Reduced hydraulic model of Forquilha IV tailings dam

Teixeira, Eder Daniel; Franca, Paulo Ricardo Behrens; Viana, Edna Maria de Faria; Faria, Marco Tulio Correa de; Saliba, Aloysio Portugal Maia; Martinez, Carlos Barreira

doi:10.1590/0370-44672015680187

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Civil Engineering • Rev. Esc. Minas 68 (1) • Jan-Mar 2015 • https://doi.org/10.1590/0370-44672015680187 copy

Reduced hydraulic model of Forquilha IV tailings dam

Modelo hidráulico reduzido da barragem de rejeitos Forquilha IV

Authorship SCIMAGO INSTITUTIONS RANKINGS

This paper presents the development of a reduced hydraulic model (RHM) for the outflow operating system at the Forquilha IV (scale 1:10) tailings dam, owned by Vale S.A. The studies were performed by Centro de Pesquisas Hidráulicas e Recursos Hídricos (CPH) of Universidade Federal de Minas Gerais (UFMG) and the company Vogbr Recursos Hídricos & Geotecnia Ltda. We present here a brief description of the model construction and the test battery set for the structure’s hydraulic analysis. RHM involves the hillside culvert, the dissipation box and the exit to the restitution tunnel. The RHM project represents an essential step in the first analysis of the hydraulic behavior of the prototype, considering the designed flood station (ten thousand-year flood flow), as well as the analysis of its operation with more frequent flows.

Reduced hydraulic model; tailing dam

	Characteristic	Model	Prototype
Hillside culvert	Internal section	Rectangular (15 cm x 18 cm)	Rectangular (1.5 m x 1.8 m)
	Extension	≅ 9 m	≅ 90 m
	Elevation	≅ 3.5 m	≅ 35 m
Water intake towers	Characteristic	Model	Prototype
	Quantity	06	06
	Internal section (throttle section)	Square (15 cm x 15 cm)	Square (1.5 m x 1.5 m)
	Altura	50 cm	5.0 m
Transition box	Characteristic	Model	Prototype
	Internal section	Rectangular (15 cm x 41 cm)	Rectangular (1.5 m x 4.1 m)
	Extension	2.15 m	21.5 m

Test	Flow (prototype values - m³/s)	Flow (model values - l/s)	Total of tests
Towers 01; 02; 05	0.95	3	3
	1.58	5	3
	3.16	10	3
	4.74	15	3
	6.32	20	3
	7.91^* * Flow rate corresponding to a ten thousandyear flood.	25^* * Flow rate corresponding to a ten thousandyear flood.	3
	9.49	30	3
Total of tests			21

Tests	Flow (prototype values - m³/s)	Flow (model values - l/s)	Total of tests
Towers 01 and 02; 02 and 03; 05 and 06	0.95	3	3
	1.58	5	3
	3.16	10	3
	4.74	15	3
	6.32	20	3
	7.91^* * Flow rate corresponding to a ten thousand year floodwater.	25^* * Flow rate corresponding to a ten thousand year floodwater.	3
	9.49	30	3
Total of tests			21

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[TFN01] ^*
Flow rate corresponding to a ten thousandyear flood.