The Engineering Characteristics and Classifications of Rock Masses along Road Section from Prambanan to Patuk, Yogyakarta, Indonesia

https://doi.org/10.22146/jag.58034

Aisyah Shahirah Juhari(1), I Gde Budi Indrawan, Dr.(2*), Wahyu Wilopo(3)

(1) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada
(2) Geological Engineering Departement, Universitas Gadjah Mada
(3) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada
(*) Corresponding Author

Abstract


Several attraction places and agriculture area that essentials for tourism and villager to do their activities are located approximately 6 km along the road of Candi Ijo to Ngoro-Oro in between Prambanan and Patuk sub-districts, Yogyakarta, Indonesia. Many jointed rock masses along the road have the potential to fail. This paper describes the rock mass characteristic and quality determined using the Geological Strength Index (GSI) and Rock Mass Rating (RMR) classifications. The rock mass characteristic and quality were essentially the preliminary results of a study to evaluate stability of the rock slopes along the road of Candi Ijo to Ngoro-Oro. Field observation and laboratory tests were carried out to determine parameters of the GSI and RMR.  The results show that the slopes in the study area consisted of tuffaceous sandstone, vitric tuff, lithic tuff, cemented tuffaceous sandstone, lapilli tuff, subarkose, laminated mudrock, and laminated tuffaceous sandstone. The intact rocks were classified as weak to very strong. The research area consisted of three rock mass qualities, namely fair rock mass quality having GSI between 30 and 45 and RMR between 41 and 60,  good rock mass quality having GSI between 46 to 65 and RMR between 61 and 80, and very good rock mass quality having GSI > 65 and RMR between 81-100. The relationship between GSI and RMR obtained in this study was in good agreement with that proposed by Hoek et al. (1995).

Keywords


Geological Strength Index (GSI); rock mass quality; Rock Mass Rating (RMR); Semilir Formation; slope stability

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References

Basahel, H. and Mitri, H. (2017) Journal of Rock Mechanics and Geotechnical Engineering Application of Rock Mass Classification Systems to Rock Slope Stability Assessment : A Case Study, Journal of Rock Mechanics and Geotechnical Engineering. Vol.9, no.6, p. 993-1009.

Bieniawski, Z. T. (1989) Engineering Rock Mass Classifications: A Complete Manual for Engineers and Geologists in Mining, Civil and Petroleum Engineering. New York: Wiley.

Broch E. and Franklin, J.A. The Point Load Strength Test. Int. Journal Rock Mech. Min. Sci 9, 1972, pp. 669-697

Hoek, E., Kaiser, P. K. and Bawden W.F. (1995) Support of Underground Excavations in Hard Rock. Rotterdam: Balkema.

Hudson, J. A and Harrison, J. P. (1997) Engineering Rock Mechanics: An Introduction to the Principles.

ISRM. 1978. Suggested methods for the quantitative description of discontinuities in rock masses. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 15: 319–368

Marinos, P. and Hoek, E. (2000) GSI-A Geologically Friendly Tool for Rock Mass Strength Estimation, In Proc. Geoeng2000 Conference. Melbourne.

Marinos, P. and Hoek, E. (2001) Estimating The Geotechnical Properties of Heterogeneous Rock Masses such as Flysch, Bulletin of Engineering Geology and The Environment, Vol.60, no.2, p. 85–92.

Pettijohn, F. J. (1975) Sedimentary Rocks. 3rd Edn. New York: Harper & Row Publishers.

Priangga, E., Pramumidjojo, S. and Satyarno, I. (2018) The Risk of Slope Stability Due To Earthquake (Case Area In Patuk District, Gunung Kidul Regency), Semesta Teknika, vol.21, p. 93–105.

Priest, S. D. and Hudson, J. A. (1976) Discontinuity Spacings in Rock, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, vol 13, No.5, p. 135-148.

Santosa, L. W. (2005) Identification of Land Degradation and Method of Solution in Zone of Baturagung Hill at Gunung Kidul Regency, Forum Geografi, vol.19, p.30–54.

Schmid, R. (1981) Descriptive Nomenclature and Classification of Pyroclastic Deposits and Fragments - Recommendations of the IUGS Subcommission on the Systematics of Igneous Rocks, Geologische Rundschau, vol.70, no.2, p. 794–799.

Surono, Toha, and B., Sudarno, I. (1992) Geological Map of the Surakarta Giritontro Quadrangles, Jawa, Lembar (Quadrangle) 1408-3 & 1407-6, Skala (Scale) 1:100.000. Pusat Penelitian dan Pengembangan Geologi. Departemen Pertambangan dan Energi.



DOI: https://doi.org/10.22146/jag.58034

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