基于流场法的渗漏路径探测方法研究
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摘要
流场法是一种用于渗漏点探测的高效、精确的方法,已广泛应用于水利工程渗漏点探测并取得了良好的效果。本文基于流场法渗漏点探测的理论基础,对渗漏路径探测的理论进行分析,研究制定出渗漏路径探测的具体方法。结合某水电站工程进行探测试验,经人工加载电流场后,在钻孔内不同深度位置均可测量得到一个电势,对比灌浆处理前、后分别测得的电势曲线,可见灌浆前的高电势异常区的电势降为背景值或接近背景值,推测高电势异常为渗漏路径位置的直观反映,表明该方法是渗漏路径探测的一种有效方法。
Flow field method is effective and accurate to detect leakage points which has been widely used in hydraulic engineering and has achieved good results. Based on the leakage detection theory of flow field method, the leakage path detection is discussed and the specific method to detect the leakage path is proposed. A case study of the leakage detection in a hydropower project is carried out. The electric potential can be measured at different depth in the borehole of an artificial current field. Comparing the potential curves measured before and after the grouting, it can be seen that the high potential anomaly zone before grouting is reduced to the background value or close to the background value, which inferred that anomaly area is the visual reflection of the leakage. The method is an effective way to detect leakage path.
Flow field method is effective and accurate to detect leakage points which has been widely used in hydraulic engineering and has achieved good results. Based on the leakage detection theory of flow field method, the leakage path detection is discussed and the specific method to detect the leakage path is proposed. A case study of the leakage detection in a hydropower project is carried out. The electric potential can be measured at different depth in the borehole of an artificial current field. Comparing the potential curves measured before and after the grouting, it can be seen that the high potential anomaly zone before grouting is reduced to the background value or close to the background value, which inferred that anomaly area is the visual reflection of the leakage. The method is an effective way to detect leakage path.
引文
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[2] 信永水.综合物探方法勘察瀑河水库渗漏通道[J].河北经济学院学报,1982,(1):126～148.Xin Yongshui.The application of the integrated geophysical method to the leakage detection path of Baohe Reservoir[J].Journal of Shijiazhuang University of Economics,1982,(1):126～148. (in Chinese)
[3] 王运生,冷元宝.地震透射层析成像在水库工程中的应用[J].勘察科学技术,1992,(1):56～58.Wang Yunsheng,Leng Yuanbao.Application of seismic transparent geotomography on a reservior project investigation[J].Site Investigation Science and Technology,1992,(1):56～58. (in Chinese)
[4] 黄浩权.英德市枫树坪水库地震勘探土坝渗漏[J].广东水利水电,1996,(1):45～48.Huang Haoquan.Earth dam seepage survey by earthquake gauge in Fengshuping Reservoir of Yingde City[J]. Guangdong Water Resources and Hydropower,1996,(1):45～48. (in Chinese)
[5] 李大心,祁明松,王传雷.江河堤防隐患的地质雷达调查[J].中国地质灾害与防治学报,1996,(1):21～25.Li Daxin,Qi Mingsong,Wang Chuanlei.Georadar investigation for hidden danger in river dykes[J]. The Chinese Journal of Geological Hazard and Control,1996,(1):21～25. (in Chinese)
[6] 冷元宝,何剑.物探新技术在治黄工作中的应用[J].水利水电科技进展,2000,20(2):64～65.Leng Yuanbao,He Jian. Application of new technology geophysical in the governance work of Yellow River[J].Advances in Science and Technology of Water Resources,2000,20(2):64～65. (in Chinese)
[7] 郭铁柱.高密度电法在崇青水库坝基渗漏勘查中的应用[J].北京水利,2001,(2):39～40.Guo Tiezhu.Application of high-density resistance method in dam foundation seepage exploration of Chongqing Reservoir[J]. Beijing Water Resources,2001,(2):39～40. (in Chinese)
[8] 孙继朝,贾秀梅,刘满杰等.岳城水库坝基渗漏多元示踪试验研究[J].工程勘察,2008,(10):30～34,52.Sun Jichao,Jia Xiumei,Liu Manjie et al.Experimental study on multi-element tracing for the seepage of dam foundation in Yuecheng Reservoir[J].Geotechnical Investigation & Surveying,2008,(10):30～34,52. (in Chinese)
[9] 姚纪华,宋汉周,罗仕军等.综合示踪法在岩溶水库渗漏探测中的应用[J].工程勘察,2014,(5):93～98.Yao Jihua, Song Hanzhou,Luo Shijun et al. Application of comprehensive detection of a tracing method in the leakage karst reservoir[J]. Geotechnical Investigation & Surveying, 2014,(5):93～98. (in Chinese)
[10] 李耀华,李旭,郭密文.综合地球物理方法在水库坝基渗漏探测中的应用研究[J].工程勘察,2016,(S2):627～631.Li Yaohua,Li Xu,Guo Miwen.The application study of integrated geophysical methods for detecting foundation leakage at reservoir[J]. Geotechnical Investigation & Surveying, 2016,(S2):627～631. (in Chinese)
[11] 戴前伟,何刚,王小平等.大坝坝基检测的新技术——伪随机流场法测井[J].地球物理学进展,2004,19(2):460～464.Dai Qianwei,He Gang,Wang Xiaoping et al. New technology for dam foundation detecting——Psuedorandom flow-field method logging[J]. Progress in Geophysics,2004,19(2):460～464. (in Chinese)
[12] 董延朋,徐方全,万海.堤坝管涌渗漏检测仪的应用效果研究[J].工程勘察,2007,(2):72～75.Dong Yanpeng,Xu Fangquan,Wan Hai.The effect of using levee piping and seepage detector[J]. Geotechnical Investigation & Surveying, 2007, (2):72～75. (in Chinese)
[13] 郑灿堂,万海,郑茂海.关于流场法理论的几点认识[J].地球物理学进展,2012,27(5):2190～2197.Zheng Cantang,Wan Hai,Zheng Maohai. Comments on flow field method[J]. Progress in Geophysics,2012,27(5):2190～2197. (in Chinese)
[14] 曾颉,黄勇.恰让水库坝基渗漏量模拟和影响因素分析[J].工程勘察,2017,(6):30～34.Zeng Jie, Huang Yong. Quantity calculation and influence factor analysis of seepage in Qiarang Reservoir dam[J]. Geotechnical Investigation & Surveying, 2017, (6):30～34. (in Chinese)
[15] 薛禹群.地下水动力学原理[M].北京:地质出版社,1986.Xue Yuqun.Principle of groundwater dynamics[M].Beijing: Geological Publishing House,1986.(in Chinese)