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All Journal Rekayasa Sipil Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi
Rayhansah, Rina Rebut
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Civil Engineering, Building, Construction & Architecture Engineering

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Microbially Induced Calcite Precipitation (MICP) Meningkatkan Stabilitas Lereng Tanah Lempung Plastisitas Rendah Khusna Ali, Mahardi Kamalika; Rayhansah, Rina Rebut
Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi Vol 9, No 2 (2025): JTS TEKNOLOGI SIPIL
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ts.v9i2.23900

Abstract

Indonesia sebagai wilayah tropis memiliki curah hujan tinggi. Kondisi ini membuat tanah lempung berplastisitas rendah (CL), yang dominan mengandung mineral kaolinit mudah kehilangan kekuatan saat kadar air meningkat. Kondisi ini meningkatkan risiko keruntuhan lereng. Metode stabilisasi konvensional mahal dan berdampak lingkungan. Microbially Induced Calcite Precipitation (MICP) menjadi alternatif ramah lingkungan karena menghasilkan kalsium karbonat (CaCO₃) yang dapat mengikat partikel tanah. Penelitian bertujuan untuk mengevaluasi pengaruh MICP biostimulasi terhadap perilaku lereng tanah lempung melalui model skala kecil. Model lereng dibuat dari tanah CL dalam box kaca berukuran 60 × 14 × 25 cm dengan sudut 60°. Dua kondisi diuji, yaitu normal (air) dan MICP (larutan sementasi) dengan inkubasi 7 hari pada suhu ruangan. Dilakukan pengujian pembebanan serta uji geser langsung pada tiga tegangan normal. Parameter yang dianalisis meliputi load–deformation, modulus elastisitas (E₀, E₅₀, Eₜ), kohesi (c), sudut geser dalam (φ), serta validasi statistik dengan ANOVA. Hasil menunjukkan MICP mampu meningkatkan respon beban sebesar 105,4 % dengan p-value 0,000. Nilai E₅₀ meningkat 24.5%, dan Eₜ meningkat sebesar 35%. Kohesi meningkat sebesar 96,9%, sedangkan sudut geser meningkat sebesar 11% dengan p-value 0,001. Temuan ini menunjukkan MICP mampu meningkatkan kapasitas respon beban lereng, kekakuan, dan kuat geser tanah serta berpotensi sebagai teknologi stabilisasi lereng tanah lempung yang efektif berkelanjutan.
Microbially Induced Calcite Precipitation (MICP) Biostimulation Increases Slope Safety Factor on Low Plasticity Soils Ali, Mahardi Kamalika Khusna; Candra, Agata Iwan; Rayhansah, Rina Rebut
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.2

Abstract

Low-plasticity clay (CL) soils are commonly found in tropical regions and generally have high water content, which reduces shear strength and lowers the slope safety factor (Fs). Conventional stabilization methods such as cement and fly ash are considered environmentally unfriendly because they produce high carbon emissions. Microbially Induced Calcite Precipitation (MICP) has emerged as a sustainable alternative for enhancing soil strength through the formation of biologically induced calcite. However, most previous MICP studies on slopes have focused on sandy soils, erosion control, and bioaugmentation. Therefore, it is necessary to investigate the application of Biostimulated MICP on high-moisture CL soils that represent tropical conditions and their relationship with slope Fs. This study aims to evaluate the effectiveness of biostimulated MICP on the stability of high-moisture CL soil slopes. Small-scale slopes were created in boxes with a 60° angle using the air pluviation method. The biostimulation solution used included urea, CaCl?, CH?COONa, NaOH, and sugarcane molasses to activate indigenous urease-producing bacteria. Testing included direct shear tests and slope-model loading tests with incubation times of 0 and 7 days. Fs analysis used an infinite-slope approach under steady-state seepage conditions. The results showed a 90.15% increase in cohesion and a 37.05% increase in internal friction angle, thereby increasing Fs to 88.72% after 7 days of MICP treatment. The results of the slope loading test showed a 105.41% increase in slope bearing capacity. These results indicate that the increase in cohesion and friction angle due to MICP is reflected in the slope's load-carrying capacity and in an increase in the Fs value. The findings indicate that biostimulated MICP has the potential as a sustainable slope stabilization technique and is suitable for tropical soil conditions.
Co-Authors Agata Iwan Candra Mahardi Kamalika Khusna Ali