Analysis of Soft Soil Improvement in the Probolinggo-Banyuwangi Toll Road Development Project Package 3 Using Various Alternative Soil Improvement Methods
Abstract
The construction of Probolinggo–Banyuwangi Toll Road Package 3 faces geotechnical challenges due to variations in the thickness of compressible soft soil layers, which may cause excessive settlement and embankment instability. This study aims to analyze the influence of existing soil conditions on settlement and embankment stability and to determine the most appropriate ground improvement methods based on variations in compressible soil thickness. The research employed a quantitative method using secondary data, including Standard Penetration Test (SPT) data, embankment material parameters, ground improvement parameters, and seismic data for pseudostatic analysis. The N-SPT values were corrected and correlated into soil parameters, which were then modeled using PLAXIS 2D finite element software with the Hardening Soil model. The analysis results indicate that at STA 42+675, with a soft soil thickness of 5.5 m, the settlement difference under existing conditions was 16.22 cm and was successfully reduced to 7.9 cm after applying a combination of bamboo piles and bamboo mattress. At STA 45+700, with a soft soil thickness of 12 m, the existing condition experienced collapse during the embankment construction stage, whereas the combination of Prefabricated Vertical Drain (PVD) and preloading produced stable conditions with a settlement difference of 6.54 cm and a seismic safety factor of 1.375. This study concludes that selecting ground improvement methods based on the thickness of compressible soil layers can effectively improve embankment stability and control settlement.
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References
Irsyam, M., Krisnanto, S. (2008), “Pengujian Skala Penuh dan Analisis Perkuatan Cerucuk Matras Bambu Untuk Timbunan Badan Jalan di Atas Tanah Lunak di Lokasi Tambak Oso, Surabaya”. Forum Teknik Sipil No. 18, 667.
Salsabila, H. (2005). “Analisis Stabilitas dan Penurunan Tanggul Laut Dengan Penggunaan Matras Bambu Pada Jalan Tol Semarang-Demak (Stability and Settlement Analysis of Coastal Embankment With Bamboo Mattress Reinforcement on Semarang Demak Toll Road). Skripsi, Fakultas Teknik Sipil dan Perencanaan, Program Studi Teknik Sipil, Universitas Islam Indonesia, Yogyakarta.
Pusat Studi Gempa Nasional. (2017). “Peta Sumber dan Bahaya Gempa Indonesia Tahun 2017”. Pusat Penelitian dan Pengembangan Perumahan dan Permukiman, Bandung.
Indraratna, B., Bamunawita, C., Redana, I., & McIntosh, G. (2003). “Modelling of prefabricated vertical drains in soft clay and evaluation of their effectiveness in practice”. Faculty of Engineering – Papers.
Hird C. C., Pyrah I. C., & Russel D. (1992). “Finite element modelling of vertical drains beneath embankments on soft groiund”. Geotechnique, Vol. 42, No. 3, Hal 499-511.
Permana, A., Despa, D., & Septiana, T. (2023). “Metode Cerucuk Matras Beton Sebagai Perkuatan Daya Dukung Tanah di Area Transisi Antara Area Timbunan di Area Tanah Lunak Dengan Struktur”. Seminal Nasional Insinyur Profesional (SNIP), Vol. 3, No. 1.
Badan Standardisasi Nasional. (2017). “Persyaratan Perancangan Geoteknik”. SNI 8460:2017, Badan Standardisasi Nasional, Jakarta.
Authors
Copyright (c) 2026 Muhammad Salman Mukhtar, Yerry Kahaditu Firmansyah, Bagas Aryaseta, Miguel Felix Wijaya
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