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All Journal Dinamika Bahasa dan Budaya Ekuilibrium : Jurnal Ilmiah Bidang Ilmu Ekonomi Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Pengabdian Masyarakat Sains dan Teknologi Jurnal Ilmiah Ilmu Terapan Universitas Jambi Jurnal Sains dan Teknologi Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri
Endang Hartiningsih
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Other

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MINERALOGICAL ANALYSIS OF ROCK WEATHERING AND ITS INFLUENCE ON SLOPE FAILURE ALONG THE JAYAPURA CITY RING ROAD Karapa, Enos; Joni, Joni; Hartiningsih, Endang; Yonas, Marcelino Novryanto; Indrajati, Rahmat; Patabang, Djuarensi; Anas, Nur Ayu
Jurnal Ilmiah Ilmu Terapan Universitas Jambi Vol. 10 No. 2 (2026): Volume 10, Nomor 2, April 2026
Publisher : LPPM Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jiituj.v10i2.54453

Abstract

Slope failure along the Jayapura City Ring Road persisted despite shotcrete reinforcement, indicating that instability is not controlled solely by slope geometry or surface confinement. Field evidence points to weakening within foliated metamorphic rocks affected by tropical weathering, where mineral alteration progressively modifies the internal structure. This study examines how mineralogical transformations govern subsurface degradation and contribute to failure beneath reinforced slopes. A case study approach was applied using two representative samples (ST-01 and ST-02) obtained directly from the failure zone. Petrographic analysis of ~30 μm thin sections was conducted to evaluate mineral textures, fabric orientation, and alteration pathways. X-ray diffraction (XRD) was used to identify and semi-quantify the mineral phases, including albite, quartz, chlorite, muscovite, sericite, and magnetite. Subsurface conditions were assessed using ADMT resistivity profiling across a frequency range of 0.0001–10,000 Hz, reaching depths of approximately 300 m. The results indicate a mineralogical transition from a wollastonite–actinolite–chlorite assemblage in ST-01 to a chlorite–muscovite–sericite-dominated system in ST-02. The XRD data show a decrease in albite from ~19.74% to ~11.61%, while an unresolved fraction exceeding ~20% suggests the presence of poorly crystalline phases. Petrographic observations revealed that chlorite and sericite were concentrated along foliation and microfractures. The resistivity data identified a low-resistivity zone (10–20 Ωm) at depths of ~10–60 m, corresponding to altered and fluid-influenced domains. These findings indicate that weathering reduces cohesion along structurally controlled planes while preserving partial framework integrity, shifting the locus of failure to the subsurface beneath the shotcrete layer.
Co-Authors Adifian Tanga Datu Agustinus Giai AKBAR SILO Anas, Nur Ayu Detevince Butu Frans Simbol Tambing Griapon, Nourish Indrajati, Rahmat Jhon Awawata Johni J Numberi Joni Karapa, Enos Karl Karoluz Wagab Meak La Ode Alibin Akbar Tuminda Lefaan, Yosef Manalu, Janviter Marthen Liga Maya Falentina I Msiren Mega Fatimah Rosana Mickael Ruben Kaiway Mollet, Julius Ary Patabang, Djuarensi Pither Palamba Rahmat Indrajati Ranteallo, Obet Rumar, Kristofel Safanpo, Apolo Samuel Parlindungan Siregar Selyus Rantepulung Theresia Wuri Oktaviani Tiper Korneles Muwarberto Uniplaita Wambrauw, Oscar O. Werdani, Anastasia Sri Yane Oktovina Ansanay Yohanis Wanane Yonas, Marcelino Novryanto