Author(s): Sun Yi; Pan Miao; Xiaoyan Yi; Jing Ma
Linked Author(s):
Keywords: Bridge group piers; Local scouring; Flume experiment; Scouring depth
Abstract: Local erosion of bridge piers has always been a practical problem encountered in engineering. Especially with the rapid development of urban scale, bridge resources are becoming increasingly scarce, constrained by various factors such as transportation, ecology, and regional planning, leading to an increasing number of bridge group construction situations. How to quantitatively handle the mutual influence between local scouring of upstream and downstream bridge piers has become an urgent practical problem that needs to be solved, which is of great significance to the safety of bridges. Based on the generalized flume experiment of local scouring in bridge groups, the comprehensive results of local scouring for single pier and parallel bridge piers (bridge groups) were obtained. The results show that under the conditions of single pier tests, there is a positive correlation between the local scouring depth of pier and the approaching velocity v and pier width B. The value range of the approaching velocity index a is 0.71~0.74, and the value range of the pier width index b is 0.68~0.71. Under the condition of parallel bridge piers, the flow velocity in front of the downstream pier (side pier) located directly behind the upstream pier is lower than that of the upstream pier, and the flow velocity in front of the downstream pier (middle pier) between the upstream piers increases. The scouring depth of upstream pier and downstream side pier is smaller than that of single pier, while the scouring depth of downstream middle pier is greater than that of single pier and upstream pier. As the distance between upstream and downstream bridges increases, the scouring depth of downstream side pier gradually increases and approaches that of single pier. The scouring depth of the upstream pier and downstream side pier is about 0.9 and 0.6 times that of single pier, and the scouring depth of the downstream pier is about 0.6 times that of the upstream pier. The depth of the middle pier of the downstream bridge increases, and the increase in depth under experimental conditions is about 7%.
Year: 2024