Studi Perbandingan Alternatif Pernaikan Tanah Lunak Tebal Dan Tipis Pada Tol-Kayu-Agung-Palembang-Betung Di STA 52+200-52+300 Dan 67+400-67+500

William, Michael (2026) Studi Perbandingan Alternatif Pernaikan Tanah Lunak Tebal Dan Tipis Pada Tol-Kayu-Agung-Palembang-Betung Di STA 52+200-52+300 Dan 67+400-67+500. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Jalan Tol Trans-Sumatra Ruas Kayu Agung–Palembang–Betung (KAPB) menghadapi permasalahan geoteknik akibat keberadaan tanah lunak tebal pada STA 52+200–52+300 dan tanah lunak tipis pada STA 67+400–67+500. Kondisi tersebut berpotensi menyebabkan pemampatan yang besar, waktu konsolidasi yang lama, serta Rate of Settlement (ROS) yang tidak memenuhi persyaratan sehingga diperlukan metode perbaikan tanah yang sesuai. Penelitian ini bertujuan mengevaluasi kebutuhan metode replacement pada tanah lunak tipis serta membandingkan efektivitas kombinasi preloading dengan Prefabricated Vertical Drain (PVD) dan timbunan ringan menggunakan mortar busa pada tanah lunak tebal. Analisis dilakukan menggunakan data sekunder dengan mengevaluasi besar pemampatan, waktu konsolidasi, ROS, stabilitas timbunan, kebutuhan perkuatan geotekstil, dan biaya material. Hasil penelitian menunjukkan bahwa timbunan rencana pada tanah lunak tipis menghasilkan pemampatan sebesar 0,1072–0,1256 m dengan nilai ROS yang belum memenuhi persyaratan sehingga diperlukan metode replacement berdasarkan evaluasi sesuai Pedoman Kimpraswil No. Pt T-8-2002-B. Pada tanah lunak tebal, metode preloading–PVD dan timbunan ringan menggunakan mortar busa sama-sama memenuhi persyaratan penurunan. Peningkatan persentase mortar busa mengurangi nilai pemampatan, ROS, dan kebutuhan replacement. Selain itu, variasi mortar busa 60% memenuhi persyaratan tanpa memerlukan replacement, sedangkan variasi 20% dan 40% masih memerlukan replacement pada lokasi tertentu. Hasil analisis stabilitas menunjukkan bahwa kebutuhan perkuatan geotekstil bervariasi antara 55,60–261,60 m, sedangkan beberapa alternatif tidak memerlukan perkuatan. Dari aspek biaya material, metode preloading–PVD menjadi alternatif paling ekonomis pada STA 52+200 dan STA 52+250 dengan biaya masing-masing sebesar Rp3.938.984.200,00 dan Rp3.774.391.400,00, sedangkan timbunan ringan menggunakan mortar busa 20% menjadi alternatif paling ekonomis pada STA 52+300 dengan biaya sebesar Rp2.438.103.200,00. Dengan demikian, pemilihan metode perbaikan tanah direkomendasikan berdasarkan kondisi tanah serta hasil evaluasi teknis dan biaya pada setiap lokasi.
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The construction of the Kayu Agung–Palembang–Betung (KAPB) section of the Trans-Sumatra Toll Road faces geotechnical challenges due to the presence of thick soft soil at STA 52+200–52+300 and shallow soft soil at STA 67+400–67+500. These conditions may result in excessive settlement, prolonged consolidation time, and a Rate of Settlement (ROS) that does not satisfy the design criteria, requiring appropriate ground improvement methods. This study evaluates the necessity of the replacement method for shallow soft soil and compares the effectiveness of the preloading method combined with Prefabricated Vertical Drains (PVD) and lightweight embankments using foam mortar for thick soft soil. The analysis was conducted using secondary data by evaluating settlement, consolidation time, ROS, embankment stability, geotextile reinforcement requirements, and material costs. The results show that the planned embankment on shallow soft soil produced settlements of 0.1072–0.1256 m, with ROS values exceeding the allowable limit, indicating the need for the replacement method. For thick soft soil, both the preloading–PVD method and lightweight foam mortar embankments satisfied the settlement criteria. Higher foam mortar percentages reduced settlement, ROS, and the required replacement thickness. In addition, the 60% foam mortar alternative satisfied the design requirements without replacement, whereas the 20% and 40% alternatives still required replacement at specific locations. Stability analysis showed that the required geotextile reinforcement ranged from 55.60 to 261.60 m, whereas some alternatives required no reinforcement. From the material cost perspective, the preloading–PVD method was the most economical alternative at STA 52+200 and STA 52+250, with material costs of IDR 3,938,984,200.00 and IDR 3,774,391,400.00, respectively, while the 20% foam mortar alternative was the most economical at STA 52+300, with a material cost of IDR 2,438,103,200.00. Therefore, the selection of the appropriate ground improvement method should be based on site-specific soil conditions while considering both technical performance and material costs.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Tanah lunak, replacement, preloading, Prefabricated Vertical Drain (PVD), mortar busa, Rate of Settlement (ROS), stabilitas timbunan. soft soil, replacement, preloading, Prefabricated Vertical Drain (PVD), foam mortar, Rate of Settlement (ROS), embankment stability.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Michael William
Date Deposited:	28 Jul 2026 07:37
Last Modified:	28 Jul 2026 07:37
URI:	http://repository.its.ac.id/id/eprint/138626

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