Experimental Study of The Combined Effect of Submerged and Stone Porcelain Plates on The Scour Depth Reduction in Cylindrical Bridgehead Group

Subject Areas : hydraulic structures

Ebrahim Nohani ¹ (Department of hydraulic Structures, Dezful Branch, Islamic Azad University, Dezful, Iran.)
mansour khajemogehi ² (M.Sc Student of Civil Engineering-Hydraulic Structures of Azad University of Dezful.)
reza farzad ³ (M.Sc Student of Civil Engineering-Hydraulic Structures of Azad University of Dezful.)

Received: 2020-09-22 Accepted : 2020-09-26 Published : 2020-09-20

Keywords: Scouring, Submerged plates, Bridge foundation, China stone,

Abstract :

Local scouring is one of the most important phenomena and factors in the destruction of the bridge bridges, which was studied in order to reduce the destructive effects of this phenomenon using the experimental model and the effect of the combined stone and chipping of the submerged plates in this study. In this research, a laboratory model of a cylindrical base group of 5 cm in diameter and a stone of china with grains of 1, 1.5 and 2.5 cm in diameter, and submerged plates in numbers (2, 4 and 6) of a plate of 10 × 15 in a flume An experimental laboratory and a landing number (0.25, 0.22 / 0.20 / 0.2) were tested and analyzed. The main objective of this study was to investigate the combined effect of Chinese stone and submerged panels on reducing the scour depth of the group The bridge is a cylindrical bridge and, using Buckingham's dimensional analysis, the parameters The results of this study showed that by increasing the diameter of the stone and the number of submerged plates, the percentage of the depth of water washed to the diameter of the base was significantly reduced. Which was found to be the highest for bases 1, 2, 3 (69%, 72%, 74%) and the lowest values (49%, 50%, 57%), which showed that by increasing the flow rate of erosion Also increased.