Model Test on Uplift Force of Pervious Floor with a Keyway
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Abstract:
To protect the downstream river bed and bank slope of the high dam from the serious erosion by high-speed flood flow, which will endanger dam safety, it is necessary to build all kinds of stilling pond protective structures as the first line of defense for dam safety. The security of all types of stilling pond protective structures is the premise for the safety of high dam flood discharge. As the studies on downstream protective works of the high dam dig deeper, floors of different structural forms have been proposed, such as the stilling pond floor with a keyway and the pervious floor, to increase the stability of the stilling pond. The form of the stilling pond also transformed from the "passive protection" model to the "active protection" model. This paper studied the pervious floor with a keyway that combines "active protection" with "passive protection". A model test was conducted to analyze the uplift force in terms of the maximum value, probability density distribution, amplitude, and power spectrum. The results showed: In comparison with the floor with a keyway, increasing permeable holes can reduce the uplift force. The probability density distribution of the uplift force basically conforms to the normal distribution. The magnitude of the uplift force is reduced. The power spectral density is even closer to a low frequency.
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