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All Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Faizah, Yuni
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology

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Analisis Kualitas dan Perkuatan Terowongan Eksplorasi Uranium Eko Remaja Kalan, Kalimantan Barat menggunakan Metode RMR (Rock Mass Rating) Faizah, Yuni; Cakrabuana, Wira; Kamajati, Dhatu; Rahmawati, Putri
EKSPLORIUM Vol. 41 No. 1 (2020): MEI 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.1.5859

Abstract

Tunnel for Exploration of Uranium Eko Remaja Kalan (TEURK) in West Kalimantan, built-in 1980, is one of the uranium deposit research facilities in Indonesia. The tunnel penetrated Eko Remaja Hill along 618 m, from Remaja to TRK-7 access. Uranium mineralization in this area controlled by dense stockwork veins on metasilt and metasandstone rocks. The high-dense geological structures create some weak zones in the tunnel. These zones are potentially causing rocks and soil slides. Temporary supports made of wood-piles were installed in these zones to support the tunnel. Currently, these piles are not capable at the tunnel, so that rocks and soil slides occurred inside the tunnel. The research aimed to determine the quality of actual rock mass and determine the appropriate type of reinforcement to keep the tunnel safe. Schmidt hammer and scanline surveys on the unsupported zone (50–297 m and 355–538 m depth) carried out to collect the classification parameter data of Rock Mass Rating (RMR). The measurement result shows that the rock mass of TEURK on the depth has an RMR value of 52–71 (fair-good). Reinforcement recommendations for the tunnel are rock bolts and conventional shotcretes installation.
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.
Co-Authors Cakrabuana, Wira Dhatu Kamajati, Dhatu Dinata, Indra Andra Putri Rahmawati