新建桥墩对整治建筑物影响及守护措施研究

拟建南纪门轨道专用桥桥墩距离下游整治建筑物最小距离仅24 m,桥墩建成后将对整治建筑物自身稳定产生一定的不利影响，进而可能影响该河段航道整治效果和既定整治目标的实现。采用二维水流泥沙数学模型，计算桥墩建成后水沙条件变化，并对提出的联合守护方案效果进行分析。结果表明：桥梁建设对工程河段航道的通航水流条件影响较小，但会造成桥墩、直立式挡墙前沿和丁顺坝坝头等区域产生局部冲刷，影响桥墩、挡墙及Z^#₁丁顺坝自身的稳定性；联合守护方案实施后，局部冲刷范围明显减小，冲刷强度显著减弱，保障了整治建筑物和桥梁的稳定性，确保航道整治工程原设计功能的正常发挥。

Influence of new bridge piers on regulation buildings and its protection measures

The minimum distance between the piers of the proposed Nanjimen track-specific bridge and the downstream regulation buildings is only 24 m. The completed piers will have a certain adverse impact on the stability of the regulation buildings themselves, which can affect the waterway regulation effect of this river section and the realization of the established regulation goals. We use the two-dimensional flow and sediment mathematical model to calculate the changes of water and sediment conditions after the completion of the bridge piers, and analyze the effect of the proposed joint protection scheme. The results show that the bridge construction has little impact on the navigable flow conditions of the channel in engineering river section. However, it will cause local scour in areas such as the pier, the front of the vertical retaining wall and the head of the spur longitudinal dike, which can affect the stability of the pier, the retaining wall and the Z1# spur longitudinal dike itself. After the implementation of the joint protection scheme, the local scour range is significantly reduced, and the scour intensity is significantly weakened, which ensures the stability of the regulation buildings and bridges, and ensures the normal functioning of the original design function of the channel regulation project.