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This paper presents experimental results carried out in a laboratory channel to investigate the effect of bed liquefaction on local scour development around circular bridge pier under sudden water pressure variation. Many hydraulic structures collapse due to scouring under sudden attack of flood flows or storm waves. During such a natural conditions, the water level rises abnormally above its initial level and then decreases to its original level. This phenomenon creates abrupt change of water pressure variationnear the structures and cause to failure due to scouring. Considering such a real occurrence in the hydraulic engineering field, this paper deals with the distribution of pore water pressure, effective stresses, velocity distribution and local scour around a circular bridge pier. The results show that the sediment bedis liquefied by an increase of excess pore water pressure under sudden water pressure variation and that the equilibrium local scour increases considerably than that of clear-water steady flow at the bridge pier.

EFFECT OF LIQUEFACTION ON LOCAL SCOUR AROUND A CIRCULAR BRIDGE PIER UNDER SUDDEN WATER PRESSURE DROP