摘要
文章通过MIKE21软件对金光东隧道工程所在河段进行水流泥沙运动模拟。通过对比河床27 h、15 d与45 d的高程变化曲线,发现在通常水动力条件下工程河段河床稳定,没有严重的河床下切,整体上轻微淤积,隧道区域处于轻微淤积状态,施工具有可行性和安全性;随后使用大范围水动力模型输出上游洪、中、枯水三种情况下的边界条件及三种频率设计洪峰流量组合影响下的边界条件,对隧道所在断面进行冲淤对比研究,发现在洪水期隧道断面有明显的冲刷下切现象,下切深度随洪水流量增大而增大,因此在实际施工设计时,隧道埋深要考虑极端洪水作用下的最大冲刷深度。研究结果可为该隧道工程方案设计和施工建设提供一定的参考。
In this paper,MIKE21 software was used to simulate the flow and sediment movement of the river reach of the section of Jinguang East tunnel.By comparing the elevation curves of the riverbed in 27 h,15 d and 45 d,it is found that under the normal hydrodynamic conditions,the riverbed of the project reach is stable,there is no serious undercutting of the riverbed.The whole riverbed is slightly silted,and the tunnel area is in a state of slight siltation,so the construction is feasible and safe.Then,the large-scale hydrodynamic model was used to output the boundary conditions of flood,middle and low flow in the upstream and the boundary conditions under the influence of the combination of three kinds of frequency design flood peak discharge.The comparative study of scouring and silting was carried out on the tunnel section.It is found that there is an obvious scouring undercutting phenomenon in the tunnel section during the flood period,and the undercutting depth increases with the increase of flood flow.Therefore,in the actual construction design,the tunnel buried depth should consider the maximum scouring depth under the action of extreme flood.
作者
程金标
吴德安
殷凡志
CHENG Jin-biao;WU De-an;YIN Fan-zhi(PLA 92557, Guangzhou 510720, China;College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China)
出处
《水道港口》
2021年第6期753-759,共7页
Journal of Waterway and Harbor
基金
国家自然科学基金面上项目(41776024,421776166)。
关键词
新造水道
隧道工程
MIKE21
侵蚀淤积
数值模拟
Xinzao waterway
tunnel engineering
MIKE21
erosion and deposition
numerical simulation
