Performance Analysis of Hybrid Steel–Concrete and Timber–Concrete Composite Pile Systems in Variable Density Sandy Soils Using Experimental and Numerical Insights DOI Creative Commons
Ibrahim Haruna Umar, Müge Elif ORAKOĞLU FIRAT, Hang Lin

и другие.

Applied Sciences, Год журнала: 2025, Номер 15(11), С. 5868 - 5868

Опубликована: Май 23, 2025

Hybrid composite pile foundations face critical challenges in terms of optimizing load transfer mechanisms across variable soil densities, particularly regions like Kano, Nigeria, characterized by loose to dense sandy deposits and fluctuating groundwater levels. This study addresses the need for sustainable, high-performance foundation systems that are adaptable diverse geotechnical conditions. The research evaluates mechanical behavior steel–concrete timber–concrete hybrid piles, quantifying skin friction dynamics, combining eight (8) classical ultimate bearing capacity (UBC) methods (Vesic, Hansen, Coyle Castello, etc.) with numerical simulations, assessing distribution sand relative densities (10%, 35%, 50%, 75%, 95%). Laboratory investigations included characterization Wudil River well-graded (SW), direct shear tests, interface tests on materials. Relative were calibrated using electro-pneumatic compaction. Increasing Dr from 10% 95% reduced void ratios (0.886–0.476) permeability (0.01–0.0001 cm/s) while elevating dry unit weight (14.1–18.0 kN/m3). Skin angles rose 12.8° (steel–concrete) 37.4° (timber–concrete) at = 95%, timber interfaces outperforming steel 7.4° 10%. UBC piles spanned 353.1 kN 10%) 14,379 95%), achieved 9537.5 (Hansen, PLAXIS simulations aligned closely Vesic’s predictions (14,202 vs. kN). underscores significance density, material interfaces, method selection design.

Язык: Английский

Performance characterisation of machine learning models for geotechnical axial pile load capacity estimation: an enhanced GPR-based approach DOI
Ibrahim Haruna Umar,

Mahir Sukairaj Salga,

Hang Lin

и другие.

Geomechanics and Geoengineering, Год журнала: 2025, Номер unknown, С. 1 - 42

Опубликована: Фев. 24, 2025

Язык: Английский

Процитировано

2
Seasonal Dynamics in Soil Properties Along a Roadway Corridor: A Network Analysis Approach DOI Open Access
Ibrahim Haruna Umar,

Ahmad Muhammad,

Hang Lin

и другие.

Materials, Год журнала: 2025, Номер 18(8), С. 1708 - 1708

Опубликована: Апрель 9, 2025

Understanding soil properties' spatial and temporal variability is essential for optimizing road construction maintenance practices. This study investigates the seasonal of properties along a 4.8 km roadway in Maiduguri, Nigeria. Using novel integration network analysis geotechnical testing, we analyzed nine parameters (e.g., particle size distribution (PSD), Atterberg limits, California bearing ratio) across wet (September 2024) dry (January 2021) seasons from 25 test stations. Average limits (LL: 22.8% vs. 17.5% dry; PL: 18.7% 14.7% PI: 4.2% 2.8% LS: 1.8% 2.3% dry), average compaction characteristics (MDD: 1.8 Mg/m3 2.1 OMC: 12.3% 10% CBR (18.9% 27.5% dry) were obtained. Network employed z-score standardization similarity metrics, with multi-threshold (θ = 0.05, 0.10, 0.15) revealing critical structural differences. During season, networks exhibited 5.0% reduction edges (321 to 305) density decline (1.07 1.02) as thresholds tightened, contrasting dry-season retaining 99.38% connectivity (324 322 edges) stable (0.99). Seasonal shifts classification (A-4(1)/ML A-2(1)/SM underscored moisture-driven plasticity changes. The findings highlight implications adaptive design, emphasizing moisture-resistant materials optimized periods.

Язык: Английский

Процитировано

2
Stabilization of Expansive Soils Using Cement–Zeolite Mixtures: Experimental Study and Lasso Modeling DOI Open Access
Ibrahim Haruna Umar, S. A. R. Abu–Bakar, Aminu K. Bello

и другие.

Materials, Год журнала: 2025, Номер 18(10), С. 2286 - 2286

Опубликована: Май 14, 2025

The stabilization of expansive soils is crucial for the construction projects to mitigate swelling, shrinkage, and bearing capacity issues. This study investigates synergistic effects cement clinoptilolite zeolite on stabilizing high-plasticity clay (CH) soil from Kano State, Nigeria. A total 30 admixture combinations-cement (0-8%) (0-15%)-were tested via standardized laboratory methods evaluate their free swell index (FSI), percentage, pressure, California Bearing Ratio (CBR). Principal component (Lasso) "least absolute shrinkage selection operator" regression modeled interactions between admixtures properties. key results include following: (1) 6% + 12% reduced FSI by 60% (45 → 18); (2) 8% 15% decreased percentage 47.8% (22.5% 11.75%); (3) lowered pressure 54.2% (240 kPa 110 kPa); (4) 50% (5.6% 2.8%); (5) 9% achieved an unsoaked CBR 80.01% soaked 72.79% (resilience ratio: 0.8010). PCLR models explained 93.5% (unsoaked) 75.0% (soaked) variance, highlighting how zeolite's mediation analysis indicates that improves mainly reducing (path coefficient = -0.91429, p < 0.0001), while conditional process modeling provided greater explanatory power (R2 0.745) compared moderation-only 0.618). demonstrates zeolite-cement blends optimize strength resilience in soils, with implications sustainable infrastructure arid semi-arid regions.

Язык: Английский

Процитировано

0
Performance Analysis of Hybrid Steel–Concrete and Timber–Concrete Composite Pile Systems in Variable Density Sandy Soils Using Experimental and Numerical Insights DOI Creative Commons
Ibrahim Haruna Umar, Müge Elif ORAKOĞLU FIRAT, Hang Lin

и другие.

Applied Sciences, Год журнала: 2025, Номер 15(11), С. 5868 - 5868

Опубликована: Май 23, 2025

Hybrid composite pile foundations face critical challenges in terms of optimizing load transfer mechanisms across variable soil densities, particularly regions like Kano, Nigeria, characterized by loose to dense sandy deposits and fluctuating groundwater levels. This study addresses the need for sustainable, high-performance foundation systems that are adaptable diverse geotechnical conditions. The research evaluates mechanical behavior steel–concrete timber–concrete hybrid piles, quantifying skin friction dynamics, combining eight (8) classical ultimate bearing capacity (UBC) methods (Vesic, Hansen, Coyle Castello, etc.) with numerical simulations, assessing distribution sand relative densities (10%, 35%, 50%, 75%, 95%). Laboratory investigations included characterization Wudil River well-graded (SW), direct shear tests, interface tests on materials. Relative were calibrated using electro-pneumatic compaction. Increasing Dr from 10% 95% reduced void ratios (0.886–0.476) permeability (0.01–0.0001 cm/s) while elevating dry unit weight (14.1–18.0 kN/m3). Skin angles rose 12.8° (steel–concrete) 37.4° (timber–concrete) at = 95%, timber interfaces outperforming steel 7.4° 10%. UBC piles spanned 353.1 kN 10%) 14,379 95%), achieved 9537.5 (Hansen, PLAXIS simulations aligned closely Vesic’s predictions (14,202 vs. kN). underscores significance density, material interfaces, method selection design.

Язык: Английский

Процитировано

0