Analisis Implementasi dan Kualitas Kolom Soil-Cement Metode Rapid Jet Grouting untuk Stabilitas Galian Stasiun Bawah Tanah MRT Jakarta
DOI:
https://doi.org/10.25170/jpk.v3i03.7555Keywords:
Ground Improvement, Alluvial Clay, Jet Grouting, Rapid Jet Method, Unconfined Compression StrengthAbstract
The construction of the underground stations for the Mass Rapid Transit (MRT) Phase 2 (CP202) Project in Jakarta faces a serious geotechnical constraint: the presence of very soft Alluvial Clay 1 (AC1) layers (c_u as low as 20–35 kPa), which threatens the stability of deep excavations. This study analyzes the implementation and quality verification of Ground Improvement (GI) using the Jet Grouting Rapid (R2) method at the Sawah Besar Station site. The Rapid Jet method was strategically selected to produce large-diameter soil-cement columns (ϕ3,5m) under high operational pressure (30–34 MPa), aiming to increase the Unconfined Compression Strength (UCS) and form a base seal.
Quality control was rigorously performed using UCS testing according to the ASTM D2166/D2166M-16 standard on core samples from the Check Hole (CH-01). The data indicate that strict process compliance with the critical injection parameters (30–34 MPa) successfully produced soil-cement columns meeting the design strength criteria. This success effectively increased the excavation's Safety Factor and mitigated the risks of basal heave and water seepage. The main finding emphasizes integrated quality validation, where technical success is guaranteed by absolute adherence to the critical input energy (jet pressure) to ensure the method's effectiveness in challenging AC1 soil conditions.
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