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Numerical study on mechanical properties of pipeline installed via horizontal directional drilling under static and dynamic traffic loads
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2023-03-11 , DOI: 10.1016/j.tust.2023.105077
Hongfang Lu, Xinmeng Jiang, Zhao-Dong Xu, Niannian Wang, David T. Iseley

The present study investigates the mechanical behavior of pipes installed via horizontal directional drilling method, a typical trenchless method for highway-crossing pipeline installation, under traffic loads. The effects of both stationary and moving vehicles are considered in the analysis. Results from the static analysis indicate that the pipe experiences maximum stress at its top, with minimum stress at its bottom. Furthermore, the stress change in soil is more significant than that in the pipeline as the vehicle weight increases. When a moving vehicle passes over the pipeline, the stress of the pipeline remains relatively constant. No significant change in pipe stress is observed with changes in vehicle weight and speed. However, when the vehicle speed approaches 100 km/h, the maximum soil stress decreases significantly. Conversely, the pipe stress is higher when the vehicle is stationary compared to when it is moving. A comparison is made between the mechanical behavior of pipes installed via horizontal directional drilling and open-cut methods under traffic loads, with the results revealing that the stress of pipelines installed via horizontal directional drilling method is higher than those installed via open-cut method in both static and dynamic analyses. Nonetheless, the stress variation amplitude of pipelines installed via horizontal directional drilling method is smaller during vehicular passage, thus indicating a lower possibility of fatigue failure caused by traffic loads.



中文翻译:

静动态交通载荷作用下水平定向钻进管道力学特性数值研究

本研究调查了通过水平定向钻孔方法安装的管道的力学性能,这是一种典型的非开挖公路穿越管道安装方法,在交通载荷下。分析中考虑了静止和移动车辆的影响。静态分析的结果表明,管道在其顶部承受最大应力,在其底部承受最小应力。此外,随着车辆重量的增加,土壤中的应力变化比管道中的应力变化更显着。当移动的车辆经过管道时,管道的应力保持相对恒定。随着车辆重量和速度的变化,没有观察到管道应力的显着变化。但是,当车速接近 100 km/h 时,土体最大应力明显减小。反过来,与车辆行驶时相比,车辆静止时管道应力更高。对比了水平定向钻和明挖管道在交通荷载作用下的力学性能,结果表明,水平定向钻管道的受力高于明挖管道。静态和动态分析。尽管如此,采用水平定向钻孔法安装的管道在车辆通过过程中的应力变化幅度较小,表明交通荷载引起疲劳破坏的可能性较小。对比了水平定向钻和明挖管道在交通荷载作用下的力学性能,结果表明,水平定向钻管道的受力高于明挖管道。静态和动态分析。尽管如此,采用水平定向钻孔法安装的管道在车辆通过过程中的应力变化幅度较小,表明交通荷载引起疲劳破坏的可能性较小。对比了水平定向钻和明挖管道在交通荷载作用下的力学性能,结果表明,水平定向钻管道的受力高于明挖管道。静态和动态分析。尽管如此,采用水平定向钻孔法安装的管道在车辆通过过程中的应力变化幅度较小,表明交通荷载引起疲劳破坏的可能性较小。

更新日期:2023-03-12
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