Author(s): Faruque Mia MD; Hiroshi Nago

Linked Author(s):

Keywords:

Abstract: Bridge damage is commonly occurring due to sudden attack of flood flows or storm waves. Failure of bridges under such a condition is closely related to the dynamic stability of the bed material as well as to the formation of local scour. The mechanisms of the dynamic behavior of bed material and local scour around bridge pier subjected to water pressure variation are presented in this paper. An experimental program was carried out using a cylindrical pier with uniform sand bed under wave action and under sudden water pressure variation. Pore water pressure at different levels of bed material and local scour around the pier were observed. Experimental results show that an excess pore water pressure develops under wave action, which reduces the effective stress of the bed material. The results also reveal that the excess pore water pressure developed under sudden water pressure drop liquefies the sediment bed and, hence, the scour depth increases considerably at a stage of liquefaction occurs.

DOI: https://doi.org/10.1080/00221680509500108

Year: 2005