Resumo

GONZALEZ-BETANCOURT, Mauricio  e  POSADA-GARCIA, Lilian. Effects of joints and their waterstops on pressures spread over a slab subject to turbulent flow on a horizontal apron. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.197, pp.94-103. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v83n197.47579.

Analyses of measured pressures using multiple sensors above and below a slab subject to supercritical flow and hydraulic jump are presented. Pressures were measured in a physical model constructed in the Hydraulic Laboratory of the Universidad del Valle in Cali, Colombia. Details such as expansion joints, waterstops, slab thickness, and soil-slab separation were simulated. Inflow was full and partially developed, with Froude numbers ranging from 2.84 to 11.6. The role of the expansion joints and waterstops in the generation of uplift pressure and hydraulic gradient below the slab were identified using pressure fields above and below the slab, in multiple tests. The results of this research are critical for the design of bottom slabs in hydraulic structures, which are required to withstand uplift forces and prevent internal erosion problems.

Palavras-chave : uplift pressure; hydrodynamics uplift; slabs; hydraulic model; stilling basins.

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