Evaluasi Prediksi Penurunan Tanah Pada Timbunan Jalan Studi Kasus: Pembangunan jalan Tol Akses Patimban Paket 3 (STA 28+000 s.d 33+500)

Pratama, Bagas Hendi (2026) Evaluasi Prediksi Penurunan Tanah Pada Timbunan Jalan Studi Kasus: Pembangunan jalan Tol Akses Patimban Paket 3 (STA 28+000 s.d 33+500). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proyek pembangunan Jalan Tol Akses Patimban Paket 3 yang berdiri di atas lapisan tanah lunak (soft soil) menghadapi tantangan stabilitas dan penurunan tanah, di mana tercatat adanya diskrepansi signifikan antara prediksi penurunan pada desain awal dengan data monitoring lapangan aktual di STA 30+400. Penelitian ini bertujuan untuk mengevaluasi parameter tanah desain, memvalidasi prediksi penurunan tanah, serta melakukan optimasi desain perbaikan tanah. Analisis dilakukan dengan menginterpretasikan data monitoring Settlement Plate (SP-45) menggunakan Metode Asaoka untuk mendapatkan prediksi penurunan akhir aktual. Hasil observasi tersebut dikomparasikan dengan perhitungan ulang menggunakan metode analitis Terzaghi 1D dan pemodelan numerik Finite Element Method (FEM) menggunakan PLAXIS 2D. Pemodelan ini memanfaatkan parameter tanah terbarui yang dikorelasikan dari data uji Cone Penetration Test with Pore Pressure (CPTu) dan laboratorium. Selanjutnya, dilakukan analisis Multi-Criteria Analysis (MCA) untuk mengevaluasi efektivitas variasi kedalaman soil replacement berdasarkan aspek biaya, waktu, risiko stabilitas, dan workability. Hasil studi menunjukkan bahwa prediksi penurunan akhir menggunakan Metode Asaoka adalah sebesar 0,209 m. Nilai ini memiliki korelasi yang sangat tinggi dengan hasil analisis Terzaghi 1D sebesar 0,212 m dan analisis PLAXIS 2D sebesar 0,210 m. Validasi ini mengonfirmasi bahwa parameter tanah yang telah dikoreksi merepresentasikan kondisi in-situ dengan akurat. Berdasarkan evaluasi kriteria desain untuk memenuhi syarat laju penurunan (rate of settlement) pasca-konstruksi < 20 mm/tahun, diperlukan penyesuaian tinggi timbunan awal Hawal’ menjadi 5,63 m untuk mencapai tinggi timbunan desain 4,153 m dengan beban surcharge. Hasil analisis optimasi menunjukkan adanya trade-off antara efisiensi biaya dengan risiko stabilitas dan kemudahan pelaksanaan (workability) akibat cuaca. Berdasarkan pembobotan kriteria, direkomendasikan optimasi pengurangan kedalaman soil replacement dari desain awal 2,5 m menjadi 2,0 m sebagai opsi paling efisien dan aman secara teknis.
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The construction of the Patimban Access Toll Road Package 3, located on soft soil deposits, faces significant challenges regarding stability and soil settlement. A significant discrepancy was recorded between the settlement prediction in the initial design and the actual field monitoring data at STA 30+400. This study aims to evaluate the design soil parameters, validate soil settlement predictions, and perform design optimization for soil improvement. The analysis was conducted by interpreting Settlement Plate (SP-45) monitoring data using the Asaoka Method to predict the actual final settlement (Sc). These results were compared with recalculations performed using the Terzaghi 1D analytical method and Finite Element Method (FEM) numerical modeling using PLAXIS 2D. The modeling utilized updated soil parameters correlated from Cone Penetration Test with Pore Pressure (CPTu) and laboratory test data. Furthermore, a Multi-Criteria Analysis (MCA) was conducted to evaluate the effectiveness of soil replacement depth variations based on cost, time, stability risk, and workability aspects. The study results indicate that the final settlement predicted by the Asaoka Method was 0.209 m. This value closely aligns with the results from the Terzaghi 1D analysis (0.212 m) and PLAXIS 2D analysis (0.210 m). This validation confirms that the corrected soil parameters accurately represent the actual in-situ conditions. Based on the evaluation of design criteria to meet the post-construction rate of settlement requirement of < 20 mm/year, the initial embankment height Hinitial’ needs to be adjusted to 5.63 m to achieve the design embankment height of 4.153 m with surcharge load. The optimization analysis revealed a trade-off between cost efficiency and stability risks as well as weather-related workability. Based on the criteria weighting, it is recommended to optimize the soil replacement depth from the initial design of 2.5 m to 2.0 m as the most efficient and technically safe option.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Soil Settlement, Preloading, Soil Replacement, Asaoka Method, Finite Element Method (FEM), Design Optimization.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TE Highway engineering. Roads and pavements > TE175 Road and highway design
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Bagas Hendi Pratama
Date Deposited:	26 Jan 2026 09:09
Last Modified:	26 Jan 2026 09:09
URI:	http://repository.its.ac.id/id/eprint/130368

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