Advertisement

Indian Geotechnical Journal

, Volume 48, Issue 4, pp 663–676 | Cite as

Continuum and Discontinuum Analysis of Rock Caverns

  • A. Usmani
  • S. Pal
  • A. Nanda
Original Paper
  • 59 Downloads

Abstract

Over the last decades, constructions of large underground rock caverns are experiencing a rapid development across the globe. However design and construction of these structures is a complex and challenging task, specifically with limitations of limited investigations data and presence of many uncertainties. Rock mass parameters along with joint configuration such as persistence, spacing and strength of the joints are the main factors which significantly modify stresses and displacements in the vicinity of the openings. Thus, a detailed cavern stability assessment based on field data collection from the excavated cavern’s face is critically important. This paper discusses continuum and discontinuum modelling of underground rock caverns based on case study of crude oil storage project located on southern coast of India. Critical points of observation for these two types of analysis are reviewed in reference to results of the case study. Data obtained from geotechnical monitoring of underground rock cavern is also compared and discussed with the results obtained from both continuum and discontinuum analysis for better understanding of the same. The results obtained from this study indicate that inclusion of discontinuities in rock mass for numerical modelling captures essential instability conditions around the cavern while continuum representation gives a more idealised illustration of the instability. Observed displacement values in most of the cases lie in between the calculated displacement values of continuum and discontinuum analysis.

Keywords

Caverns Stability Joints Monitoring Continuum Discontinuum 

Notes

Acknowledgements

The authors would like to thank the management of Engineers Indian Limited for granting permission to publish this paper.

References

  1. 1.
    Gerrard CM (1982) Elastic models of rock masses having one, two and three sets of joints. Int J Rock Mech Min Sci Geomech Abstr 19:15–23CrossRefGoogle Scholar
  2. 2.
    Sharma KG (2009) Numerical analysis of underground structures. Indian Geotech J 39(1):1–63MathSciNetGoogle Scholar
  3. 3.
    Singh B (1973) Continuum characterization of jointed rock masses Part I–the constitutive equations. Int. J Rock Mech Sci Geomech 10:311–335CrossRefGoogle Scholar
  4. 4.
    Hormazabal E, Pereira J, Barindelli G, Alvarez R (2014) Geomechanical evaluation of large excavations at the new level mine—El Teniente. In: 3RD international symposium on block and sublevel caving, pp 486–500Google Scholar
  5. 5.
    Sitharam TG (2007) Equivalent continuum analyses of jointed rock mass: a practical approach, Chapter No 22. In: Ramamurthy T (ed) Book-engineering in rocks for slopes, foundations and tunnels. Prentice Hall of India, New Delhi, pp 518–544. ISBN 978-81-203-3275-1Google Scholar
  6. 6.
    Mandal A, Chakravarthy CP, Nanda A, Rath R, Usmani A (2013) Analysis and design approach for large storage caverns. Int J Geomech ASCE 13(1):69–75CrossRefGoogle Scholar
  7. 7.
    T, Fumio I (1999) Comparison of computational models for jointed rock mass through analysis of large scale cavern excavation. In: Proceedings of the ninth international congress on rock mechanics, Paris, France, ISRM, vol. 1, pp 389–93Google Scholar
  8. 8.
    Usmani A, Nanda A, Mandal A, Jain SK (2013) Interaction mechanism between two large rock caverns. Int J Geomech ASCE, Int J Geomech ASCE 15(1):06014014CrossRefGoogle Scholar
  9. 9.
    Goodman R, Taylor R, Brekke T (1968) A model for mechanics of jointed rock. J Soil Mech Found Division 94:637–659Google Scholar
  10. 10.
    Bhasin R, Hoeg K (1998) Parametric study for a large cavern in jointed rock using a distinct element model (UDEC-BB). Int J Rock Mech Min Sci 35:17–29CrossRefGoogle Scholar
  11. 11.
    Cundall PA, Hart RD (1993) Numerical modelling of discontinua. Comprehensive rock engineering. In: Hudson JA (ed) Analysis and design methods, vol 2. Pergamon Press, Oxford, pp 231–261CrossRefGoogle Scholar
  12. 12.
    Gui YL, Bui HH, Kodikara J, Zhang QB, Zhao J, Rabczuk T (2016) Modelling the dynamic failure of brittle rocks using a hybrid continuum-discrete element method with a mixed-mode cohesive fracture model. Int J Impact Eng 87:146–155CrossRefGoogle Scholar
  13. 13.
    Itasca Consulting Group, Inc (2008) UDEC-Universal distinct element code online manual, vol 1. Itasca Consulting Group, Inc, Minneapolis, MinnesotaGoogle Scholar
  14. 14.
    Jiao Y, Zhang XL, Zhang HQ, Huang GH (2014) A discontinuous numerical model to simulate rock failure process. Geomech. Geoeng 9(2):133–141CrossRefGoogle Scholar
  15. 15.
    Kulatilake PHSW, Ucpirti H, Wang S, Radberg G, Stephansson O (1992) Use of the distinct element method to perform stress analysis in rock with non-persistent joints and to study the effect of joint geometry parameters on the strength and deformability of rock masses. Rock Mech Rock Eng 25:253–274CrossRefGoogle Scholar
  16. 16.
    Zhou H, Gao Y, Zhang C, Yang F, Hu M, Liu H, Jiang Y (2018) A 3D model of coupled hydro-mechanical simulation of double shield TBM excavation. Tunn Undergr Space Technol 71:1–14CrossRefGoogle Scholar
  17. 17.
    Bjureland W, Spross J, Johansson F, Prästings A, Larsson S (2017) Reliability aspects of rock tunnel design with the observational method. Int J Rock Mech Min. 98:102–110CrossRefGoogle Scholar
  18. 18.
    Lü Q, Low BK (2011) Probabilistic analysis of underground rock excavations using response surface method and SORM. Comput Geotech. 38(8):1008–1021CrossRefGoogle Scholar
  19. 19.
    Pal S, Rath R, Shahri V, Nanda A (2013) Treatment of geological hotspots in large underground storage caverns. J Eng Geol (JOEG) 38(2):41–48Google Scholar
  20. 20.
    Barton N (2002) Some new Q-value correlations to assist in site characterization and tunnel design. Int J Rock Mech Min Sci 39:185–216CrossRefGoogle Scholar
  21. 21.
    Hoek E, Brown ET (1997) Practical estimates or rock mass strength. Int J Rock Mech Min Sci Geomech 34(8):1165–1186CrossRefGoogle Scholar
  22. 22.
    Phase 2.0. (2007) Computer software. Rocscience, TorontoGoogle Scholar
  23. 23.
    Hoek E, Carranza-Torres CT, Corkum B (2002) Hoek–Brown failure criterion—2002 edition. In: Hammah R, Bawden W, Curran J, Telesnicki M (eds). Proceedings of the Fifth North American rock mechanics symposium (NARMS-TAC), University of Toronto Press, Toronto, pp 267–273Google Scholar
  24. 24.
    Marinos V, Marinos P, Hoek E (2005) The geological strength index: applications and limitations. Bull Eng Geol Environ 64(1):55–65CrossRefGoogle Scholar
  25. 25.
    Bieniawski ZT (1989) Engineering rock mass classifications: a complete manual for engineers and geologists in mining, civil, and petroleum engineering. Wiley, New YorkGoogle Scholar
  26. 26.
    Pain A, Kanungo DP, Sarkar S (2014) Rock slope stability assessment using finite element based modelling—examples from the Indian Himalayas. Geomech Geoeng 00:1–16Google Scholar
  27. 27.
    Tiwari G, Latha GM (2016) Seismic stability analysis of a Himalayan rock slope. Rock Mech Rock Eng 49:2075–2097CrossRefGoogle Scholar
  28. 28.
    Barton N, Choubey V (1977) The shear strength of joints in theory and in practice. Rock Mech 10:1–65CrossRefGoogle Scholar
  29. 29.
    Barton N (1976) The shear strength of rock and rock joints. Int J Rock Mech Min Sci Geomech 13:1–24CrossRefGoogle Scholar
  30. 30.
    Barton N, Bandis S (1990) Review of predictive capabilities of JRC-JCS model in engineering practice. In: Barton N, Stephansson O (eds) Proceedings of the international symposium on rock joints, Loen, Norway. Balkema, Rotterdam, pp 603–10Google Scholar

Copyright information

© Indian Geotechnical Society 2018

Authors and Affiliations

  1. 1.Engineers India LimitedNew DelhiIndia

Personalised recommendations