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Experimental on local scour around cylindrical pier protected by submerged permeable pile group in clear water(PDF)

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

Issue:
2023年2期
Page:
69-79
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Experimental on local scour around cylindrical pier protected by submerged permeable pile group in clear water
Author(s):
QI Hong-liang1;  YUAN Tian-gang1;  CHEN Gui-shan1;  TIAN Wei-ping1; LI Jia-chun1;  LI Chao-ping2
(1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University,Xi’an 710064, Shaanxi, China; 2. Bureau of Xi’an Highway, Xi’an 710003, Shaanxi, China)
Keywords:
bridge engineering;  local scour;  permeable pile group;  scour protection;  clear water scour
PACS:
U447
DOI:
10.19721/j.cnki.1671-8879.2023.02.007
Abstract:
Aiming at the local scour around the cylindrical piers, a new form of local scour protection gravel-filled permeable pile group was proposed. The influence of the arrangement(60° equilateral triangle, 120° isosceles triangle and 180° lateral arrangement)and the position(distance from bridge pier)of permeable pile group on its own local scour characteristics and its scour reduction effect was studied, under the condition of a constant porosity and submerged depth of permeable piles using indoor model test. The results show that the maximum local scour depth of the permeable pile group is reduced significantly, compared with the solid piles. The reduction rate of the local scour depth of the permeable pile group decreases with the increase of the apex angle, and the maximum can be reduced by about 23.5%. When the distance between the permeable pile group and the pier is about 4D(D is the diameter of the pier), the scour reduction of the permeable pile group is the best, and the maximum reduction rate can reach 65%. With the increase of the angle of the permeable pile group, the local scour reduction rate of the permeable pile group decreases, and that of the pier increases. The protection effect of the permeable pile group is close to that of the solid pile group under the same conditions. The research results can provide reference for local scour protection of bridge piers.1 tab, 15 figs, 25 refs.

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Last Update: 2023-03-30