| 摘要: |
| 为评估地铁入口在短历时暴雨情景下的进水风险，基于一维二维水动力模型，采用虚拟连接边界方法，以陕西省西安市雁塔区小寨地铁入口为研究对象，在城市尺度模拟地铁入口在极端暴雨条件下的进水风险。研究结果表明：所建模型通过实测降雨验证，模拟结果与实测积水点数据的平均绝对百分比误差小于10%，可精确模拟地表-地下空间洪涝过程；在极端暴雨条件下，当降雨重现期超过200a，地铁入口就会有进水风险；地铁入口进水情况与其附近道路水深积水程度密切相关，当地铁入口距离道路垂直高度小于道路积水深度时就会发生进水现象，且小寨F口进水风险最高。综上所述，基于一维二维水动力模型的虚拟连接边界方法可精细模拟地表积水与地下空间进水的耦合过程，可为地铁防汛设计、内涝预警启动和应急封站决策提供明确的判断依据。 |
| 关键词: 数值模拟 耦合模型 地下空间 进水风险 |
| DOI： |
| 分类号: |
| 基金项目: |
|
| Numerical Simulation of Water Intrusion into Underground Spaces at Urban Scale Based on a 1D-2D Hydrodynamic Model |
|
xu1, li2, wang3, wang1, li3, ping1, hou3, zhang1
|
|
1.Powerchina Eco-environmental Group Co., Ltd.;2.Powerchina Northwest Engineering Corporation Limited;3.State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China
|
| Abstract: |
| To assess the water ingress risk at subway entrances under short-duration rainstorm scenarios, a virtual connection boundary method was employed based on one-dimensional and two-dimensional hydrodynamic models. Using the subway entrance at Xiaozhai in Yanta District, Xi''an City, Shaanxi Province, China, as the study case, the water ingress risk of subway entrances under extreme rainstorm conditions was simulated at the urban scale. The research results indicate that the established model has been validated through measured rainfall, and the average absolute percentage error between the simulation results and the measured water accumulation point data is less than 10%, which can accurately simulate the surface underground space flood process; Under extreme rainstorm conditions, when the return period of rainfall exceeds 200a, there will be water inflow risk at the entrance of the subway; The water ingress at the subway entrance is closely related to the water accumulation depth near the adjacent road. When the vertical distance between the subway entrance and the road is less than the road''s water accumulation depth, water ingress occurs. The Xiaozhai F entrance has the highest risk of water ingress. In summary, the virtual connection boundary method based on one-dimensional and two-dimensional hydrodynamic models can accurately simulate the coupled process of surface water accumulation and underground space flooding, providing clear judgment criteria for subway flood prevention design, stormwater drainage warning activation, and emergency station closure decisions. |
| Key words: numerical simulation coupling model underground space risk of water ingress |
