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本文根据水力学和河流动力学的基本原理,通过对桥渡水文观测、桥梁水毁调查和桥墩冲刷模型试验等资料的分析,依据桥墩局部冲刷的现象和成因,以及散粒体泥沙、粘性土及岩石河床不同的特性,抓住互为影响的几个主要因素,采用相关分析法,建立了散粒体泥沙、粘性土和岩石河床桥墩局部冲刷计算的通用公式。基本式为: h_B=K_ηK_ξb_1~0h_p~(60.15)V_s~n其中:1.散粒体泥沙河床 K_(η1)=(0.25/d_(cp)~(0.7)+0.0004d_(cp)~(1.8))~(1/2) n_1=0.46(V_0~’/V_0)~(-0.5) 2.粘性土河床 K_(η2)=0.57I_L~(0.9) n~2=1.0 3.岩石河 K_(η3)=0.12(σ·f)~(-0.37) n~3=1.0通用公式经过实桥观测和调查资料检验,结果尚为满意。
Based on the basic principles of hydraulics and river dynamics, through the analysis of the data of bridge crossing hydrological observation, bridge damage investigation and bridge pier scouring model test and so on, according to the phenomena and causes of partial scouring of pier and the sediment, Soil and rock riverbed. Taking the influence of several main factors, a general formula for calculating the local scour of sediment, clayey soil and rock river bed piers is established by using correlation analysis method. The basic formula is: h_B = K_ηK_ξb_1 ~ 0h_p ~ (60.15) V_s ~ n Among them: 1. Sediment bed sediment K_ (η1) = (0.25 / d cp ~ 0.7) + 0.0004d cp ~ 1.8) ~ (1/2) n_1 = 0.46 (V_0 ~ ’/ V_0) ~ (-0.5) 2. Cohesive soil bed K_ (η2) = 0.57I_L ~ (0.9) n ~ 2 = 1.0 3. Rock River K_ (η3) = 0.12 (σ · f) ~ (-0.37) n ~ 3 = 1.0 The general formula is verified by the real bridge observation and survey data. The results are still satisfactory.