ANALISIS MODULUS DEFORMASI MASSA BATUAN PADA SEGMEN JALAN USAID KM 27 HINGGA KM 30 BERDASARKAN KLASIFIKASI MASSA BATUAN

Ibnu Rusydy, Nafisah Al-Huda, M Fahmi, Naufal Effendi, Abrar Muslim, Mirna Lubis

Abstract


Penelitian modulus deformasi dan klasifikasi massa batuan mengunakan sistem RMR (rock mass rating) dan GSI (geological strength index) telah dilakukan di Jalan Raya USAID km 27 hingga km 30. Lintasan jalan di daerah ini berada pada batuan yang mengalami deformasi akibat aktivitas tektonik sehingga pada bagian lereng badan jalan ditemukan rekahan-rekahan yang berpotensi longsor, maka diperlukan rekayasa lereng dengan menganalisis dan menilai klasifikasi massa batuan. Penelitian ini bertujuan untuk mengidentifikasi klasifikasi massa batuan dengan RMR (rock mass rating), GSI (geological strength index), dan besaran nilai modulus deformasi massa batuan yang terdapat pada batugamping lempungan. Metode penelitian yaitu dengan melakukan scanline untuk mengambil data orientasi struktur geologi untuk analisis kinematik lereng dan kondisi bidang diskontinuitas (kemenerusan, bukaan, kekasaran, isian, tingkat pelapukan dan kondisi keairan), termasuk kekuatan batuan utuh yang diambil dari lereng batuan untuk menghitung nilai RMR dan GSI. Pendekatan empiris dilakukan untuk mengestimasi nilai modulus deformasi berdasarkan nilai GSI. Hasil penelitian menunjukkan bahwa longsor batuan yang akan terjadi berdasarkan analisis kinematik adalah longsoran jenis planar, gulingan, dan baji. Nilai RMR masing-masing lereng 1, 2, 3 dan 4 adalah sebesar 60, 64, 60, dan 61, sementara nilai GSI sebesar 50, 51, 52 dan 54 secara berurutan. Nilai modulus deformasi massa batuan untuk batugamping lempungan sebesar 50 GPa untuk semua lereng. 

ABSTRACTS - Rock mass modulus deformation analysis in USAID highways segment km 27th to km 30th based on rock mass classifications.

Rock mass modulus deformation and rock mass classifications utilizing RMR (rock mass rating) and GSI (geological strength index) have been conducted in USAID Highways segment from km 27th to km 30th where is built on the rocks which are highly influenced by tectonic force and deformed by tectonic activity; hence, the rock on the slopes are fractured, folded and potentially to failure. These circumstances need a rock engineering approach by applying rock mass classification methods. This research aims to identify the rock mass classifications based on RMR, GSI, and to estimate the rock mass modulus deformation working on rock slope of argillaceous limestone. Scanline approach was utilized in structural geology data acquisition for rock slope kinematic analysis and joints condition (persistence, aperture, roughness, infilling, weathering, and watering) included the strength of intact rock is obtained from rock slope in calculating the RMR and GSI ratings. The empirical approach was deployed in estimating the rock mass modulus deformation based on GSI value. Rock slope kinematic analysis reveals the possibility of rock failure that will be occurred on the slopes are plane, toppling, and wedge failures. The total RMR ratings are 60, 64, 60, and 61 for slope 1, 2, 3, and 4, while the total GSI values are 50, 51, 52, and 54 respectively. Rock mass modulus deformation for argillaceous limestone in this study area is 50 GPa for every slope. 


Keywords


RMR, GSI, Modulus Deformasi Batuan, Lereng Batu, Aceh

References


Barber, A. J., 2000. The origin of the woyla terranes in sumatra dan the late mesozoic evolution of the sundaldan margin. Journal of Asian Earth Science, 18(6), 713-738.

Barber, A. J. dan Crow, M. J., 2005. Pre-Tertiary stratigraphy. In: A. J. Barber, M. J. Crow & J. S. Milson, eds. Sumatra: Geology, Resources, dan Tectonic Evolution. London: Geological Society, p. 41.

Barton, N. R., Lien, R. dan Lunde, J., 1974. Engineering classification of rock masses for the design of tunnel support. Rock Mech, 6(4), 189-239.

Basahel, H. dan Mitri, H., 2017. Application of rock mass classification systems to rock slope stability assessment: A case study. Journal of Rock Mechanics dan Geotechnical Engineering, 9(6), 993-1009.

Bennet, J. D., Bridge, D. M., Cameron, D. R., Djunuddin, A., Ghazali, S. A., Jeffrery, D. H., . . . Whdanoyo, R., 1981. Geologic 1:250,000 Map of Banda Aceh Quadrangle, Sumatra, Bandung: Geological Research dan Development Centar (GRDC).

Bieniawski, Z. T., 1989. Engineering Rock Mass Classification. New York: John Wiley & Sons.

Brown, E. T., 1981. Rock Characterization, Testing dan Monitoring, ISRM Suggested Methods. Oxford: Published for the Commission on Testing Methods, International Society for Rock Mechanics by Pergamon Press.

Cai, M., Kaiser, P. K., Uno, H., Tasaka, Y., dan Minami, M., 2004. Estimation of rock mass deformation modulus dan strength of jointed hard rock masses using the GSI system. International Journal of Rock Mechanics dan Mining Sciences, 41(1), 3-19.

Deere, D. U., 1968. Geological considerations. Dalam: Ambraseys, penyunt. Rock Mechanics in Engineering Practice. London: John Wiley, 1-20.

Fernández-Blanco, D., Philippon, M. dan Hagke, C. V., 2016. Structure dan kinematics of the Sumatran fault system in North Sumatra (Indonesia). Tectonophysics, 693, 453-464.

Grelle, G., Revellino, P., Donnarumma, A. dan Guadagno, F. M., 2011. Bedding control on ldanslides: a methodological approach for computer-aided mapping analysis. Nat. Hazards Earth Syst. Sci, 11, 1395–1409.

Gurocak, Z., Alemdag, S. dan Zaman, M. M., 2008. Rock slope stability dan excavatability assessment of rocks at the Kapikaya dam site, Turkey. Engineering Geology, Volume 96, pp. 17-27.

Hoek, E., 1994. Strength of rock dan rock masses. ISRM New Journal, 2(2), 4-16.

Hoek, E. dan Brown, E. T., 1997. Practical estimates of rock mass strength. International Journal of Rock Mechanics dan Mining Sciences, 34(8), 1165-1186.

Hoek, E. dan Brown, E. T., 2019. The HoekeBrown failure criterion dan GSIe2018 edition. Journal of Rock Mechanics dan Geotechnical Engineering, 11, 445-463.

Hoek, E., Carter, T. G. dan Diederichs, M. S., 2013. Quantification of the Geological Strength Index chart. San Francisco, American Rock Mechanics Association.

Lee, C.-Y. dan Wang, I.-T., 2011. Analysis of Highway Slope Failure by an Application of the Stereographic Projection. Taiwan, World Academy of Science, Engineering dan Technology.

McCaffrey, R., 2009. The Tectonic Framework of the Sumatran Subduction Zone. Annu. Rev. Earth Planet. Sci., Issue 37, 345–66.

Muksin, U., Rusydy, I., Erbas, K. dan Ismail, N., 2018. Investigation of Aceh Segment dan Seulimeum Fault by using seismological data; A preliminary result. s.l., IOP Publishing, 012031.

Pantelidis, L., 2009. Rock slope stability assessment through rock mass classification systems. International Journal of Rock Mechanics & Mining Sciences, 46, 315–325.

Priest, S. D., 1993. Discontinuity Analysis for Rock Engineering. London: Chapman dan Hall.

Rusydy, I., Al-Huda, N., Fahmi, M. dan Effendi, N., 2019. Kinematic Analysis dan Rock Mass Classifications for Rock Slope Failure at USAID Highways. Structural Durability & Health Monitoring, 13(4), 379-398.

Rusydy, I., Al-Huda, N., Jamaluddin, K., Sundary, D., dan Nugraha, G. S., 2017. Analisis Kestabilan Lereng Batu Di Jalan Raya Lhoknga Km 17, 8 Kabupaten Aceh Besar. RISET Geologi dan Pertambangan, 27(2), 145-155.

Rusydy, I., Idris, Y., Mulkal, Muksin, U., Cummins, P., Akram, M. N., dan Syamsidik., 2020. Shallow crustal earthquake models, damage, dan loss predictions in Bdana Aceh, Indonesia. Geoenvironmental Disasters, 7(8).

Rusydy, I., Muksin, U., Mulkal, Idris, Y., Akram, M. N., dan Syamsidik., 2018. The prediction of building damages dan casualties in the Kuta Alam sub district-Bdana Aceh caused by different earthquake models. s.l., AIP Publishing, p. 020012.

Rusydy, I., Sugiyanto, D., Satrio, L., Zulfahriza, Rahman, A., dan Mundanar, I., 2016. Geological Aspect of Slope Failure dan Mitigation Approach in Bireun-Takengon Main Road, Aceh Province, Indonesia. Aceh International Journal of Science dan Technology, 5(1), 30-37.

Siddique, T., Alam, M. M., Mondal, M. E. dan Vishal, V., 2015. Slope mass rating dan kinematic analysis of slopes along the national highway-58 near Jonk, Rishikesh, India. Journal of Rock Mechanics dan Geotechnical Engineering, 7, 600-606.

Sieh, K. dan Natawidjaja, D., 2000. Neotectonics of the Sumatran Fault. J. Geophys. Res, 105(B12), 28,295–28,326.

Singh, B. dan Goel, R. K., 1999. Rock Mass Classification (A Practical Approach in Civil Engineering). 1st ed. Oxford: Elsevler.

Sonmez, H. dan Ulusay, R., 1999. Modifications to the geological strength index (GSI) dan their applicability to stability of slopes. International Journal of Rock Mechanic dan Mining Science, 36(6), 743-760.

Wyllie, D. C. dan Mah, C. W., 2004. Rock Slope Engineering (Civil dan Mining). 4th ed. London dan New York: Spon Press.




DOI: http://dx.doi.org/10.14203/risetgeotam2020.v30.1073

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