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Universitas Cenderawasih
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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 Abda Abda Agustinus Agustinus Agustinus Agustinus Agustinus Agustinus Giai AKBAR SILO Allo Sarira Pongsapan Allo, Elisabet Payung Allo, Elisabeth Payung Anas, Nur Ayu Anastasia Sri Werdani Anastasia Sri Werdhani Anastasia Sri Werdhani Anastasya S. Werdhani Anne Sihombing Arifia Ekayuliana Armansyah Halomoan Tambunan Bernathius Julison David Mangallo Dionisius Desriadi Banda Eka Lambda Irianto, Eka Lambda Ekayuliana, Arifia Endang Hartiningsi Endang Hartiningsih Endang Hartiningsih Enos Karapa Enos Tambing Haurissa, Calvion Jean Haurissa, Jusuf Herbert Innah Indrajati, Rahmat Johni J Numberi Karapa, Enos Kiman Siregar Kiman Siregar, Kiman Kristofel Rumar Lazarus Ramandei Lefaan, Yosef Lekito, Hanro Manalu, Janviter Mangalo, David Mangopo, Dultudes Marpaung, Johana Marthen Liga Marthen Liga Matius R. Manalu Membala, Semuel Boron Mickael Ruben Kaiway Mohammad Arafah Mollet, Julius Ary Nourish C. Griapon Nourish Griapon Obed Rante Allo Oktaviani, Theresia W. Oktavianus Kati Oktavianus Kati Oscar Wambrauw Palamba, Phiter Patabang, Djuarensi Pither Palamba Pither Palamba Pither Palamba Pither Palamba Pius, Obia Prihananto Setiadji Radite Praeko Agus Setiawan Ranteallo, Obet Rombe Allo Ruben M. Kaiwai Rustam Efendi Safanpo, Apolo Samson Fernando Weyai Samuel Parlindungan Siregar Samuel Parlindungan Siregar Sebayang, Renaldi Selyus Rantepulung Siregar, Januar Parlaungan Siregar, Samuel Sri Werdhani, Anastasia Suparno Syilius Rantepulung Tendinus Werenengga Theresia W. Oktaviani Thomas Pagasis Tiper K. M. Uniplaita Tosuli, Yohanis Tangke Uniplaita, Tiper Uniplaita, Tiper Korneles Muwarberto Wardiman Werdhani, Anastasia Sri Wilfriedf Wanane Yakobus Kariongan Yane A. Ansanay Yane Oktovina Ansanay Yohanis Wanane Yonas, Marcelino Novryanto Yosef Lefaan