Environmental Earth Sciences

, Volume 61, Issue 4, pp 741–755 | Cite as

Geotechnical assessments of the stability of slopes at the Cakmakkaya and Damar open pit mines (Turkey): a case study

  • Fehmi Arikan
  • Fatih Yoleri
  • Sureyya Sezer
  • Dincer Caglan
  • Bengu Biliyul
Original Article

Abstract

The on-site observations, monitoring data, and results of back analyses of failures showed that large-scale failures occurred along both the interconnected sliding surfaces, consisting of (a) discontinuities in the dacites and the contact zone and (b) the circular surfaces through the weathered soil-like dacites at the Cakmakkaya and Damar open pit mines. Surface water infiltration through the weathered soil-like material after a short duration of rainfall contributed to the circular-shaped failures. After a heavy rainy period, an increase in the groundwater table above the contact zone played a major role in the initiation of bi-planar wedge failures. In addition, the stability of the slopes is likely to have been controlled by the orientation of this zone. The results of back analyses indicated that the shear strengths of the soil-like materials in the weathered dacites and the contact zone had reduced to their residual values at the time of initial sliding. The flattening of the slope angles with an effective surface drainage and long-term monitoring of the groundwater level is proposed as the most suitable remedial measure.

Keywords

Bi-planar wedge failure Back analyses Shear strength Weathering Slope stability 

References

  1. Arıkan F, Ulusay R, Aydın N (2007) Characterization of weathered acidic volcanic rocks and a weathering classification based on a rating system. Bull Eng Geo Environ 66(44):415–430CrossRefGoogle Scholar
  2. ASTM (American Society for Testing and Materials) (1985) Annual book of ASTM standards-soil and rock; building stone, construction, Sect 4, vol 04.09. ASTM PublicationGoogle Scholar
  3. ASTM (American Society for Testing and Materials) (1990) Annual book of ASTM standards-soil and rock; dimension stone, geosynthetics, Sect 4, vol 04.08. ASTM PublicationGoogle Scholar
  4. ASTM (American Society for Testing and Materials) (1994) Annual book of ASTM standard-soil and rock; building stone, construction. Sect 4, vol 04.08, ASTM PublicationGoogle Scholar
  5. Barton N (1976) The shear strength of rock and rock joints. Int J Rock Mech Min Sci Geomech Abstr 13:255–279CrossRefGoogle Scholar
  6. Barton N, Choubey V (1977) The shear strength of rock joints in theory and practice. Rock Mech 10:1–54CrossRefGoogle Scholar
  7. Bishop AW (1955) The use of the slip circle in the stability analysis of slopes. Geotechnique 5:7–17CrossRefGoogle Scholar
  8. BSI (British Standards Institution) (1990) British standard methods of test for soils for civil engineering purpose; part 2, classification tests. BSI Publication, 30–39Google Scholar
  9. Deere DU, Miller RP (1966) Classification and index properties of intact rock. Techical report, AFWL-TR-65-116, AF Special Weapons Center, Kirtland Air Force Base, New MexicoGoogle Scholar
  10. Deere DU, Patton FD (1971) Slope stability in residual soils. In: Proceedings of the 4th Pan American conference on soil mechanics and foundation engineering, San Juan, Puerto Rico, 1, pp 87–170Google Scholar
  11. Goodman RE (1980) Introduction to rock mechanics. Willey, New York, pp 254–285Google Scholar
  12. Hoek E (1987) General two-dimesional slope stability analysis. In: Brown ET (ed) Analytical and computational methods in engineering mechanics. Allen and Unwin, London, pp 95–128Google Scholar
  13. Hoek E, Bray JW (1981) Rock slope engineering, 3rd edn. Institution of Mining and Metallurgy, Stephen Austin and Sons Ltd, LondonGoogle Scholar
  14. ISRM (International Society for Rock Mechanics) (1981) Rock characterization, testing and monitoring—ISRM suggested methods. In: Brown ET (ed) Pergamon Press, OxfordGoogle Scholar
  15. Leonards GA (1962) Foundation engineering. McGraw Hill, Tokyo, p 1136Google Scholar
  16. Martin CD, Kaiser PK (1984) Analysis of a rock slope with internal dilation. Can Geotech J 21(4):605–620CrossRefGoogle Scholar
  17. Sancio RT (1981) The use of back calculations to obtain the shear and tensile strength of weathered rocks. In: Proceedings of International Symposium on Weak Rocks, Tokyo, vol 2, pp 647–652Google Scholar
  18. Sarma SK (1973) Stability analysis of embankments and slopes. Geotechnique 23(3):423–433CrossRefGoogle Scholar
  19. Skempton AW (1953) The colloidal activity of clay. In: Proceedings of the 3rd international conference on soil mechanics and foundation engineering, Switzerland, p 57Google Scholar
  20. USBR (United States Bureau of Reclamation) (1974) Earth manual: a water resources technical publication. Denver, Colorado, p 810Google Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Fehmi Arikan
    • 1
  • Fatih Yoleri
    • 2
  • Sureyya Sezer
    • 2
  • Dincer Caglan
    • 2
  • Bengu Biliyul
    • 2
  1. 1.Jeoloji Etütleri DairesiMaden Tetkik ve Arama Genel MüdürlüğüBalgat, AnkaraTurkey
  2. 2.Fizibilite Etütleri DairesiMaden Tetkik ve Arama Genel MüdürlüğüBalgat, AnkaraTurkey

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