Kesan Ketidakseragaman Sedimen Dasar ke Atas Kerokan Tempatan di Sekitar Tiang Bersilinder (The Effect of Non-Homogeneous Sediment Bed on Local Scour Around Cylindrical Pier)
Journal Title: Jurnal Kejuruteraan - Year 2016, Vol 28, Issue 1
Abstract
Studies of local scour around bridge commonly employed homogenous non-cohesive sediment as their simplified sediment parameters. However, sediment in real water stream is non-homogeneous with varying grain size distribution. This study investigates the local scour behaviour for two non-homogeneous, non-cohesive sediment with gradation parameter 1.5 and 2.25. Laboratory experiments were conducted using cylindrical piers with varying sizes of 2.5, 3.5, 5 and 6 cm. Measurement of maximum scour depth, transverse and longitudinal scour lengths were measured using Vernier scale after each test. The scour depth and lengths were consistently increased as the pier size increased for both types of sediment. Increment of the longitudinal and transverse scour lengths were found to be exponential when the pier size was increased from 3.5 cm to 5 cm. The effect of non-homogeneity of sediment characteristics were clearly affected the local scour behaviour where the scour depth and lengths for sediment with higher gradation parameter were much lower. Futhermore, the obtained scour characteristics were significantly underestimated when compared with values predicted with the empirical equation. This indicate that the armouring effect has taken place, where the coarser sediment protects the finer sediment from being entrained. Consequently, the level of scouring is much less than what is anticipated and posed a possibility of bridge overdesign.
Authors and Affiliations
Wan Hanna Melini Wan Mohtar, Muhammad Aminurlah Amin, Muhammad Rafi Abdul Shukor
Keywords
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- EP ID EP324007
- DOI 10.17576/jkukm-2016-28-11
- Views 107
- Downloads 0
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Kesan Ketidakseragaman Sedimen Dasar ke Atas Kerokan Tempatan di Sekitar Tiang Bersilinder (The Effect of Non-Homogeneous Sediment Bed on Local Scour Around Cylindrical Pier)
Studies of local scour around bridge commonly employed homogenous non-cohesive sediment as their simplified sediment parameters. However, sediment in real water stream is non-homogeneous with varying grain size distribut...