长江上游丁坝坝根水毁过程的试验研究

Experimental study on damage causes of spur dike's root in the upper Yangtze River

通过概化模型试验对不同来流量、不同水深及不同坝长条件下丁坝坝根的水毁过程及现象进行观测,并对不同工况下坝根的水毁情况进行对比分析,得出长江上游丁坝坝根水毁的原因。结果表明:来流量的大小对丁坝坝根的水毁影响最为直接,其次是丁坝坝长,通过影响坝体周围的水流结构间接影响坝根的水毁,而水深对其影响仅限于刚淹没状态,当水深高于坝上3 cm时,坝根处水毁已不明显。

Adopting model test research method, we observe the damage process of the spur dike＇s root under different flow, different water depth and different length of the spur dike, analyze comparatively the damage degree of the dike root in different working conditions, and find out the damage causes of the spur dike＇s root in the Upper Yangtze River.The experimental result shows that the flow is the direct factor for the washout, the length of spur dike affects the flow around the dam indirectly through affecting the flow structure surrounding the dam, and the water depth influences the root damage only when it is just submerged.When the water depth is 3 cm above the dam, the washout phenomenon is not obvious.