円柱橋脚の静的洗掘に関する基礎実験

概要

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Clear water scour around a circular bridge pier has been studied in a wind tunnel with a sand stratum bed. The diameters of the cylinder D are 30, 40 and 50 mm, and the sand grain sizes d_s, defined as mean grain diameter of the sediment, are 0.22, 0.275, 0.46 and 0.55 mm. The effects of the pier size, the sand grain size and the flow velocity U on the terminal scour depth are investigated. The terminal scour depth Z_s is proportional to the DU^<2.4>d^<-1.05>_s. Finally, the scour depth is found to be a function of two dimensionless factors, the sediment number N_s=U/[(σ/ρ-1)gd_s]^<0. 5> and sediment Reynolds number Re_d= Ud_s/ν, as follows : Z_s/D=0.09N^<2.3>_sRe^<0.1>_d, where σ/ρ is the ratio of solid density to fluid density. The above general equation agrees with the experimental data within ±10%.
一般社団法人日本機械学会の論文
1994-10-25