Aulus, Daryl Xavier (2026) Evaluasi Potensi Likuifaksi Dan Stabilitas Struktur Eksisting Serta Alternatif Perencanaan Timbunan, Sistem Perkuatan Tanah, Dan Pondasi Tangki Pada Area Terminal Curah Cair Morowali, Sulawesi Tengah. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pembangunan fasilitas Terminal Curah Cair dan storage tank di kawasan industri Morowali memerlukan kajian geoteknik yang komprehensif karena lokasi berada pada lingkungan pesisir dengan muka air tanah dangkal dan stratigrafi yang didominasi tanah granular lepas sehingga berpotensi mengalami likuifaksi. Penelitian ini bertujuan menganalisis karakteristik tanah dan potensi likuifaksi, merencanakan perbaikan tanah, mengevaluasi shore protection eksisting, serta merencanakan sistem shore protection, timbunan, dan pondasi tangki yang memenuhi persyaratan stabilitas dan keamanan struktur. Analisis dilakukan berdasarkan data investigasi tanah, parameter sifat fisik dan mekanik tanah, serta pembebanan struktur menggunakan metode analitis dan pemodelan numerik. Hasil analisis menunjukkan bahwa lokasi penelitian terbagi menjadi empat zona area tangki dan satu zona sisi laut yang didominasi tanah pasir dengan nilai Safety Factor (SF) terhadap likuifaksi sebesar 0,64–1,09, sehingga berpotensi mengalami likuifaksi hingga kedalaman sekitar 14 m. Perbaikan tanah menggunakan metode vibroflotation/vibrocompaction dengan pola segitiga, jarak antar titik 1,85 m, dan target Relative Density (Dr) sebesar 80% berhasil meningkatkan kepadatan tanah sehingga seluruh zona memiliki SF terhadap likuifaksi sebesar 5,08–12,98 dan memenuhi kriteria tidak mengalami likuifaksi. Evaluasi shore protection eksisting menunjukkan bahwa sistem Corrugated Concrete Sheet Pile (CCSP) dengan perkuatan vibro stone column dan revetment memiliki faktor keamanan konstruksi sebesar 1,98–3,84, namun panjang turap eksisting 6,00 m belum memenuhi kebutuhan hasil analisis sebesar 10,43 m, serta elevasi puncak +3,20 mLWS masih lebih rendah dibanding elevasi rencana +7,73 mLWS. Oleh karena itu, direncanakan sistem shore protection baru menggunakan gabion wall dan perkuatan geotekstil, dengan elevasi +7,73 mLWS dan panjang total geotekstil 390,30 m yang menghasilkan SF sebesar 1,50–1,88. Pondasi tangki direncanakan menggunakan spun pile berdiameter 1,2 m dengan pile cap berbentuk lingkaran. Perbaikan tanah menghasilkan desain pondasi yang lebih efisien melalui pengurangan panjang spun pile dari 20 m menjadi 18 m serta pengurangan jumlah tiang pada sebagian besar tangki, sementara seluruh konfigurasi tetap memenuhi persyaratan kapasitas dukung, penurunan, dan kekuatan struktur.
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The construction of a Liquid Bulk Terminal and storage tanks in the Morowali Industrial Area requires a comprehensive geotechnical assessment due to the site's coastal environment, shallow groundwater table, and stratigraphic profile dominated by loose granular soils that are susceptible to liquefaction. This study aims to analyze soil characteristics and liquefaction potential, design ground improvement, evaluate the existing shore protection system, and develop a new shore protection system, embankment, and tank foundation that satisfy stability and structural safety requirements. The analyses were conducted using geotechnical investigation data, soil physical and mechanical properties, and structural loading through analytical methods and numerical modeling. The results indicate that the study area can be divided into four tank zones and one coastal zone, all predominantly consisting of sandy soils with liquefaction Safety Factor (SF) values ranging from 0,64 to 1,09, indicating liquefaction susceptibility to a depth of approximately 14 m. Ground improvement using the vibroflotation/vibrocompaction method, arranged in a triangular pattern with 1,85 m spacing and a target Relative Density (Dr) of 80%, successfully increased soil density, resulting in liquefaction safety factors ranging from 5,08 to 12,98, thereby eliminating the liquefaction potential. Evaluation of the existing shore protection system, consisting of Corrugated Concrete Sheet Piles (CCSP) reinforced with vibro stone columns and revetment, showed construction safety factors ranging from 1,98 to 3,84. However, the existing sheet pile length of 6,00 m was insufficient compared with the required embedment depth of 10,43 m, and the existing crest elevation of +3,20 mLWS was lower than the required design elevation of +7,73 mLWS. Consequently, a new shore protection system comprising a gabion wall and geotextile reinforcement was designed with a crest elevation of +7,73 mLWS. The geotextile reinforcement, with a total length of 390,30 m, achieved safety factors ranging from 1,50 to 1,88, satisfying the required stability criteria. The storage tank foundations were designed using 1,2 m diameter spun piles with circular pile caps. Ground improvement produced a more efficient foundation design by reducing the required pile length from 20 m to 18 m and decreasing the number of piles for most tanks, while all foundation configurations satisfied the requirements for bearing capacity, settlement, and structural strength.
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