摘要
混凝土坝坝体渗漏会影响大坝的安全性和耐久性,以云南龙江水电站大坝坝体渗漏水下修复处理为背景,详细介绍修复处理过程并对处理效果进行评述。为探明坝体入渗点部位,首先采用温度测试法初步查找渗漏范围,再采取水下扩大检查的方式明确渗漏点具体位置。通过水下检查最终确定9^(#)坝段832.00 m和816.00 m、10^(#)坝段830.00 m和808.00 m层间缝混凝土存在质量缺陷,为坝体渗漏通道的主要入渗点。然后,采用水下处理的方式进行坝体修复,从源头对入渗点进行封堵,坝体经修复处理后,渗漏量由近年来最大值74.85 L/s降低至正常蓄水位下渗漏量仅6.04 L/s,处理效果较好。从坝体渗漏水下检查情况来看,层间缝是混凝土坝坝体渗漏的主要通道。层间缝是贯穿于坝体浇筑全过程的施工缝,应在施工过程中加强质量控制,以保证各层混凝土之间的充分结合。所采用的渗漏水下修复处理技术可有效解决坝体局部渗漏缺陷问题,可供类似工程借鉴。
Leakage of concrete dam body affects the safety and durability of the dam.Based on the dam body leakage remediation of Longjiang hydropower station in Yunnan Province,the remediation of the dam is introduced in detail,and the remediation result is discussed.In order to find the possible leakage entrance,temperature tracing is applied for finding the range of leakage entrance,and then the specific leakage point is indicated by subaqueous extended check.Through subaqueous check,defects in the concrete dam body between the layers are detected.The main entrance points of leakage passage are located at elevation 832.00 m and 816.00 m in dam block 9^(#),and 830.00 m and 808.00 m in dam block 10^(#).Therefore,subaqueous remediation is adopted for the dam body,and leakage entrance is blocked from source.After the remediation of the dam body,leakage decreases from maximum 74.85 L/s in recent years to 6.04 L/s under normal water level.From the subaqueous check of the dam body before remediation,the seams between layers are identified as the main way of leakage in the concrete dam.The seams between layers are produced during the whole construction process.Hence,it is necessary to enhance the quality control during construction process to ensure the bond of each layer in concrete.Above all,partial leakage defect could be solved by the leakage subaqueous remediation method provided here,and the practice could be used for similar projects.
作者
李铮
李宏恩
张安富
刘定忠
LI Zheng;LI Hongen;ZHANG Anfu;LIU Dingzhong(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Yunnan Longjiang Water Complex Development Corporation Limited,Mangshi 678400,China)
出处
《水利水运工程学报》
CSCD
北大核心
2022年第1期137-143,共7页
Hydro-Science and Engineering
基金
国家重点研发计划课题资助项目(2016YFC0401809,2017YFC0405006)
中央级公益性科研院所基本科研业务费资助项目(Y717012,Y720008)。
关键词
混凝土坝
坝体渗漏
水下处理
层间缝
龙江水电站
concrete dam
dam body leakage
subaqueous remedy
seam between layers
Longjiang hydropower station
