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工程科学与技术:2019,51(4):30-36
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荧光光电法在库岸滑坡地下渗流监测中的适宜性研究
(1.三峡大学 湖北长江三峡滑坡国家野外科学观测研究站, 湖北 宜昌 443002;2.三峡大学 水利与环境学院, 湖北 宜昌 443002)
Study on the Suitability of Fluorescence Photoelectric Method in Monitoring Underground Seepage of Reservoir Bank Landslide
(1.National Field Observation and Research Station of Landslides in Three Gorges of Yangtze River, China Three Gorges Univ., Yichang 443002, China;2.College of Water Conservancy and Environment, China Three Gorges Univ., Yichang 443002, China)
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投稿时间:2019-03-12    修订日期:2019-05-04
中文摘要: 以单孔稀释数学模型为理论依据,建立荧光光电流与坡体地下渗透流速的数学关系模型,设计开发适用于库岸坡体观测孔的地下渗透流速的荧光光电监测探头及测试系统。通过开展室内试验,研究不同浓度荧光溶液的光电流特性,以及环境水温、酸碱度、浑浊度等地下水环境因素对荧光光电流强度的影响,进而论证荧光光电法在库岸滑坡地下渗流监测中的适宜性。结果表明:5~25 ℃温度范围内,光电流强度随荧光溶液浓度增大而增大,在0~0.006 5%的低浓度范围内存在显著的线性关系,满足应用荧光光电测速法进行坡体地下渗透流速监测的理论条件要求;在荧光溶液浓度一定的条件下,光电流强度随温度升高而逐渐减小,线性规律明显,且不同浓度的拟合直线呈近似平行分布,斜率不大。温度对光电流强度的影响远低于浓度变化带来的影响,但实际应用时起始量测温度与结束量测温度基本相等,温度对坡体地下渗透流速的监测结果产生的影响可忽略不计。强酸性条件下会降低荧光剂的分子活性,使光电流强度明显下降,但加入碱中和后荧光溶液活性恢复,选用的Luyor-6200荧光试剂可满足常规酸性和碱性地下水环境下渗透流速的监测。浑浊度对光电流影响较大,但浑浊荧光溶液经历长时间静置后,光电流强度可恢复至正常荧光溶液的光电流强度值;依据试验可知,开展现场应用时,测孔成孔后至少需静置4 d以上才能达到观测要求。最后,给出了应用荧光光电测速法开展滑坡体渗透流速现场监测的实施方案。
Abstract:Based on the single hole dilution mathematical model, the mathematical relationship model between fluorescence photocurrent and seepage velocity of landslide slopes was established, and the fluorescence photoelectric monitoring probe and measuring system for seepage velocity of slope observation hole were designed and developed. Through laboratory experiments, the characteristics of photoelectric current of fluorescent solution with different concentration and the influence of groundwater environmental factors such as water temperature, turbidity, acidity and alkalinity on the intensity of fluorescent photoelectric current were studied, and the suitability of fluorescent photoelectric method in monitoring underground seepage of reservoir bank landslide was demonstrated. The results showed that the photocurrent intensity increases with the increase of fluorescent solution concentration in the temperature range of 5~25 ℃ and there is a significant linear relationship between the low concentration range of 0~0.006 5%, which meets the theoretical requirements of the application of fluorescent photoelectric velocimetry to the monitoring of seepage velocity in landslide slopes. At the same time, when the concentration of fluorescent solution is constant, the photocurrent intensity decreases gradually with the increase of temperature, and the linear law is obvious, and the fitting lines of different concentrations are approximately parallel distribution, with little slope. The influence of temperature on light current intensity is much lower than that of concentration change, but in practical application, the initial temperature and the end temperature are basically the same, and the influence of temperature on the monitoring results of seepage velocity can be neglected. Under strong acidic conditions, the molecular activity of fluorescent agent will be reduced, and the photocurrent intensity will be decreased obviously. However, the activity of fluorescent solution will be restored after alkali neutralization. The selected Luyor-6200 fluorescent reagent can satisfy the monitoring of seepage velocity in conventional acidic and alkaline groundwater environment. The turbidity has a great influence on the photocurrent, but the photocurrent intensity of the turbid fluorescent solution can be restored to that of the normal fluorescent solution after a long time of stationary. Therefore, it takes at least 4 days for the hole to be stationary for field application. Finally, the implementation scheme of on-site monitoring of seepage velocity of landslides by fluorescence photoelectric velocimetry was given
文章编号:201900207     中图分类号:TU432    文献标志码:
基金项目:国家重点研发计划项目(2017YFC1501100);国家自然科学基金项目(51679129)
作者简介:孟永东(1976-),男,教授,博士.研究方向:滑坡监测与预警技术及应用.E-mail:meng@ctgu.edu.cn
引用文本:
孟永东,万秒,田斌,朱伟玺,卢伟平.荧光光电法在库岸滑坡地下渗流监测中的适宜性研究[J].工程科学与技术,2019,51(4):30-36.
MENG Yongdong,WAN Miao,TIAN Bin,ZHU Weixi,LU Weiping.Study on the Suitability of Fluorescence Photoelectric Method in Monitoring Underground Seepage of Reservoir Bank Landslide[J].Advanced Engineering Sciences,2019,51(4):30-36.