|Table of Contents|

Mechanism of permeable sacrificial pile to reduce local scour depth of longitudinal double piers(PDF)

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

Issue:
2024年2期
Page:
68-79
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Mechanism of permeable sacrificial pile to reduce local scour depth of longitudinal double piers
Author(s):
QI Hong-liang;  LUO Wen-jun;  WANG Jie;  TIAN Wei-ping;  LI Jia-chun
(Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University,Xi'an 710064, Shaanxi, China)
Keywords:
bridge engineering;  longitudinal double pier;  model test;  numerical simulation;  permeable sacrificial pile;  clear water scouring
PACS:
U447
DOI:
10.19721/j.cnki.1671-8879.2024.02.007
Abstract:
In view of the common problem that local scour protection of longitudinal double bridge piers in engineering practice, the influence of two factors, namely the particle size of gravel filled with permeable sacrificial piles and submergence rate, on the local scour characteristics of permeable sacrificial piles and longitudinal double bridge piers were studied, under the condition of clear water using the combination of indoor model test and numerical simulation. The results show that the local scour depth of longitudinal double piers decreases first and then increases with the increase of pier center distance without sacrificial pile protection. When the pier center distance is 4D(D is the pier diameter), the front pier's protection effect against the rear pier's local scour is the best. Under the same conditions(the best pier center distance), when the solid sacrificial piles and permeable sacrificial piles are used to protect the longitudinal double piers respectively, both the local scour of the upstream piers can be reduced effectively, and the permeable sacrificial piles are better for protection, and the local scour depth of the self can be reduced by about 30% compared with the solid sacrificial piles. When permeable sacrificial piles are used for protection, the best effect is achieved, when the particle size of the rock fill is 0.2D to 0.25D and the submergence rate is 1.0. The permeability of the permeable sacrificial pile allows part of the water to flow through the pile body, the strength of the submerged flow is reduced effectively in front of the pile, its bottom digging effect is reduced, and the local scour depth is reduced effectively. Compared with solid sacrificial pile protection, the maximum shear stress on both sides of the permeable sacrificial pile and upstream pier is about 1/2 and 1/4 of the former respectively. The range of low shear stress zone behind permeable sacrificial pile is larger.1 tab, 16 figs, 26 refs.

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Last Update: 2024-03-01