桥墩局部冲刷计算研究

通过桥墩局部冲刷影响因素和有关参变量分析,并借鉴国内外现有公式使用经验,从能量平衡理论出发,用量纲平衡方法导出桥墩局部冲刷新公式。根据天然实测资料引入泥沙不均匀系数,并用大量室内试验和天然实测资料对新公式进行系数和指数调整。对现行规范中斜交时墩型系数及桩基承台计算公式进行改进。

Bridge Pier Local Scour Calculation

Through analyzing the factors and relevant variables that influence the depth of pier local scour, with the dimension concord theory, from the angle of energy balance and with reference to the domestic and (international) research results, the new (formula) of pier local scour is derived. In the new formula, the silt (non-even) coefficient has been introduced according to the field data. The coefficient and index of the new (formula) are also verified with plenty of in-lab tests and field data. The calculation of pier shape coefficient of (oblique) bridge sitting and the local scour calculation of pier upon pile have been improved.