A Numerical Modeling Study for Determining the Optimal Depth of Grout Curtain in Foundation and Abutments of Karun 4 Dam

نوع مقاله : مقاله پژوهشی

نویسندگان

Department of Mining, Imam Khomeini International University, Iran

چکیده

Some experimental relations have been developed for determining the grout curtain depth, but these relations cannot be applied to any dam with any geological condition. Therefore, the effect of the grout curtain depth on seepage through foundation and abutments of each dam should be studied separately. To examine this parameter in Karun 4 dam, the numerical modeling method was applied using FLAC in a 2-dimensional modeling process. Permeability coefficient is an important parameter in numerical modeling. In this research, the experimental relationships for Lugeon values and permeability coefficient were used to determine the required permeability. A transverse section was used to model each of the abutments and the foundation of Karun 4 dam. The grout curtain was designed as a wall with a very low permeability at different depths. After modeling the grout curtain with various lengths, the curtain depth was determined based on seepage level, curtain flow efficiency, drilling-injection costs, and value of seepage water. The grout curtain depths were calculated to be 70, 184, and 104 at the foundation, left abutment, and right abutment, respectively. Also analysis of the pore water pressure and flow lines shows when the curtain is sewed to the Pabdeh Formation, we have the high efficiency in the grout curtain.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Numerical Modeling Study for Determining the Optimal Depth of Grout Curtain in Foundation and Abutments of Karun 4 Dam

نویسندگان [English]

  • Mehdi Hosseini
  • Shirvan Sazandeh
Department of Mining, Imam Khomeini International University, Iran
چکیده [English]

Some experimental relations have been developed for determining the grout curtain depth, but these relations cannot be applied to any dam with any geological condition. Therefore, the effect of the grout curtain depth on seepage through foundation and abutments of each dam should be studied separately. To examine this parameter in Karun 4 dam, the numerical modeling method was applied using FLAC in a 2-dimensional modeling process. Permeability coefficient is an important parameter in numerical modeling. In this research, the experimental relationships for Lugeon values and permeability coefficient were used to determine the required permeability. A transverse section was used to model each of the abutments and the foundation of Karun 4 dam. The grout curtain was designed as a wall with a very low permeability at different depths. After modeling the grout curtain with various lengths, the curtain depth was determined based on seepage level, curtain flow efficiency, drilling-injection costs, and value of seepage water. The grout curtain depths were calculated to be 70, 184, and 104 at the foundation, left abutment, and right abutment, respectively. Also analysis of the pore water pressure and flow lines shows when the curtain is sewed to the Pabdeh Formation, we have the high efficiency in the grout curtain.

کلیدواژه‌ها [English]

  • grout curtain
  • permeability
  • Numerical modeling
  • Karun 4 Dam
  • FLAC

مراجع

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[3] Aalianvari, A., Katibeh, H., Sharifzadeh, M., A new approach for computing permeability of fault zones case study: the upper reservoir of Azad pumped-storage power station in Iran. ArchMin Sci, 2010. 55(3): p. 605–621.
[4] Baghbanan, A., Jing, L., Hydraulic properties of fractured rockmasses with correlated fracture length and aperture. Int J RockMech Min Sci, 2007. 44(5): p. 704–719.
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[6] Wilson, D., and Dreese, D., Grouting Technologies for Dam Foundations. Proceedings of the Annual Conference, ASDSO, Las Vegas, Nevada, 1998.
[7] Nonveiller, E., Injection engineering operations. publishing Zayandab consulting engineers Co., 1995.
[8] Najjar, Y.M., Naouss, W.A., Seepage design charts for flat bottom dams on heterogeneous media. Int.J.for Numerical and Analytical Methods in Geomechanics, 1995. 19: p. 637-651.
[9] Ewert, F. K., Permeability, Groutability and Grouting of Rocks. related to dam sites. Dam engineering, 1997. VIII(1): p. 31-76.
[10] Sivakan, N., Permeability and Seepage, Chapter 7, http://www.geoengineer.org/files/siva-seepage.pdf. 2005.
[11] Aalianvari, A., Optimum depth of grout curtain around pumped storage power cavern based on geological conditions. Bull EngGeol Environ, 2014. 73( 3): p. 775–780.
[12] MahabGhodss consulting engineering Co., Technical report of Karun 4 dam and power plant. 1997.
[13] MahabGhodss consulting engineering Co., Rock mechanics report of Karun 4 dam and power plant. 2002.
[14] MahabGhodss consulting engineering Co., Engineering geology report of Karun 4 dam and power plant. 1996.
[15] Itasca Consulting Group, Flac 2 D, Fast Lagrangian Analysis of Continua, User's Manual Version 5. 2004.
[16] EM 1110-2-1901, Seepage control in Earth Foundations, chapter 9. USBR Reports, 1986.
[17]Website:http://www.magiran.com/npview.asp?ID=1877070.
[18]Website:http://www.amirparizad.com/index.php?option=com_content&task=view&id= 3252&Itemid=36.

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  • تاریخ دریافت: 28 آذر 1394
  • تاریخ بازنگری: 03 اردیبهشت 1395
  • تاریخ پذیرش: 04 اردیبهشت 1396

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