| 王京,孙双科,汪星,孟席,柳海涛,乔明秋.某重力坝工程泄洪排沙底孔的运行方式研究[J].中国水利水电科学研究院学报,2020,18(6):455-461 |
| 某重力坝工程泄洪排沙底孔的运行方式研究 |
| Study on the operation mode of the bottom orifices for the discharge of flood and sediments in a gravity dam project |
| 投稿时间：2020-07-22 |
| DOI：10.13244/j.cnki.jiwhr.20200142 |
| 中文关键词: 泄洪排沙底孔 底流消力池 水力设计 运行方式 下游冲刷 |
| 英文关键词:bottom outlet for flood discharge and sediment discharge stilling basin hydraulic design oper-ation mode downstream scouring |
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| 摘要点击次数: 819 |
| 全文下载次数: 1860 |
| 中文摘要: |
| 某重力坝工程最大坝高67 m，其泄水建筑物由4个溢流表孔与2个泄洪排沙底孔组成，采用底流消能方式，因水库泥沙问题较为突出，设计方面制订了优先开启底孔进行泄洪排沙的运行方式。整体水工模型试验发现，当宣泄中小洪水底孔全开运行时，由于入池Fr数小，且下游水位低，导致底孔消力池消能效果欠佳，护坦下游河床冲刷严重，为此对泄水建筑物的运行方式进行了调整，采用底孔闸门半开运行并启用表孔参与泄洪的运行方式。水工模型试验结果表明，泄洪底孔采用半开方式能显著提高消力池消能效果并减轻下游冲刷，是适合于本工程的泄洪排沙运行方式。 |
| 英文摘要: |
| The structures to discharge flood and sediments for a gravity dam with the maximum height of 67 m consist of 4 overflow surface outlets and 2 bottom orifices,in which hydraulic jump is used for ener-gy dissipation. Due to the prominent problem caused by sediments in the reservoir,the priority operation to discharge flood and sediments is proposed by using the bottom orifices in the design. It is found that the energy dissipation in the stilling basin for the small and medium flood by fully opening the bottom orifices is insufficient due to low Fr in the pool as well as the low downstream water level in the full-scale physi-cal model tests. This also results in serious scouring for the downstream river bed apron. Hence,the opera-tion mode for the discharge structures is adjusted in such a way that the bottom orifices are half opened and surface outlet overflow is adopted. Further measurements in the full-scale physical model indicate that the energy dissipation in the stilling basin is significantly improved and the scouring to the downstream riv-er bed is eliminated, which suggests that the adjusted operation model can be applied to discharging the flood and sediments in the project. This study of the operation mode for the discharge structures can pro-vide a reference for similar projects. |
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