摘要
某水库坝后汇总渗漏量约为16.7L/s,渗水点分布于坝脚排水棱体和低涵出口,但钻孔揭露坝轴线高压旋喷灌浆防渗体胶结密实,属弱—微透水性,说明大坝内渗漏通道可能并非存在于防渗体中。为查明大坝渗漏险情来源及原因,采用管道机器人对低涵管身内渗漏隐患进行影像识别,并辅以地质钻孔验证。探测结果表明:低涵管内水皆来自管壁外水内渗,且渗漏点绝大部分集中在桩号K0+058~K0+131.5m范围内,以淋雨状或射流状为主,桩号K0+024.5~K0+058和K0+131.5~K0+150m段以滴水或渗水为主,其余段无渗水。查明集中渗漏量约0.1~3.0L/s的外水内渗点有14处,小于0.1L/s有21处。低涵桩号K0+024.5~K0+180段管身内侧混凝土被冲刷,老化、剥蚀极严重,凹凸不平,相邻管连接部位多存在错位,并多伴有析出物和渗水。高压旋喷灌浆防渗体轴线与低涵管轴线交点处,管身顶部存在高度约为1.4m块碎石骨架体,内含充填物已完全被冲走,并形成贯穿性渗漏通道,是坝脚排水棱体集中渗漏及涵管渗漏的主要原因。
The total leakage amount behind the dam of a reservoir is about 16.7L/s,and the seepage points are distributed in the drainage prism at the dam toe and the outlet of the low culvert.However,the drilling revealed that the high-pressure rotary jet grouting impervious core of the dam axis is cemented tightly and has the weak-slight permeability,and the leakage channel in the dam may not be stored in the impervious core.In order to find out the source and cause of the dam leakage hazard,the pipeline robot is used to image identify the leakage hazard in the low culvert pipe body,and the geological drlling is used to verify.The detection results show that the water inside the low culvert pipe comes from the water outside the pipe wall,and most of the leakage points are concentrated in the range of stake No.K0+058~0+K0+131.5m,mainly in the form of rain or jet.The sections of stake No.K0+024.5~K0+058 and K0+131.5~K0+150m are mainly in the form of drip or seepage,and the rest sections have no seepage.There are 14 seepage points with concentrated leakage of about 0.1~3.OL/s,and there are 21 points with less than 0.1L/s.The concrete inside the pipe body of low culvert with the stake No.K0+024.5~K0+180 sections is severely scoured,aged,denuded and uneven,the connecting parts of adjacent pipes are often dislocated,accompanied by precipitates and water seepage.At the intersection of the axis of the high-pressure rotary jet grouting impervious core and the axis of the low culvert,there is a gravel skeleton with a height of about 1.4m at the top of the pipe body,and the filling material has been completely washed away,forming a penetrating leakage channel,which is the main reason for the concentrated leakage of the drainage prism at the dam toe and the leakage of the culvert pipe.
作者
姚纪华
伍佑伦
刘亚玲
梁经纬
杨媛丽
Yao Jihua;Wu Youlun;Liu Yaling;Liang Jingwei;Yang Yuanli(Hunan Water Resources and Hydropower Research Institute,Changsha 410007,China;Hunan Jiuyi Engineering Design Co.,Ltd.,Changsha 410018,China)
出处
《工程勘察》
2023年第12期75-80,共6页
Geotechnical Investigation & Surveying
基金
长沙市自然科学基金项目(kq2202358)
湖南省重大水利科技项目(XSKJ2021000-09)
湖南省水利水电科学研究院优秀人才培养支撑项目(2021-11、2021-01)。
关键词
综合地质法
管道机器人
探测
渗漏隐患
外水内渗
错位
comprehensive geological method
pipeline robot
detecting
potential leakage
external water infiltration
dislocation
