Hydromechanical analysis of slurry infiltration with coupled CFD–DEM method

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2024, Volume and Issue: 48(11), P. 3032 - 3053

Published: May 28, 2024

Abstract The tunnel face stability is closely related to the migration behavior and clogging mechanism of slurry particles in granular soils, which not yet fully understood. In this study, coupled computational fluid dynamics–discrete element method (CFD–DEM) adopted investigate infiltration at particle scale. full Johnson–Kendall–Roberts (JKR) contact model describing interparticle that accounts for cohesion present even when are microseparated after collisions clay‐clay or clay‐sand Hertz–Mindlin used sand‐sand particles. Through simulations, particle's blockage identified as physical, frictional cohesive modes, usually undergoes process aggregation‐destruction‐migration‐reassembly. Meanwhile, influences pressure, force, shape on also analyzed. results indicate high pressure lengthens path increases rate. increase enhances effective sand column by slurry, with smaller sphericity more likely clog column. These findings may enhance our understanding its practical application TBM tunneling.

Language: Английский

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Estimating Shear Strength of Marine Soft Clay Sediment: Experimental Research and Hybrid Ensemble Artificial Intelligence Modeling

Water, Journal Year: 2024, Volume and Issue: 16(12), P. 1664 - 1664

Published: June 11, 2024

In the design of offshore engineering foundations, a critical consideration involves determining peak shear strength marine soft clay sediment. To enhance accuracy estimating this value, database containing 729 direct tests on sediment was established. Employing machine learning approach, Particle Swarm Optimization algorithm (PSO) integrated with Adaptive Boosting Algorithm (ADA) and Back Propagation Artificial Neural Network (BPANN). This novel methodology represents initial effort to employ such model for predicting soil. validate proposed four conventional algorithms were also developed as references, including PSO-optimized BPANN, Support Vector Machine (SVM), ADA-BPANN. The study results show that PSO-BPANN model, which has undergone optimization via (PSO), prediction efficiency in performance sediments surpass offered by traditional models. Additionally, sensitivity analysis conducted innovative highlights notable impact factors normal stress, soil density, number drying–wetting cycles, average particle size type sediment, while moisture content temperature is comparatively minor. Finally, an analytical formula derived from allows precise estimation catering individuals lacking background learning.

Language: Английский

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Experimental Study on the Temperature-Dependent Static, Dynamic, and Post-Dynamic Mechanical Characteristics of Municipal Solid Waste

Materials, Journal Year: 2024, Volume and Issue: 17(16), P. 4012 - 4012

Published: Aug. 12, 2024

Municipal solid waste (MSW) has huge potential to be recycled as construction material, which would have significant benefits for environmental conservation. However, the cornerstone of this undertaking is a comprehension mechanical response MSW in real-world engineering locations, taking into account effects stress levels and temperature. In paper, well-mixed samples were sieved crushed produce standardized specimens cylindrical molds. A series static, dynamic, post-cyclic shear tests conducted on at temperatures ranging from 5 °C 80 with normal stresses 50 kPa, 100 150 kPa. The experimental findings demonstrate that presents temperature range-dependency; variation between 20 affects MSW’s reaction more than 40 under various settings; °C~80 °C, static peak strength highest, being followed by strength, while dynamic lowest; sensitivity largest, lowest.

Language: Английский

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Reinforcement mechanism of interior restraint plate on soil plug formation during pile installation

Ocean Engineering, Journal Year: 2024, Volume and Issue: 316, P. 120004 - 120004

Published: Dec. 6, 2024

Language: Английский

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Impact of Excavation on Adjacent Elevated Bridges and Optimization Analysis of Deformation Control

Buildings, Journal Year: 2024, Volume and Issue: 14(10), P. 3197 - 3197

Published: Oct. 8, 2024

Based on the deep foundation pit project of TOD (Transit-Oriented Development) complex Shaoxing North High-speed Railway Station, influence different construction stages deformation and inclination rate adjacent elevated bridge its variation law are studied through field measurement numerical simulation. The process is optimized by method reinforcement outside adjustment preloaded axial force, distance bridges summarized. results show that with excavation pit, pier pile gradually increases, piers larger than foundations. As depth soil force maximum vertical displacement foundations decreases. deeper reinforcement, better control effect bridge. In actual construction, it recommended be taken as pit. It obvious subject to angle effect, appropriate value should selected according site conditions. generally shows a decreasing trend increase in between When close will affected fluctuation decrease. conclusions drawn article can serve basis reference for design provide similar projects.

Language: Английский

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