强风化坝基渗水堵漏脉动灌浆技术  

Seepage plugging technology for strongly weathered dam foundation

作　　者：张贵金[1,2] 司马尹亮 陈安重 段吉鸿 范涛 王首卜 ZHANG Guijin;SIMA Yinliang;CHEN Anzhong;DUAN Jihong;FAN Tao;WANG Shoubu(School of Water Conservancy Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China;Hunan Provincial Key Laboratory of Water and Sediment Science and Water Disaster Prevention,Changsha 410114,Hunan,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha 410000,Hunan,China;Honghe Hani and Yi Autonomous Prefecture Water Conservancy and Hydropower Engineering Geological Survey Consulting and Planning Institute,Honghe 661100,Yunnan,China)

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410114 [2]湖南省水沙科学与水灾害防治重点实验室,湖南长沙410114 [3]中国电建集团中南勘测设计研究院,湖南长沙410000 [4]红河哈尼族彝族自治州水利水电工程地质勘察咨询规划研究院,云南红河661100

出　　处：《水利水电技术（中英文）》2022年第3期78-83,共6页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金(51279019)。

摘　　要：云南红河州八尺水库为绿春县新增水源工程,水资源十分宝贵,2015年开工建设,2017年面板堆石坝开始蓄水。随库水位上升坝基渗水量逐渐加大,先后2次空库后采用常规灌浆方式对坝基进行灌浆补强后,最大渗水量还有0.1 m^(3)/s,蓄水一直达不到正常水位,原因是坝基强风化地层破碎结构,采用常规灌浆工艺必然存在灌浆范围不可控、局部跑浆、均一性差、低压灌注不密实等问题,难以形成有效的防渗帷幕结构。通过系统研究分析地质条件、防渗结构及灌浆技术,采用“引孔自下而上小段脉动灌浆”工艺,以灌入量及抬动值控制灌浆压力,实施控制性灌浆,并根据施工过程钻孔、灌浆、渗漏量监控等动态信息,不断优化钻灌工程量。按照这一技术路线,先进行灌浆试验、再实施强化灌浆施工,对于没有腾空库容的水下20 m范围,布置少量斜孔灌浆,灌后所有检查孔渗透率控制在5 Lu以下,整体渗水量降低到约0.011 m^(3)/s(正常蓄水位),下降了90%。此技术对此类坝基防渗和堵漏均有良好的应用价值。Bachi Reservoir in Honghe Prefecture is a new water source project in Luchun County;of which the construction started in 2015 and the impoundment began in 2017 with a concrete face rockfill dam.Following with the rise of the reservoir water level,the seepage from the dam foundation gradually increase and the maximum seepage is still 0.1 m^(3)/s after the grouting reinforcement of the dam foundation with the conventional grouting technology after two times of reservoir emptying,thus the impoundment of the reservoir never reach to the normal water level;for which the causation is that as the dam foundation is consisted of a broken structure of strongly weathered stratum,the grouting range cannot be controlled by the conventional grouting technology with the problems of poor uniformity of local grout runout,uncompacted low-pressure grouting,etc.,and then an effective anti-seepage grouting curtain is difficult to be formed.Through the systematic study of the geological condition,anti-seepage structure and grouting technology,a technology of“small section pulsating grouting with pilot hole from bottom to top”is adopted,with which a controlled grouting is implemented by means of controlling the grouting pressure with grouting amount and lifting value,while the drilling and grouting construction quantities are continuously optimized according to the dynamic information of drilling,grouting,seepage amount,etc.during the construction.In accordance with this technical line,a grouting experiment is made at first and then the intensified grouting construction is implemented.For the underwater range of 20 m without emptying,a small number of oblique grouting holes are arranged.After grouting,all the seepage rates of the inspection holes are controlled below 5 Lu,the overall seepage amount is decreased to about 0.011 m^(3)/s(for the normal water storage level)with the decreasing amplitude of 90%.This technology has better application value for both the anti-seepage and leakage-plugging of this kind of dam foundation.

关 键 词：破碎岩体 灌浆机理 灌浆工艺 帷幕灌浆 

分 类 号：TV522[水利工程—水利水电工程]