Exploring subsea dynamics: A comprehensive review of underwater pipelines and cables

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

The development of marine resources is intrinsically linked to the utilization various equipment. Among these, pipelines and cables are crucial for exploitation deep-sea oil gas resources. Mooring cables, towed umbilical submarine typical slender flexible components. These members present dynamic challenges during laying, installation, in-position operation. Facing these challenges, scholars from China around globe have explored theoretical, numerical, experimental solutions challenges. conclusions need be condensed improve their practical academic value engineering applications. This paper summarizes explorations provides general design methods concepts pipelines. Additionally, this looks forward future trend in applications as well theoretical research. aim provide a reference research underwater cables.

Language: Английский

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Impact of bedding layers to soil-pipe-liner structure under static and traffic loads with EPR technology

Tunnelling and Underground Space Technology, Journal Year: 2024, Volume and Issue: 146, P. 105651 - 105651

Published: Feb. 16, 2024

Language: Английский

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Random Forest-Based Stability Prediction Modeling of Closed Wall for Goaf

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(5), P. 2300 - 2300

Published: Feb. 21, 2025

To effectively mitigate the hazards posed by blast waves of rock mass caving on closed walls during mining process, a stability prediction method based random forest (RF) algorithm is proposed, which designed to automatically identify key parameters. A machine learning model developed using algorithm, and its performance evaluated through accuracy, precision, recall, F1-score metrics. The probabilistic objective function constructed grid search hyperparameter optimization method, allowing for selection most favorable hyperparameters evaluation. initial accuracy RF 94.6%, indicating strong predictive capability. Further adjustments base classifier, maximum depth, minimum number leaves, samples enhance model’s performance, resulting in an improved 95.9%. Finally, optimized applied predict actual project, results are consistent with on-site situation. This demonstrates that forest-based forecasts project.

Language: Английский

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Benefits of aggressively co-undergrounding electric and broadband lines outweigh costs

Cell Reports Sustainability, Journal Year: 2025, Volume and Issue: unknown, P. 100334 - 100334

Published: Feb. 1, 2025

Language: Английский

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Testing and analysis of CIPP liner under simulated groundwater pressure

Tunnelling and Underground Space Technology, Journal Year: 2024, Volume and Issue: 152, P. 105903 - 105903

Published: June 15, 2024

Language: Английский

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Experimental study on the shearing mechanical behavior of contact surface between polydimethylsiloxane modified polyaspartate polyurea and concrete

Construction and Building Materials, Journal Year: 2025, Volume and Issue: 463, P. 140157 - 140157

Published: Jan. 25, 2025

Language: Английский

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Monitoring and strengthening of prestressed concrete cylinder pipes based on distributed acoustic sensing and iron-based shape memory alloys

Underground Space, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

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Experimental study on the structural performance of RCP rehabilitation by spraying method under preloading

Tunnelling and Underground Space Technology, Journal Year: 2024, Volume and Issue: 155, P. 106218 - 106218

Published: Nov. 12, 2024

Language: Английский

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Feasibility study of FFPP thermoplastic lining for concrete pipeline rehabilitation: a case study

Urban Lifeline, Journal Year: 2024, Volume and Issue: 2(1)

Published: Dec. 2, 2024

Abstract This study investigates the feasibility and efficacy of Flexible Fiber-reinforced Polypropylene (FFPP) thermoplastic lining technology for rehabilitation concrete pipelines, specifically focusing on BONNA pipes. A custom-built test bench, featuring a 2-m high platform multiple 90° bends, was designed to simulate impact pipe gallery space, adaptability material accessibility bent pipes, cooling issues long-distance dragging materials. The simulation process utilizes modified polyvinyl chloride (PVC) liner with unique thermomechanical properties. liner, folded into an "H" shape, is mechanically inserted host using 2-ton winch pulley system. During insertion, continuous high-temperature steam injection softens material, facilitating expansion conformity pipe's internal surface. Subsequently, cold air application rigidifies below 60 °C while maintaining pressure, ensuring structural integrity adherence wall. Results revealed that FFPP successfully navigated through confined spaces, including 300 mm joint, spatial constraints led localized cracking defects during inflation. Traction tests demonstrated pulling resistance in sections bends. exhibited excellent adhesion straight but showed significant wrinkling poor Notably, remarkable strength, withstanding pressures exceeding 3.3 MPa DN300 10 cm diameter intentional defect, far surpassing on-site hydrostatic pressure 9 bar. addresses gap trenchless research by evaluating technique complex pipeline geometries, area previously understudied. While shows promise reinforcement sections, our findings reveal its geometries requires further refinement. contributes field several ways: (1) it provides empirical data performance multi-bend configurations (2) identifies specific challenges such as (3) demonstrates liner's exceptional strength under conditions. These insights advance understanding technology's potential limitations repair, paving way future development optimizing techniques systems.

Language: Английский

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Novel negative Poisson’s ratio structure for pipelines’ local trenchless rehabilitation: Experimental and simulation study

Engineering Structures, Journal Year: 2024, Volume and Issue: 326, P. 119531 - 119531

Published: Dec. 27, 2024

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