DOI QR코드

DOI QR Code

Effect of Joint Spacing on the Earth Pressure Against the Support System in a Jointed Rock Mass

Son, Moorak;Adedokun, Solomon

  • 투고 : 2015.10.02
  • 심사 : 2015.11.27
  • 발행 : 2016.01.01

초록

This study examined the magnitude and distribution of earth pressure on the support system in a jointed rock mass due to the different joint spacing as well as varying the rock type and joint condition (joint shear strength and joint inclination angle). Based on a physical model test and its numerical simulation, a series of numerical parametric analyses were conducted using a discrete element method. The results showed that the magnitude and distribution of earth pressure were strongly affected by the different joint spacing as well as the rock type and joint condition. In addition, the study results were compared with Peck's earth pressure for soil ground, which indicated that the earth pressure in a jointed rock mass could be considerably different from that in soil ground. The study suggests that the joint spacing as well as the rock type and joint condition are important factors affecting the earth pressure in a jointed rock mass and they should be considered when designing a support system in a jointed rock mass.

키워드

Rock excavation;Support system;Earth pressure;Joint spacing;Rock type;Joint condition

참고문헌

  1. Bieniawski, Z. T. (1976), Rock mass classification in rock engineering, John Wiley & Sons, New York, pp. 97-106.
  2. Chae, Y. S. and Moon, I. (1994), Earth pressure on retaining wall by considering local soil condition, Korean Geotechnical Society '94 fall conference paper, pp. 129-138 (in Korean).
  3. Goodman R. E. (1989), Introduction to rock mechanics, Wiley & Sons, New York, pp. 179-217.
  4. Hashash, Y. M. A. and Whittle, A. J. (2002), Mechanism of load transfer and arching for braced excavations in clay, Journal of Geoteh. and Geoenviron. Eng., Vol. 128, No. 3, pp. 187-197. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:3(187)
  5. Hoek, E. and Brown, E. T. (1988), Underground excavations in rock, Institution of Mining and Metallurgy, London, pp. 131-178.
  6. Jeong, E. T. and Kim, S. G. (1997), Case study of earth pressure distribution on excavation wall of multi-layered soil. Korean Geotechnical Society '97 spring conference paper, pp. 78-80 (in Korean).
  7. Laio, S. S. C. and Neff, T. L. (1990), Estimating lateral earth pressure for design of excavation support, Proceedings, Design and Performance of earth retaining structures, ASCE special conference, Ithaca, New York, pp. 489-509.
  8. Lambe, T. W. and Whitman, R. V. (1978), Soil mechanics, SI version, John Wiley & Sons Inc., New York, pp. 185-194.
  9. Peck, R. B. (1969), Deep excavations and tunneling in soft ground. state-of-the-art report, Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, State-of-the Art Volume, pp. 225-290.
  10. Potts, D. M. and Fourie, A. B. (1986), A numerical study of the effect of wall deformation on earth pressures. Intern. Journal of Numerical Ana. Methods in Geomech. Vol. 10, No. 4, pp. 383-405. https://doi.org/10.1002/nag.1610100404
  11. Son, M. (2013), Earth pressure on the support system in jointed rock mass, Canadian Geotech. Journal, Vol. 50, No. 5, pp. 493-502. https://doi.org/10.1139/cgj-2012-0147
  12. Son, M. and Adedokun, S. I. (2015). Effect of support characteristics on the earth pressure in a jointed rock mass, Canadian Geotech. Journal, Vol. 52, No. 12, pp. 1956-1967. https://doi.org/10.1139/cgj-2014-0437
  13. Son, M. and Park, J. (2014), Physical model test and numerical simulation of excavation walls in jointed rock masses, Canadian Geotech. Journal, Vol. 51, No. 5, pp. 554-569. https://doi.org/10.1139/cgj-2013-0081
  14. Tschebotarioff, G. P. (1973), Foundations, Retaining and Earth Structures. 2nd Ed., MGH, pp. 35-90.
  15. Universal Distinct Element Code (UDEC, 2004), User's Manual, Itasca Consulting Group, Minneapolis, Minnesota, U.S.A, pp. 1-100.
  16. Wong, I. H., Poh, T. Y. and Chuah, H. L. (1997), Performance of excavations for depressed expressway in Singapore, Journal of Geoteh. and Geoenviron. Eng., Vol. 123, No. 7, pp. 617-625. https://doi.org/10.1061/(ASCE)1090-0241(1997)123:7(617)
  17. Worden, F. T. and Achmus, M. (2013), Numerical modeling of three-dimensional active earth pressure acting on rigid walls, Computer and Geotechnics, Vol. 51, pp. 83-90. https://doi.org/10.1016/j.compgeo.2013.02.004
  18. Yoo, C. S. and Kim, Y. J. (2000), Deep excavation in soil, including rock with layers on retaining wall and apparent horizontal displacement of earth pressure, Journal of Korean Geotechnical Society, Vol. 16, No. 4, pp. 43-50 (in Korean).