The slab instability of a stilling basin caused static effect of hydraulic jump
LUO Guanyong1，2，CAO Hong1，2，PAN Hong1，2
(1. School of Civil Engineering and Transportation，South China University of Technology，Guangzhou，Guangdong 510640，China； 2. State Key Laboratory of Subtropical Building Science，South China University of Technology，Guangzhou，Guangdong 510640，China)
Abstract：Occurrence of a hydraulic jump can reduce the balance weight of a slab in a stilling basin. Ignoring them would result in a dangerous situation. In this paper，a slab failure case，which occurred in Guangzhou is examined carefully by numerical simulation. The method to locate a hydraulic jump and that to simulate the draining holes were addressed in details. The restoration and its effect is also discussed. It found that，(1) the occurrence of a hydraulic jump both reduces the balance weight of a slab and changes boundary condition for seepage flow significantly. (2) It is the ignoring the static effect of a hydraulic jump that makes the failure happen. (3) Draining holes in the slab reduce the water pressure difference between the top and bottom and eliminate the static effect. (4) For a slab with draining holes，stability analysis without taking into account the hydraulic jump static effect is acceptable for its result is on the safe side.
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2016, Vol. 35 
