紫坪铺1号泄洪排沙隧洞挑流基岩冲刷模型试验研究

Study on Model Test for Estimating Scouring in Bedrock during Ski-jump Energy Dissipation at End of 1# Spillway Tunnel of Zipingpu Project

高土石坝中由导流洞改建而成的永久性泄洪洞,由于导流洞的高程低,泄洪落差大、流速高,水流对下游基岩的冲刷是需要充分重视的问题。模型试验是研究基岩冲刷的强有力的方法。将该方法应用于紫坪铺1号泄洪排沙隧洞挑流基岩冲刷中,取得了较好的效果,并分析了运用中所遇到的一些问题。

For high earth and rockfill dam , many permanent spillway tunnels are rebuilt from diversion tunnels due to high head and velocity. Model test is the most effective way to estimate scouring in bedrock and is used to give depth of scouring downstream of 1# spillway tunnel. And some problems encountered in practical application are analyzed .