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Journal Article

Computational Method for Maximum Sediment Discharge and Sand-Carrying Wind Load in the Prevention and Treatment of Wind Drift Sand for Railway in Strong Wind Area

TL;DR: In this paper, a hazard control engineering for wind-sand flow in strong wind area along railway, research was carried out on two most critical calculation problems: the maximum sediment discharge and sand-carrying wind load.
Abstract: According to the hazard control engineering for wind-sand flow in strong wind area along railway,research was carried out on two most critical calculation problems: the maximum sediment discharge and sand-carrying wind load.Combined with field survey information and test data,the control influence of wind direction,wind power and duration on the vector composition and calculation of the maximum sediment discharge was analyzed.Based on theory of preferred strong wind flow,calculation method was induced for the maximum sediment discharge under three typical wind types,namely,trade wind type,monsoon type and convection type.In order to accurately collect sand sample data,an automatic outdoor sand-taped instrument which could be automatically rotated with the main wind direction was specially designed.Based on field test data,and according to similarity criteria as well as dimension concordant principle,formula was deduced for calculating the average velocity of gravel particle fluid of sand-carrying wind per unit volume in strong wind area,which was used to calculate the impact load of sand-carrying wind in strong wind area.The calculated results agree with engineering practice and thus engineering calculation requirements can be met.
Citations
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Journal ArticleDOI
TL;DR: In this article, a piezoelectric ceramic chip called PZT-5A was used as a force sensor to measure sand impact force in wind-driven sand flow field.

3 citations

Journal ArticleDOI
TL;DR: In this article , a transmission tower was modeled and simulated in SAP2000 to explore the dynamic response of the tower towards wind-sand loads, and the results showed that the structural dynamic responses of transmission towers due to the wind sand effect are pronounced.
Abstract: Sandstorms are a common natural phenomenon that has the potential to cause severe disruptions to civil infrastructure. However, the effect of sandstorms on transmission tower structures has not received much attention. This paper proposes the simulation of the wind-sand loads for the analysis of transmission tower structures under sandstorm excitation by superposing the wind loads and sand particle loads. The wind load is generated based on Kaimal fluctuating wind power spectrum and the harmonic superposition method, and the sand load is constructed based on the law of conservation of momentum and sandstorm classification. A transmission tower was modeled and simulated in SAP2000 to explore the dynamic response of the tower towards wind-sand loads. A comparison of wind-induced and wind-sand-induced responses shows that the structural dynamic responses of transmission towers due to the wind-sand effect are pronounced. Particularly, the maximum longitudinal displacements and axial forces increased greatly. The results showed that the sandstorm loads for transmission towers cannot be neglected, and more attention should be paid to the structural design of transmission towers to resist such loads.

2 citations

Journal Article
TL;DR: In this paper, a system of design, construction and operation of natural and technical objects set of organizational and technical measures, consisting of techniques: the choice of method, to map the distribution of exogenous events, the development of a program of measures for the protection and the optimization of the work program, assess the quality and effectiveness.
Abstract: Summary. The paper focuses on the reduction of negative effects on the railway exogenous processes (sand bars, landslides, etc.). Proposed to introduce a system of design, construction and operation of natural and technical objects set of organizational and technical measures, consisting of techniques: the choice of method, to map the distribution of exogenous events, the development of a program of measures for the protection and the optimization of the work program, assess the quality and effectiveness. Methodological elements are developed by the author of the complex method of risk assessment exogenous expression and scale of priorities of road elements of the defense.

2 citations


Cites background from "Computational Method for Maximum Se..."

  • ...the normal functioning of the NTS [12-15]....

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  • ...Sandy flow encountering obstacles in its path under certain conditions, seek to destroy them, which leads to blowing of roadbed of railways and roads [12]....

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