Hassan, Wasswa (2025) Evaluating The Combined Use Of Woven Geotextile And Wood Piles For Peat Soil Improvement (a Case Study In Rumbai, Pekanbaru, Indonesia). Other thesis, Universitas Islam Riau.

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Abstract

Peat soils present significant geotechnical challenges because of their high compressibility, low shear strength, and excessive moisture content, making construction difficult in regions such as Rumbai, Pekanbaru, Indonesia. This study aims to evaluate the effectiveness of woven geotextile and cerucuk wood piles for peat soil reinforcement, utilising geotechnical data from the Urban Flood Control System Improvement (UFCSI) project and other geotechnical data resources such as existing published research papers mainly conducted on soft soils. Finite element modelling (FEM) was conducted using PLAXIS 2D, where woven geotextiles were modelled as geogrid elements for lateral restraint, and cerucuk wood piles were modelled as embedded beams to assess load transfer and settlement reduction. The Soft Soil Model was applied to capture the high compressibility and time-dependent consolidation behaviour of peat. A 3.0 m high embankment with a 12 m base width was simulated, incorporating meshing refinement, staged construction, groundwater effects, and consolidation analysis to ensure accurate prediction of soil behaviour. The results indicate that the unreinforced case experienced 1022 mm of settlement, while woven geotextile alone reduced settlement by 69.19% (to 315 mm), and the combination of geotextile and cerucuk wood piles further reduced settlement by 72% (to 286.7 mm). However, despite these improvements, 28% (286.16 mm) of the total settlement (1022 mm) remained, highlighting the limitations of the embedded beam modelling approach, which is more suited for medium to hard soils and may not fully capture the long-term deformation behaviour of highly compressible peat soils. Despite these limitations, the findings demonstrate that integrating woven geotextile with cerucuk wood piles is a costeffective and sustainable reinforcement technique for improving embankment stability and reducing excessive settlement in peatland conditions. To improve accuracy, future research should explore alternative modelling techniques, such as plate elements or soil elements with interface properties, increased pile density, and preloading techniques for enhanced consolidation. Additionally, a double-layered woven geotextile system and a grid arrangement of cerucuk piles may further improve reinforcement efficiency. Field validation studies should be conducted to compare numerical predictions with real-world settlement behaviour, ensuring a more reliable assessment of peat soil reinforcement.

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