Experimental study of influence of ridged collar on local scour of bridge piers under ice sheet

(1.College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;2.Hohhot Togtoh County Rural Revitalization Coordinated Development Center, Togtoh 010200, China)

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    Based on the principle of local scour of bridge piers, and on the basis of the anti-scour measures of horizontal collars, a new anti-scour protection measure, called ridged collar, which can change the water flow around the piers was designed. In order to explore the protective effect of the ridged collar on the local scour of cylindrical bridge piers, indoor physical model tests were conducted using ridged collars of different shapes, and the scour characteristics and hydraulic properties around the pier were studied. The test results show that, the protection effect is the best for a ridged collar installed on the bed surface with a height of 1 cm and an angle of 135°. Compared with cases of no protective measures, after the ridged collar is installed on the bridge pier, the maximum scour depth reduction can reach 62.2%, and the vertical flow velocity and vertical turbulence intensity at the bottom of the pier can be significantly reduced. Through multivariate analysis, an empirical equation for calculating the non-dimensional maximum scour depth around the pier is established, which is applicable to both open channel flows and flows under ice sheet.

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牟献友,陈秉如,高鹏程,等.钩环式护圈对冰盖下桥墩局部冲刷影响的试验研究[J].水利水电科技进展,2023,43(2):1-8, 26.(MOU Xianyou, CHEN Bingru, GAO Pengcheng, et al. Experimental study of influence of ridged collar on local scour of bridge piers under ice sheet[J]. Advances in Science and Technology of Water Resources,2023,43(2):1-8, 26.(in Chinese))

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  • Received:May 22,2022
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  • Online: March 10,2023
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