Optimal Method for Injection of Neutralizer into Embankment Structure Composed of Pyrite Rocks

Young-Suk Song; Jung-Mann Yun

doi:10.12814/jkgss.2023.22.4.073

All Issue

2023 Vol.22, Issue 4 Preview Page Next Page

Research Article

Optimal Method for Injection of Neutralizer into Embankment Structure Composed of Pyrite Rocks 황철석으로 조성된 성토구조체의 중화제 주입을 위한 최적 방안 제안

31 December 2023. pp. 73-82

PDF XML

Abstract

In this study, the optimal method for injection of neutralizer to restraint the leakage of acid drainage in embankment structure composed of pyrite rocks is proposed. Finite Element Analysis was performed to examine the seepage effect caused by injection of neutralizer into the embankment structure. The diameter of the neutralizer injection hole was selected as 50cm, the interval space of injection ranged from 1m to 4m and the injecting pressure ranged from 100kPa to 220 kPa were applied for the numerical analysis. According to the analysis results, the saturation time of the whole embankment structure was shown to be fast at a relatively low injecting pressure in the case of injecting interval space of 1.0m and injecting pressure of 130kPa and in the case of injecting interval space of 2.0m and injecting pressure of 160kPa. When the interval space of injection for saturation of whole embankment structure is selected as 3m, various injection pressures can be applied from 130kPa to 190kPa, and the saturation time of whole embankment is similar regardless of the injection pressure. Therefore, the optimal method for injection of neutralizer considering economic efficiency was selected as injecting interval space of 3.0m and injection pressure of 130kPa.

Keywords

Pyrite rocks

Acid drainage

Embankment structure

Neutralizer

Interval space of injection

Injecting pressure

본 연구에서는 황철석 암버럭으로 시공된 성토체를 대상으로 산성배수 발생을 억제하기 위하여 중화제를 주입할 경우 최적의 주입방안을 제시하고자 한다. 성토체 내에 중화제 주입으로 인한 침투효과를 수치해석으로 검토하기 위하여 유한요소해석을 수행하였다. 수치해석을 위하여 중화제 주입관의 직경을 50mm로 선정하고 주입관의 간격을 1-4m, 주입압을 100-220kPa로 변화시키면서 침투해석을 수행하였다. 해석결과에 따르면 중화제의 주입관 간격 1.0m 및 주입압 130kPa인 경우와 주입관 간격 2.0m 및 주입압 160kPa인 경우가 상대적으로 낮은 주입압에서 성토체 전체의 포화 도달시간이 빠른 것으로 나타났다. 그리고, 성토체 전체의 포화를 위한 중화제 주입관의 간격은 3m인 경우 130kPa에서 190kPa까지 다양한 주입압을 적용할 수 있으며, 성토체의 포화 도달시간은 주입압에 상관없이 유사한 것으로 나타났다. 따라서 경제성을 고려한 최적의 중화제 주입조건으로 주입관의 간격은 3.0m, 주입압은 130kPa로 선정하였다.

References

Azam, A. M., Cameron, D. A. and Rahman, M. M. (2013), "Model for prediction of resilient modulus incorporating matric suction for recycled unbound granular materials", Canadian Geotechnical Journal, Vol.50, pp.1143-1158. 10.1139/cgj-2012-0406

Coduto, D., Yeung, M. C. and Kitch, W. (2011), Geotechnical Engineering: Principles & Practices, 2nd Ed, Pearson, p.794

DIN 18130 (1998), Foundation Ground: Investigation of Soil Samples; Determination of the Hydraulic Conductivity, Part 1, Beuth Verlag GmbH: Berlin, Germany

GEO-SLOPE International Ltd, (2012), Seep/W, Groundwater Seepage Analysis, GEO-SLOPE International Ltd, Calgary, Alberta, Canada.

Gong, J. S., Kim, T. H. and Song, Y. S. (2021), "Case study on the treatment of acid rock drainage form an embankment with pyrite rocks", The Journal of Engineering Geology, Vol.31, No.4, pp.523-532. (in Korean with English Abstract)

Kalin, M., Wheeler, W. N. and Olaveson, M. M. (2006), "Response of phytoplankton to ecological engineering remediation of a Canadian shield lake affected by acid mine drainage", Ecological Engineering, Vol.28, pp.296-310. 10.1016/j.ecoleng.2006.08.010

Kim, J. G. (2007), "Acid drainage and damage reduction strategy in construction site: an introduction", Economic and Environmental Geology, Vol.40, No.5, pp.651-660. (in Korean with English Abstract)

Kim, J. G., Song, Y. S., Jeon, C. M. and Nam, I. H. (2014), "Assessment and stabilization embankment methods of acid rock drainage", The Magazine of the Korean Society of Civil Engineers, Vol.62, No.6, pp.36-41. (in Korean) 10.4491/KSEE.2014.36.10.679

Krahn, J. (2004), Seepage modeling with Seep/W, GEO-SLOPE International Ltd.

Lee, J. S., Kim, J. G., Park, J. S., Jeon, C. M. and Nam, I. H. (2013), "Assessment and damage reduction strategy of acid rock drainage in highway construction site: ○○ highway construction site", Economic and Environmental Geology, Vol.46, No.5, pp.411-424. (in Korean with English Abstract) 10.9719/EEG.2013.46.5.411

Lu, N. and Likos, W. J. (2004), Unsaturated Soil Mechanics, John Wiley & Sons, Inc., p.584

McCarthy, P. E. and David, F. (2006), Essentials of Soil Mechanics and Foundations, 7 edition, Prentice Hall, New York, p.864

Ministry of Construction and Transportation (2009), Standard Guidelines of Road Construction, p.500

Olsen, H. W., Willden, A. T., Klusalaas, N. J., Nelson, K. R. and Poeter, E. P. (1994), "Volume-controlled hydrologic property measurements in triaxial systems", Hydraulic Conductivity and Waste Contaminant Transport in Soils, ASTM STP 1142, Daniel, D.E. and Trautwein, S., eds, ASTM, pp. 482-504. 10.1520/STP23904S

Rojas, J. P., Ruge, J. C. and Carrillo, G. A. (2022), "Unsaturated hydraulic conductivity in composite porous media", Applied Sciences, Vol.12, No.9058. 10.3390/app12189058

Song, Y. S., Hwang, W. K, Jung, S. J. and Kim, T. H. (2012), "A comparative study of suction stress between sand and silt under unsaturated conditions", Engineering Geology, Vol.124, pp.90-97. 10.1016/j.enggeo.2011.10.006

Song, Y. S., Kim, J. G., Jeon, C. M. and Nam, I. H. (2014), "Embankment construction method using acid rock drainage", Geotechnical Engineering, Korean Geotechnical Society, Vol.30, No.4, pp.18-25. (in Korean)

Stumm, W. and Morgan, J. J. (1996), Aquatic Chemistry: Chemical equilibria and Rates in Natural Waters, 3th edition. John Wiley and Sons Inc., New York.

Walker, P. J. (1997), "Measurement of total suction and matric suction in pavement materials at Dandenong Alf site", Road and Transportation Research, ARRB, Vol.6, No.4, pp.48-58.

Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 22
No :4
Pages :73-82
Received Date : 2023-12-04
Revised Date : 2023-12-19
Accepted Date : 2023-12-20
DOI :https://doi.org/10.12814/jkgss.2023.22.4.073

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

All Issue