Monitoring technique for seepage line of tailings dam

Abstract

An automatic monitoring technique of the seepage line, including the monitoring design, the automatic monitoring system and the backfill technique of the measuring probe of pore-water pressure, was used in a tailings dam, and a shallow refractive seismic method was investigated for obtaining the seepage line of those areas outside the monitoring zone. The results show that the automatic monitoring has the error within ±3% relative to piezometric tube method and improves monitoring efficiency greatly, and the shallow refractive seismic method has the error within ±10% but expands the area of monitoring. Both of them can be used for a daily measurement in monitoring the seepage line. The result of the automatic monitoring also shows that not only the design of the survey line and the backfill technique of the measuring probe of pore-water pressure are reasonable and economic but also the reliability and safety of the automatic monitoring system are better. Testing result by the shallow refractive seismic method in tailings reveals that the energy excited by hammering iron sheet-pole is strong enough and safe, and that the character of anti-jamming by the detectors with long tailcone is better.

Keywords

tailings dam / seepage line / automatic monitoring / shallow refractive seismic

References

[1] LiX B, JiangW D, ZhaoF J. Fault tree analysis of tailings dam breaking during flood season [J]. Journal of Safety and Environment, 2001, 1(5): 45-48(in Chinese)

[2] JIANG W D, LI X B. Remediation and monitoring in the No. 2 Tailings Dam, Dexing Copper Mine, China[A]. 3rd International Conference on Landslides, Slope Stability & The Safety of Infra-structures [C]. Singalpore, 2002.

[3] BudhuM, GobinR. Seepage-induced slope failures on sandbars in Grand Canyon [J]. Journal of Geotechnical Engineering, 1995, 121(8): 601-609

[4] SoongT, KoernerR M. Seepage induced slope instability [J]. Geotextiles and Geomembranes, 1996, 14(7–8): 425-445

[5] LuG. Development of safety monitoring technology, automatic safety monitoring devices and monitoring systems for dams [J]. Dam Observation and Geotechnical Tests, 2001, 25(3): 1-4(in Chinese)

[6] PeiG, LuW L. Study on the safety monitoring automatic system of Erjiang water discharge gate of Gezhouba key water control project [J]. Journal of Nanjing Architectural and Civil Engineering Institute, 1997, 43(4): 55-60(in Chinese)

[7] ZhouJ Y. Application of safety monitoring automation system in Gezhouba project [J]. Dam Observation and Geotechnical Tests, 1998, 22(4): 22-27(in Chinese)

[8] ChenS Q. The application of reflection coefficient (k) method in red beds to survey plerotic water [J]. Journal of Central South University of Technology, 1996, 27(5): 516-519(in Chinese)

[9] LiuH. The possibility of high resolution detection for subsurface oil, gas and water by means of natural electromagnetic field [J]. Acta Geophysica Sinica, 1994, 37(6): 828-835(in Chinese)

[10] ChenJ Z, ChenW H, ZhouH C. Application of geologic stratified photography technology in water projects [J]. Water Conservancy and Hydropower Technology, 1999, 30(9): 52-54(in Chinese)