通过水工模型试验，对糯扎渡水电站溢洪道水垫塘护坡不护底方案进行了可行性研究。在水垫塘平底板（护底）情况下，根据测试出的时均压力、脉动压力和上举力分布分析了底板及边坡的稳定性，以及可能破坏的范围；在水垫塘护坡不护底情况下，研究了各泄洪工况下水垫塘底部及坡脚的冲（淘）刷形态，最大冲（淘）刷深度；在此基础上，分析了水垫塘坡脚淘刷原因，提出了水垫塘的优化布置体型，即扩宽 水垫塘并加设护坡台板。试验结果表明，优化后的水垫塘采用护坡不护底方案是可行的。

A feasible research on cushion pool of Nuozhadu Hydro power Station with lining slope but without bottom protection is carried out by a hydraulic model with a scale 1∶100. With bottom protection, the stability and possible destructive zone of bottom and slope of the cushion pool are studied according to time - average pressure, fluctuating pressure and uplift force. With lining slope but without bottom protection, the scouring shape and maximum scouring depth of the pool bottom and toe are measured under various working cases, damage causes of the toe are analyzed, and an optimized scheme, i.e., appropriately enlarging width of the cushion pool and adding a bedplate protection, is proposed. The test results show that this scheme is feasible. 