摘要
本文通过310组试验,研究了上游面倾斜的溢流坝的闸墩布置。南研型和WES型的堰面在改变闸墩墩头的形状、墩头长度及闸孔净宽等因素时,量测堰面压强水头及流量系数。试验结果表明,在前述参数中以相对墩头长度(L/Hd)影响最大。综合考虑堰面压强水头和流量系数时,南研型堰面最优相对墩头长度为0.3,WES型堰面为0.4。此外,本文提出了闸墩收缩系数及流量系数的计算式,可供设计应用。
The pier arrangement on spillway crest with sloping upstream face is studied by 310 sets of experiments in the paper. Crest pressures and discharge coefficints of NHRI crest and WES crest were meassured in hydraulic models for various pier head length, form and weir spans. Experimental results indicate that the pier head length L in previously stated paramenters has the greatest influences. In consideration of crest pressure and discharge coefficient, the optimum pier head length is L=0.3H_d for NHRI crest and L=0.4H_d for WES crest. Besides, formula (2) for pier contraction coefficient ε_p and formula (5) for discharge coefficient m_p are applied in design.
