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Mechanism of local scour reduction around pier using circular gabions in clear water(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年2期
Page:
96-110
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Mechanism of local scour reduction around pier using circular gabions in clear water
Author(s):
QI Hong-liang1;  WANG Jie2;  LUO Wen-jun3;  TIAN Wei-ping1;  LI Jia-chun1
(1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University,Xi'an 710064, Shaanxi, China; 2. Anhui New Vision Window Curtain Wall Engineering Co. Ltd.,Hefei 230000, Anhui, China; 3. China Municipal Engineering Southwest Design Research Institute Co. Ltd., Chengdu 610000, Sichuan, China)
Keywords:
bridge engineering;  circular gabion;  model test;  numerical simulation;  local scour
PACS:
U447
DOI:
10.19721/j.cnki.1671-8879.2025.02.009
Abstract:
To address local scour protection around bridge piers, a circular gabion anti-scour measure was proposed. Through combined physical model tests and numerical simulations, the influences of gravel particle size and gabion diameter on local scour reduction characteristics and underlying mechanisms were investigated. The computational fluid dynamics(CFD)software was employed to simulate the flow field characteristics and bed shear stress distribution around circular gabions. The results show that circular gabions effectively mitigate the local scour around piers. When the gabion protection range remains constant, the maximum scour depth initially decreases then increases with the gravel particle size, achieving an optimal scour reduction(54.9% reduction rate)at a particle size of D/24-7D/120(where D represents pier diameter). Under optimal particle size conditions, the scour depth first decreases then increases with the gabion diameter, reaching themaximum effectiveness(56.1% reduction rate)at a gabion diameter of D/5 particle size. Compared with unprotected conditions, solid collars provide 47.6% scour reduction. The distance from pier center to the maximum scour depth increases from 0.69D(unprotected)to 1.43D when using solid collars. Compared with solid collars, gabions with a particle size of D/24-7D/120 achieve 54.9% scour reduction with the maximum scour depth occurring at 1.84D from pier center. When the gabion diameter reaches D/5, the maximum scour reduction reaches 56.1% with the maximum scour depth located 1.68D from pier center. The gabion's permeability significantly reduces lateral flow velocities, while pressure differentials between internal and external flows create complex internal flow patterns, effectively reducing near-bed flow velocities and shear stresses around the pier, which plays a main role in the local scour reduction.1 tab, 22 figs, 25 refs.

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Last Update: 2025-04-01