Mineralogical Control of Rock Slope Stability Assessment of Columnar Jointed Basaltic Rock Masses in The Cengkehan River Valley, Indonesia

Rakhman, Arie Noor and Zakaria, Zufialdi and Muslim, Dicky and Haryanto, Iyan and Maulana, Fivry Wellda (2020) Mineralogical Control of Rock Slope Stability Assessment of Columnar Jointed Basaltic Rock Masses in The Cengkehan River Valley, Indonesia. In: Book of Abstracts 5th International Conference of Geological Engineering Faculty (ICGEF 2020). The International Institute of Knowledge Management (TIIKM) Sri Lanka, Pitakotte, p. 39. ISBN 978-955-3605-80-1

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Abstract

The research area is located in Cengkehan River, Bantul Regency, Yogyakarta Special Region, Indonesia. There are several unstable rock slopes, where rock masses move through rock discontinuities into rock falls. This study aims to determine the relationship between the influence of mineralogical control and stability assessment of rock slopes by using RMR and SMR for columnar jointed basaltic rock masses. In basalt, many joints are found with three joint sets plus random joints. Physical characteristics of the cliff section are commonly found in core stones. Some core stones are found as a spheroidal weathering formation, wherein it measured between 10 and 40 cm in diameter. Based on the RMR value between 38 and 54 and the SMR value between 53 and 69. In the weathered joint walls, dominantly the composition of plagioclase minerals that have been altered to smectite (8% - 26.67%). Several joints are filled with material rich in iron sulfide minerals that have been oxidized to sulfate mineral, natrojarosite, with a composition reaching 44.64%. The presence of joint-filling minerals is commonly found on the lower cliffs where the RMR and SMR values are low.

Item Type: Book Section
Subjects: Q Science > QE Geology
Divisions: Fakultas Teknologi Mineral > Teknik Geologi (S1)
Depositing User: Arie Noor Rakhman
Date Deposited: 31 Jan 2022 04:18
Last Modified: 31 Jan 2022 04:18
URI: http://eprints.akprind.ac.id/id/eprint/774

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