长江科学院院报 ›› 2022, Vol. 39 ›› Issue (6): 64-68.DOI: 10.11988/ckyyb.20210203

• 水力学 • 上一篇    下一篇

基于示踪试验的空腔连通性及管道水力参数测定

范时杰1,2, 杨艳娜1, 许模1, 范全忠1, 余磊1, 甘小泉3   

  1. 1.成都理工大学 环境与土木工程学院,成都 610059;
    2.四川省水利水电勘测设计研究院有限公司,成都 610072;
    3.浙江华东建设工程有限公司,杭州 310000
  • 收稿日期:2021-03-10 修回日期:2021-09-19 出版日期:2022-06-01 发布日期:2022-06-30
  • 通讯作者: 杨艳娜(1978-),女,副教授,博士,主要从事水文地质与工程地质研究。E-mail:30312790@qq.com
  • 作者简介:范时杰(1996-),男,四川成都人,硕士研究生,主要从事工程水文地质研究。E-mail:905950573@qq.com

Measurement of Cavity Connectivity and Pipeline’s Hydraulic Parameters Based on Tracer Test

FAN Shi-jie1,2, YANG Yan-na1, XU Mo1, FAN Quan-zhong1, YU Lei1, GAN Xiao-quan3   

  1. 1. School of Environmental and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;
    2. Sichuan Water Resources and Hydroeleectric Investigation & Design Institute Co.,Ltd.,Chengdu 610072,China;
    3. Zhejiang Huadong Construction Engineering Co., Ltd., Hangzhou 310000, China
  • Received:2021-03-10 Revised:2021-09-19 Online:2022-06-01 Published:2022-06-30

摘要: 云南省巧家县白鹤滩水库建成后,位于金沙江右岸富水冲洪积扇内的白鹤滩水电站移民安置用地中,钻孔揭露大量空腔,为了探究该地块地下水渗流规律及空腔连通特征,采用示踪试验进行研究。本次示踪试验历时2 d,以荧光素钠为示踪剂,采用V1600型可见分光光度计在波长为495 nm时检测样品中荧光素钠吸光度,根据决定系数R2=0.945 1的荧光素钠浓度-吸光度标准曲线换算荧光素钠浓度,获得单峰型荧光素钠浓度时间序列曲线。通过示踪试验揭示了场地区地下水整体由东向西流动,往区域最低排泄基准面金沙江排泄。场地区有2个地下水主要径流通道:①钻孔BK4163—BK4114—BK486方向;②钻孔BK4163—BK4224方向。同时根据 Qtracer2计算模型将示踪剂浓度曲线进行了定量分析,得出了过水通道的结构参数和水力学参数。

关键词: 示踪试验, 地下水, 荧光素钠, 渗流通道, 地下空腔

Abstract: After the completion of Baihetan reservoir construction in Qiaojia County, Yunnan Province, a large number of cavities were exposed by boreholes in the resettlement land of residents, which is located in the water-rich alluvial fan on the right bank of Jinsha River. A Two-day tracer test was carried out to explore the groundwater seepage law and cavity connection characteristics. Fluorescein sodium was selected as tracer, and the V1600 visible spectrophotometer was used to detect the absorbance of sodium fluorescein in the sample with a wavelength of 495 nm. The absorbance of sodium luciferin concentration was converted according to the standard curve of sodium luciferin concentration versus absorbance with R2=0.945 1. The time series curve of sodium fluorescein concentration with single peak was also obtained. The tracer test unveil that groundwater flows from the east to the west in general and discharges to the Jinsha River at the lowest datum level of regional discharge. Two main channels of groundwater runoff were revealed in the field area: borehole BK4163-BK4114-BK486 direction and borehole BK4163-BK4224 direction. In addition, the structural parameters and hydraulic parameters of runoff channels were acquired via quantitative analysis of concentration curve of the tracers by using Qtracer2 calculation model.

Key words: tracer test, groundwater, fluorescein sodium, seepage channel, underground cavity

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