某工程吹填泥沙堆积数值模拟及施工方法优化

在实际近岸吹填工程中,由于无法形成有效的围堰保护导致吹填沙流失、水质污染等严重后果,进而影响施工项目的整体建设,故利用Mike21FM和Mike21ST模型对非洲某吹填工程进行数值模拟,得到该吹填工程附近海域的水面线、流速、泥沙淤积等流场数据,并基于模拟结果对施工方法进行改进。结果表明,施工期间,排沙管口附近水面高程会产生波动且管口两侧流速较大,致使排沙方向偏移,影响最终吹填效果;优化后的施工方法可有效完成吹填任务。

Numerical Simulation and Optimization Construction Method of Silting in Hydraulic Fill Project

In the actual offshore hydraulic fill project, due to not forming the effective cofferdam protection, it causes the loss of blowing sand, water pollution and other serious consequences, which affects the whole construction of the project. Therefore, numerical simulation of a certain hydraulic fill project in Africa was carried out by Mike21 FM and Mike21 ST model, and the flow fields of water surface profile, flow velocity and silting in offshore area were obtained. The construction method was improved based on the simulation. The simulation results indicate that the elevation of the water near the sand flushing nozzle will fluctuate. The velocity on both sides of the nozzle is larger, which will move the direction of the sediment delivery and affect the effect of hydraulic fill. The optimized construction method can effectively complete the hydraulic fill task.