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为研究山区路段峡谷风对桥隧连接段上行车安全的影响,文章利用三维粘性非定常不可压缩N-S方程、k-#湍流模型,采用有限体积法建立了侧风作用下桥隧连接段周围空气流场的数值计算模型,基于风工程有关理论分析了桥隧连接段上的风特性。作者提出了桥面上空等效风速及侧风折减系数概念,更合理地反映桥面上空的风特性,并且定量地反映沿桥隧连接段行车方向风特性的变化规律,为改善峡谷风对行车安全影响提供了基础性研究。同时作者有针对性地为改善行车桥面风环境提供了匹配措施,从流场机理上定性地分析了建议措施的有效性。
In order to study the influence of canyon wind in mountainous section on the traffic safety at the connecting section of bridge and tunnel, three-dimensional viscous unsteady incompressible Navier-Stokes equations and k- # turbulence model were used to establish the air around the connecting section of bridge and tunnel Based on the theory of wind engineering, the wind characteristics of the flow field are analyzed. The author put forward the concept of equivalent wind speed over the bridge deck and the reduction coefficient of side wind, more reasonably reflect the wind characteristics over the bridge deck, and quantitatively reflect the variation of wind characteristics along the connecting direction of the bridge and tunnel. The impact of driving safety provides a basic study. At the same time, the author provides a matching measure to improve the traffic environment of bridge deck in a targeted way, and analyzes the validity of the proposed measures qualitatively from the flow field mechanism.