Mathematical modeling of aerodynamic processes in railway tunnels on high-speed railways

Ledyaev, Alexander; Kavkazskiy, Vladimir; Vatulin, Yan; Svitin, Valeriy; Shelgunov, Oleg

doi:10.1051/e3sconf/202015706017

Cited by 13 publications

(3 citation statements)

References 9 publications

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“…Numerical modeling for determining deformations and displacements of structures in the ground environment is performed using geotechnical software systems PLAXIS 2D, 3D, PLAXIS-tunnels. The stress-strain state (SSS) and the maximum permissible stresses that do not cause a violation of the structural safety of the structure are calculated using the design programs ROBOT-str, MIDAS IT [11,12,13]. The structural safety of underground wastewater disposal facilities is influenced by the impact of external, static and dynamic influences.…”

Section: Restoration Of Underground Water-carrying Communications In ...mentioning

confidence: 99%

Restoration of underground water-carrying structures damaged by external non-stationary impacts

Perminov

2023

E3S Web Conf.

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Object and purpose of the study: Underground aquiferous point and linear structures operated in difficult ground conditions lose their structural safety as a result of the influence of external forces and the environment. It is important to establish the features of the operation of underground aquifers and communications in an inhomogeneous enclosing soil massif, taking into account the interaction of structures with the ground in case of non-stationary force impacts and environmental impacts with an assessment of their structural safety. Methods: The use of analytical and experimental research methods to evaluate the work of structures in the soil mass, taking into account force influences and environmental influences. Results: The features of interaction of the housing of a collapsible pipe with a soil mass with a multidirectional horizontal component of a non-stationary load are established. The negative impact of the combination of the multidirectional impact of the power load and internal hydrostatic pressure on the structural safety of the housing of a prefabricated underground structure is shown. Practical significance and conclusions: The results obtained on the picture of the stress-strain state of an inhomogeneous enclosing soil massif allowed us to establish the nature and boundaries of the safe operation of structures and to make suggestions on the choice of ways to strengthen and protect underground structures, taking into account their operating conditions.

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Section: Restoration Of Underground Water-carrying Communications In ...mentioning

confidence: 99%

Restoration of underground water-carrying structures damaged by external non-stationary impacts

Perminov

2023

E3S Web Conf.

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“…The magnitude of the pressure drop in the tunnel is affected by the train length that leads to the "pressure-length ratio" dependency in terms of the maximum pressure loss determination [31]. The length ratio λ is defined as:…”

Section: Prediction Of Aerodynamic Parameters For the "Train Inside The Tunnel" Casementioning

confidence: 99%

Research@ZaB: Study of FDS Capabilities to Assess the High-Speed Train Impact on Pressure Pattern Within a Railway Tunnel

Patsekha

Galler

2021

Berg Huettenmaenn Monatsh

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The “wind tunnel” approach is applied to study high-speed train aerodynamics in a railway tunnel using FDS software. The main focus of the research is on the pressure distribution along the tunnel. Proven analytical dependencies based on the experimental observations for air jet centerline velocity and flow entrainment are used to evaluate the model setup. A model verification is carried out based on the pressure drop calculations due to viscous effects where the impact of the surface roughness and the tunnel length are also considered. A sensitivity analysis is performed to evaluate changes in input FDS parameters and to explore interactions between them. It is proposed to use the standard deviation, obtained from the calculated time-averaged pressure values, to specify the appropriate numeric parameter combinations, e.g. DT and PRESSURE_TOLERANCE, considering the desired results consistency and the computational time consumed. The simulated cases with and without a train inside a tunnel provide data on the aerodynamic characteristics of the models. The obtained volumetric and cross-sectional profiles for pressure and airflow velocity distribution form the basis for an informed decision regarding the tunnel design or safety solutions, for example, defining areas under maximal and minimal pressure loads. The analysis displays the necessity to carefully manage each investigated case considering the FDS features and limitations that largely affect a model setup and calculations.

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“…Aerodynamic shocks of air waves generated by trains rushing by at high speed affect the safety and acoustic comfort of passengers and urban residents. The main risks of the HSL for man-made structures are the transition section before the tunnel and the impact of lateral wind when driving on the embankment or bridge [1,2].…”

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confidence: 99%

Green principles of ecological safety of transport construction

Shestakova

Shestakov

2023

E3S Web Conf.

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The current trend toward the use of 3D concrete printing represents a vector for green financing of innovative transportation projects and a shift from traditional construction to additive manufacturing and a closed-loop economy. The potential impact of additive technology in the field of transport infrastructure is expected to be greater than in any other, due to the scale of construction printing and its environmental potential to ensure the environmental safety of transport construction at the global, regional and local levels, which appears to be a relevant interdisciplinary research area. The article analyzes the transition to a "green economy," including the introduction of additive technologies and the rational use of construction resources. The article gives proposals for energy-efficient and ecological green construction of high-speed railways and provides a rationale for the use of additive technologies using 3D-printed noise protection walls made of eco-concrete (green concrete, geo-concrete). The main recommendations on the choice of structures, optimal for the implementation of active noise protection measures on high-speed railways and artificial constructions are given. Presented the work of PSTU students of the Faculty of Transport Construction on the subject of 3D printing of noise protection panels with different acoustic performance. Modern architectural solutions were made with the preparation of a feasibility study on the implementation of innovations and the development of green design competencies.

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Mathematical modeling of aerodynamic processes in railway tunnels on high-speed railways

Cited by 13 publications

References 9 publications

Restoration of underground water-carrying structures damaged by external non-stationary impacts

Restoration of underground water-carrying structures damaged by external non-stationary impacts

Research@ZaB: Study of FDS Capabilities to Assess the High-Speed Train Impact on Pressure Pattern Within a Railway Tunnel

Green principles of ecological safety of transport construction

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