小湾水电站施工导流水力学模型试验研究

The Hydraulic Model Test Research on Construction Diversionand Cofferdam Erosion of Xiaowan Hydropower Station

根据小湾工程的实际情况、设计资料及导流指标,系统的分析了导流隧洞进出口处的河床堆渣及围堰爆破拆除后的堆渣对导流隧洞过流能力的影响和导流隧洞的冲渣能力;下游围堰坡脚处回流流速分布及对岸坡和坡脚冲刷的特性与程度。通过水力学模型试验研究,制定切实可行的导流方案及相应的保护措施,预测导流过程中可能出现的技术问题,为工程施工导流实施提供科学依据。

According to the practical conditions and the design indexes of the Xiaowan project the diversion model test was made in study of the influences of the blasting remains and riverbed remains on the discharge capacity of diversion tunnel, the hydraulic scour capacity of diversion tunnel, the velocity distribution of backflow near the cofferdam foot, and erosion characteristic. Also the viable diversion scheme and the corresponding preventive measures were put forward. The diversion model test predicted some potential technical problems, and provided guidance for the construction of the practical project.