Abstract
Because of the problem of local scour caused by the change of the flow structure caused by the water-resistance of the column bridge pier, the theoretical analysis, and indoor water tank test were used to study the effect of installing a new anti-scouring device in front of the bridge pier on the local scour reduction effect; the influence of the main design parameters such as the height of the protective device, the angle of the protective device and the distance from the protective device to the bridge pier on the local scour of the bridge pier was selected, and the optimal parameter design combination was selected. The test results show that: under the same water flow conditions, the maximum scour depth reduction rate of the measuring point under the protection of the protective device is 48.4% to 74.2% compared with the unprotected scour; the reduction rate of the bridge pier is relative to the relative height of the device and the device equivalent. The angle and the distance between the device and the bridge pier are related, and the shock reduction rate decreases with the increase of the flow intensity. In the test range, the ratio of the device height to the water depth is 2/3, the device angle is 60 °, and the distance from the bridge pier is 3. When the diameter of the pier is doubled, the effect of reducing the impact on the pier is the best.
Highlights
Local scour of bridge pier refers to the scour caused by strong eddy current around the pier due to the obstruction of the pier
Pier scour depth is usually calculated according to the superposition of general scour and local scour, common local scour protection measures are mainly protecting local scour around the pier, which is called local scour protection[6]
The scour depth develops relatively rapidly, and at the same time, a siltation area is formed on the back water side of the pier under the action of eddy current transportation
Summary
Local scour of bridge pier refers to the scour caused by strong eddy current around the pier due to the obstruction of the pier. The exploration of the scour development process, the water flow structure around the pier abutment, and the calculation of the maximum scouring depth around the pier abutment[1,2] has important guiding significance for engineering design, safe operation of bridges, and research on local scour protection measures[3,4,5]. Since partial erosion protection measures for bridge piers are a more effective way to deal with erosion problems, domestic and foreign scholars, such as Yang Shaopeng et al.[7], Liang Fayun et al.[8], Lagasse et al.[9], Barkdoll et al.[10], have conducted theoretical research on pier foundation scour, while doing a lot of research on protection measures for local scour. The influence of the height, angle and the distance from the pier on the scour is further analyzed, and the optimal design combination of the protective device is studied
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