马鞍山长江公铁大桥桥墩布置水动力影响试验研究

摘要:

桥梁建设在一定范围内会造成工程局部河段水动力条件的改变,对通航条件会带来一定的影响。本文以马鞍山长江公铁大桥为例,利用建立的物理模型,研究了工程河段水流运动特性,并重点分析了桥区河段的流速、流向及汊道分流比等变化情况,模拟建桥后对工程河段水动力条件的影响。研究表明：推荐桥跨布置方案实施后,在各级流量条件下,桥区河段桥轴线上游水位有所壅高、流速略有减小,下游流速略有增加,桥位下游近岸流速有所增加,但幅度不大,对本河段内汊道分流比影响幅度均在0.3%以内,左岸侧下游的郑蒲港港区流速基本未变,建桥不会引起桥区河段水流条件发生明显改变,对通航水流条件影响较小。

Abstract:

The bridge construction will change the hydrodynamic condition of the local reach of the project in a certain range, and will bring certain influence to the navigation condition. Taking the Gongtie bridge over the Yangtze River in Ma"anshan as an example, this paper studies the characteristics of flow movement in the engineering reach by using the established physical model, effects of bridge construction on hydrodynamic conditions of engineering reach. The results show that under the condition of different discharge levels, the upstream water level of the bridge axis is upturned, the flow velocity is slightly reduced, the downstream flow velocity is slightly increased, and the nearshore flow velocity of the downstream bridge is slightly increased, but the magnitude is not large, the flow velocity of the lower reaches of the Left Bank of the Zhengpugang river is basically unchanged. The bridge construction will not change the flow condition in the bridge area, but has little influence on the navigable flow condition.