Comparison of Calculation Methods for Local Scour in Bridge Pier Foundation of Piles-Cushion Cap

Authors

LIU Hui, Hubei Communications Planning and Design Institute Co ., Ltd., Wuhan, Hubei 430051, ChinaFollow
JIANG Yanhua, Jiangsu Provincial Water Conservancy Project Planning Office, Nanjing, Jiangsu 210029, China
YAN Jiechao, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210029, China; Jiangsu Survey Design and Research Institute Co ., Ltd., Power Construction Corporation of China, Nanjing, Jiangsu 211000, ChinaFollow

Corresponding Author

闫杰超, 男, 博士研究生, 工程师. E-mail: 799971729@qq.com

Abstract

In order to analyze the calculation methods for local scour in bridge pier foundation of piles-cushion cap,this paper listed the six common Chinese and foreign calculation methods,described their calculation process and selection of calculation parameters,and analyzed the difference of the calculation methods according to typical engineering examples.The results show that there are differences in the selection of parameters in the calculation methods for local scour in bridge pier foundation of piles-cushion cap in Code for Survey and Design on Hydrology of Railway Engineering (TB 10017—2021 ) and Hydrological Specifications for Survey and Design of Highway Engineering (JTG C 30—2015 ),and the calculation results of the railway code are more conservative than those of the highway specification.Through the analysis of two typical engineering examples,it is found that under the tranquil flow condition,the local scour depth calculated by the foreign methods is relatively conservative compared with that calculated by the Chinese methods.The calculated value of the local scour depth calculated by the foreign methods is basically in a reasonable range,while that calculated by the Chinese methods,especially the current calculation methods from the specifications,shows certain deviation.At the same time,by comparing the results of different Chinese and foreign calculation methods for local scour in bridge pier foundation of piles-cushion cap,it can be seen that as the distance between the top elevation of pile cap and the current mud surface is smaller,the local scour depth is larger,indicating that the influence of pile cap on scour is more and more significant in the whole local scour process of bridge pier foundation of piles-cushion cap.Meanwhile,according to the numerical simulation of case 2,the influence characteristics of pile cap height on local scour are confirmed.Therefore,the research results reveal the local scour mechanism of bridge pier foundation of piles-cushion cap to a certain extent and provide a theoretical reference for the selection and application of subsequent calculation methods for local scour in bridge pier foundation of piles-cushion cap.

Publication Date

12-24-2025

DOI

10.14048/j.issn.1671-2579.2025.06.016

First Page

137

Last Page

145

Submission Date

December 2025

Recommended Citation

Hui, LIU; Yanhua, JIANG; and Jiechao, YAN (2025) "Comparison of Calculation Methods for Local Scour in Bridge Pier Foundation of Piles-Cushion Cap," Journal of China & Foreign Highway: Vol. 45: Iss. 6, Article 16.
DOI: 10.14048/j.issn.1671-2579.2025.06.016
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss6/16

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