塔克拉玛干沙漠公路的最佳运沙路基几何结构

Yaliang Wang, Jianjun Cheng, Yuanfeng An, Ruoyuan Zhang
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摘要

为了获得沙漠道路输沙的最佳几何结构,本研究充分利用了沙漠道路的自然输沙能力,旨在减少因沙子掩埋而造成的道路损坏。研究将计算流体动力学(CFD)与优化分析理论相结合。使用 CFD 中的设计探索模块对沙漠公路路基的各种典型几何结构进行建模。采用优化分析方法对路基和路面的泥沙输运优化设计进行建模和计算。然后,利用实验设计(DOE)获得初始样点,并利用克里金模型建立响应面,从而获得输入参数和目标函数的变化趋势。最后,得到了不同流入条件下对应的泥沙输运路基横截面参数。结果表明,路堤、切削和半填充上坡路基的泥沙输运性能与路基高度呈负相关。坡度与路基泥沙输运性能之间的关系取决于路基高度和路基断面类型。对于路堤和切坡,当路基高度小于 0.5 米时,路基的泥沙输运性能与路基坡度呈正相关;但当路基高度超过 0.5 米时,泥沙输运性能与路基坡度呈负相关。对于半填充上坡流路基,路基的泥沙输运性能与路基坡度呈负相关。综合分析表明,半填挖下坡路基的输沙性能最好,路堤路基的输沙能力次之,然后是切割路基,而半填挖上坡路基的输沙性能最差。研究结论为沙漠公路因地制宜设计防沙路堤结构提供了宝贵的科学指导。这对于提高沙漠公路的泥沙输运能力、延长其使用寿命具有重要意义。
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Optimal sand transport roadbed geometry structure of Taklamakan Desert highway
In order to obtain the optimal geometric structure for sand transport in desert roads, this study fully utilizes the natural sand transport capacity of the desert roads, aiming to reduce occurrences of road damage due to sand burial. The research integrates Computational Fluid Dynamics (CFD) with optimization analysis theory. Various typical geometric structures of desert highway roadbed were modeled using the Design Exploration module in CFD. Optimization analysis methods were employed to model and compute the sediment transport optimization design on both the roadbed and road surface. Then, the initial sample points are obtained by using the Design of Experiments (DOE), and the response surface is established by using the Kriging model to obtain the change trend of the input parameters and the objective function. Finally, the cross-section parameters of the sediment transport subgrade corresponding to different inflow conditions are obtained. The results show that the sediment transport performance of embankment, cutting and semi-filled uphill subgrade is negatively correlated with the height of subgrade. The relationship between slope gradient and sediment transport performance of subgrade depends on the height of subgrade and the type of subgrade section. For embankment and cutting, when the subgrade height is less than 0.5 m, the sediment transport performance of the subgrade is positively correlated with the subgrade slope; however, when the subgrade height exceeds 0.5 m, the sediment transport performance is negatively correlated with the subgrade slope. For the semi-filled uphill flow subgrade, the sediment transport performance of the subgrade is negatively correlated with the subgrade slope. Comprehensive analysis shows that semi-filled and excavated downhill subgrade has the best sand transport performance, embankment subgrade has the second highest sand transport capacity, then cutting subgrades, while semi-filled and excavated uphill subgrade has the worst sand transport performance. The research conclusions provide valuable scientific guidance for the design of sand control embankment structures tailored to local conditions for desert highways. This is of significant importance for enhancing the sediment transport capacity of desert highways and prolonging their service life.
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