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All Journal Portal: Jurnal Teknik Sipil Journal of Infrastructure and Civil Engineering Indonesian Geotechnical Journal
Herwan Dermawan
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Materials Science & Nanotechnology Transportation

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Analysis of Soil Improvement Through PVD and Vacuum Preloading with Several Equivalent Permeability Methods Gusnadi, Zakwan; Iman Handiman; Herwan Dermawan; Asrinia Desilia
Indonesian Geotechnical Journal Vol. 3 No. 1 (2024): Vol. 3, No. 1, April 2024
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v3i1.92

Abstract

Vacuum preloading combined with prefabricated vertical drain (PVD) is one of the common soft soil improvement methods. Soft soils often pose significant problems in construction projects due to their low shear strength and high compressibility, leading to settlement issues and potential structural instability. The PVD combined with vacuum preloading method addresses these problems by accelerating the consolidation process and minimizing settlement during service period. The acceleration occurs due to the presence of PVD, allowing dissipation of excess pore water in horizontal direction towards the PVD. Thereafter, the water in the PVD is drained to the surface. When modelled in 2D, PVD behaves as a continuous drain in the plane strain direction, causing the flow conditions to deviate from the actual conditions. To address this issue, equivalent soil permeability values is required, allowing the 2D model to produce results closely resembling the actual conditions. This research explores the improvement of PVD vacuum preloading through three equivalent permeability approaches. Utilizing field monitoring data, which includes settlement measurements from settlement plates, changes in pore water pressure recorded by piezometers, and lateral deformation data captured by inclinometers, the study evaluates the effectiveness of these approaches. Comparative analyses with field monitoring data reveal that Indraratna equivalent permeability method has the best fit. The integration of PVD and vacuum preloading, coupled with the refinement of equivalent permeability methodologies, offers a promising solution for addressing soft soil problems in geotechnical engineering. This research contributes to the practical application of these methods in construction projects, emphasizing their potential to enhance soil stabilization and reduce settlement-related risks.
Redesain dan Evaluasi Kinerja Fondasi Piled Raft Pada Tanah Lempung Berlapis Menggunakan MIDAS GTS NX Nazla Nabilla; Herwan Dermawan
Journal of Infrastructure and Civil Engineering Vol. 6 No. 2 (2026)
Publisher : Program Studi Teknik Sipil Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/jice.v6i2.200

Abstract

Proyek ini merupakan pembangunan gedung pendidikan bertingkat tinggi yang pada desain awal menggunakan fondasi tiang pancang. Pada tahap pengujian Pile Driving Analyzer (PDA), hammer mengalami kerusakan berupa pecah; evaluasi selanjutnya mengindikasikan adanya ketidaksesuaian antara interpretasi desain awal dan kondisi aktual lapangan. Kondisi tersebut mendorong dilakukannya redesain fondasi agar tetap memenuhi persyaratan kapasitas dan kemampulayanan. Penelitian ini mengevaluasi sistem piled raft pada tanah lempung berlapis melalui verifikasi analitis dan analisis elemen hingga tiga dimensi. Konfigurasi fondasi terdiri atas raft berukuran 74 m × 28 m dengan tebal 2 m dan 846 spun pile berdiameter 0,50 m serta panjang 12 m yang menerima beban layan 182.581,28 kN. Perhitungan analitis menghasilkan kapasitas izin tiang tunggal 627,81 kN, pembagian beban Poulos–Davis–Randolph sebesar 76,91% pada kelompok tiang dan 23,09% pada raft, serta penurunan 8,12 cm. Analisis MIDAS GTS NX menghasilkan penurunan maksimum 6,684 cm, rasio penurunan diferensial 0,000340, gaya tekan maksimum 541,749 kN pada kepala tiang dan 543,659 kN sepanjang elemen, serta rasio pemanfaatan maksimum 0,866. Kelompok tiang memikul 74,04% beban dan raft 25,96%. Perbedaan load sharing terhadap PDR sebesar 2,87 poin persentase menunjukkan pola distribusi beban yang konsisten. Hasil tersebut memenuhi kriteria evaluasi geoteknik yang digunakan.
Stress and Deformation Analysis of Existing Underground Pipelines During Soft Soil Consolidation with Prefabricated Vertical Drains and Vacuum Preloading Adli Ahmad Rizaldy; Herwan Dermawan
Portal: Jurnal Teknik Sipil Vol 17, No 2 (2025): October Edition
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/portal.v17i2.7775

Abstract

Abstract — This study evaluates vacuum-assisted soft-clay improvement with Prefabricated Vertical Drains (PVD) and its implications for an in-service buried pipeline along a planned toll-road corridor. A descriptive–quantitative approach with PLAXIS 3D couples ground consolidation and soil–pipeline interaction: PVDs are modeled as line drains on a 1.5 m grid to 22 m depth beneath a permeable sand blanket; a 50 kPa vacuum is applied, and embankment loading is staged in four 1 m lifts (design surcharge 123.6 kPa, vacuum-reduced equivalent ≈ 73.6 kPa, fill height ≈ 4 m). Results show rapid dissipation of excess pore pressure and attainment of ~90% consolidation, with total settlement ≈ 3.10 m by the end of the final dwell (~30 days) and a low residual settlement rate. The pipeline’s peak actions are a bending moment 12.86 kN·m/m, shear 115.4 kN/m, and axial force 2,884 kN/m, producing a governing stress of 381 MPa, safely below the 435 MPa allowable (minimum FS ≈ 1.1). Differential settlement arises from non-uniform loading, with a maximum observed contrast of ~100 mm between loaded and lightly loaded segments. 
Co-Authors Adli Ahmad Rizaldy Asrinia Desilia Iman Handiman Nazla Nabilla Zakwan Gusnadi