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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Eduvest - Journal of Universal Studies
Khalilullah, Hanif
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Education Health Professions Neuroscience Physics Social Sciences

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Effect Of The Utilization Of Chicken Egg Shell Waste As A Lime Mixture On Ph Parameters In Mine Acid Water Saputro, Kristanto Jiwo; Suharyadi, Heru; Yusuf, Yusmardhany; Khalilullah, Hanif; Sari, Sindi Mutika; Muhammad, Bagoes Nur; Yusuf, Nur Reza Muhammad
Eduvest - Journal of Universal Studies Vol. 4 No. 11 (2024): Journal Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v4i11.44760

Abstract

Acid mine drainage (AMD) is a significant environmental impact of coal mining, particularly in open-pit mining systems. To neutralize AMD acidity, the commonly used method involves adding quicklime (CaO). This study aims to evaluate the effectiveness of using eggshells, which contain calcium carbonate (CaCO3), as an additive to quicklime in AMD treatment. Experiments were conducted with varying doses of ground and calcined eggshells at 150°C and 300°C. The results indicate that calcining eggshells at higher temperatures enhances their effectiveness in increasing AMD pH. Without calcination, the pH increased by 1.87%, while calcination at 150°C and 300°C resulted in pH increases of 1.87% and 8.6%, respectively. However, excessive doses of eggshells may decrease pH. Therefore, using calcined eggshells as an additive to quicklime offers a more economical and environmentally friendly solution for AMD treatment.
Analisis Elasto Plastik Bukaan Silindris Berbasis Hoek-Brown pada Terowongan Kalilingseng Khalilullah, Hanif; Saptono, Singgih
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1550

Abstract

The stability of tunnels excavated within heterogeneous rock masses necessitates analytical approaches capable of realistically representing elasto-plastic behavior. This study evaluates the elasto-plastic response of the Kalilingseng Tunnel (Kulon Progo) employing the Hoek–Brown (H–B) failure criterion and the analytical formulation of Carranza-Torres and Fairhurst (CTF) for cylindrical openings. Rock-mass parameters were derived from field-based classification (GSI = 50) and back-analysis using RocLab, yielding mb = 1.509, s = 0.003866, a = 0.5057, Erm = 1.76 GPa, and ν = 0.28. The in-situ stresses at a depth of 34 m indicate σv = 0.637 MPa, σh = 0.322 MPa, and a normalized stress S0 = 0.0252. Analytical results show an onset of plasticity characterized by a critical internal support pressure Pi* = 0.00213, a relative plastic zone radius ξ = 1.010 (≈1% beyond the excavation boundary), and a nondimensional radial closure Ur = 0.000487, corresponding to an actual displacement ur ≈ 0.73 mm for a tunnel radius b = 1.5 m. The wall-stress profile yields σr(b) = 0.0017 MPa and σθ(b) = 0.958 MPa, both well below the rock-mass strength. The resulting Ground Reaction Curve (GRC) exhibits a smooth, nonlinear decay without any abrupt deformation, consistent with the mild yielding regime described in the nondimensional CTF framework. These findings confirm that the rock mass remains inherently stable, implying that support strategies required for the tunnel are primarily deformation-control measures rather than structural reinforcement.
Co-Authors Heru Suharyadi Kristanto Jiwo Saputro Muhammad, Bagoes Nur Sari, Sindi Mutika Singgih Saptono, Singgih Yusuf, Nur Reza Muhammad Yusuf, Yusmardhany