancing the cofferdam closure crest will gradually increase accordingly.Based on the above construction characteristics of the diversion open channel closure,through the analysis and summary of the closure plan,the preparation of closure materials,the process control during the closure,and the follow-up work after the closure,it provides useful references and examples for the closure construction of similar hydropower project projects.

关 键 词：银江水电站 截流戗堤 龙口 施工过程控制 

分 类 号：TV7[水利工程—水利水电工程] TV51TV52