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All Journal Journal of Geoscience, Engineering, Environment, and Technology Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Dinata, Indra Andra
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Analysis of Rock Mass Quality and Support Requirements Using Q-System – Case Study: Kalan Uranium Exploration Tunnel, West Kalimantan, Indonesia Cakrabuana, Wira; Dinata, Indra Andra; Faizah, Yuni; Kamajati, Dhatu; Rahmawati, Putri
EKSPLORIUM Vol. 46 No. 2 (2025): NOVEMBER 2025
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2025.13575

Abstract

The Kalan uranium exploration tunnel was one of the nuclear minerals research facilities in Indonesia. This 618 m long tunnel, located in West Kalimantan, Indonesia, was built on Eko Remaja Hill and operated from 1980-2021. In this tunnel, uranium mineralization occurs as irregular veins (stockworks) in metasiltstone and metapelite. The high density of these veins causes the formation of several weak zones in the tunnel. These weak zones cause rock and soil failures at several locations in the tunnel. The study aims to evaluate the quality of the rock mass surrounding the tunnel and determine the support requirements necessary to prevent further structural failures. Scanline surveys were carried out in several zones that have not experienced failures to obtain Q-system parameters. Based on the results of the analysis, the rock mass that makes up the Kalan tunnel has a Q value of 0.61–48.22, so that it belongs to the class of very poor-very good rocks. By plotting the Q value with its equivalent dimension (ED) on the rock support chart, it is estimated that the support required by the tunnel is average bolt spacing without fiber-reinforced sprayed concrete. The ultimate pressures of the roof and wall support can bear are 0.04–0.24 MPa and 0.03–0.17 MPa, respectively.
Comparison of Liquefaction Potential Analysis Methods Based on CPTu data on Reclamation Island, Pantai Indah Kapuk, DKI Jakarta, Indonesia Rahman, Erfandi; Sadisun, Imam Ahmad; Dinata, Indra Andra
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): Article in Press - JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

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Abstract

Liquefaction analysis in reclaimed areas has been intensively conducted because reclamation materials are generally non-cohesive and susceptible to liquefaction. Indonesia, known as the “Ring of Fire,” has high seismic potential that can trigger liquefaction. The cone penetration test (CPT) is one of the methods used to obtain subsurface soil layer data, which are subsequently applied for liquefaction analysis and evaluation of the geological conditions of the study area. This study compares three currently developing methods for liquefaction analysis. The results of soil layer analysis in the study area indicate three variations of sediment types, namely sand, silt, and clay. The method proposed by Boulanger and Idriss (2014) yields FS values < 1 for materials with fines content (FC) greater than 30%, which are considered susceptible to liquefaction. In contrast, the Robertson (2009) method also produces FS values < 1 for materials with FC > 30%, while the method proposed by Moss et al. (2006) results in FS values > 1 for materials with FC < 30%. The comparison of the three methods generally shows that the study area has a high liquefaction potential in clean sand materials at depths ranging from 4.5 to 15 m below the ground surface.
Co-Authors Cakrabuana, Wira Dhatu Kamajati, Dhatu Faizah, Yuni Putri Rahmawati Rahman, Erfandi Sadisun, Imam Ahmad