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放空水库时,库水位降落速度的大小对土坝上游坝坡的稳定性有很大影响。因此,在进行坝坡稳定分析前,一般要先计算库水位的降落速度。由于水库放空过程中放空隧洞的水流为不稳定流,工程上常采用分段综合平均法以近似估算库水位的降落速度。即:将水位降落的总水头分为若干段,设每段的出流为稳
When emptying the reservoir, the magnitude of the reservoir water level drop has a great influence on the stability of dam slopes upstream of the earth dam. Therefore, before proceeding to the slope stability analysis, it is generally necessary to calculate the landing speed of the reservoir water level first. As the water flow in the empty tunnel during the venting process of the reservoir is unstable, the integrated average method is often adopted in the project to approximate the landing speed of the reservoir water level. Namely: the total head of water level landing is divided into several sections, each section of the outflow is stable