Uso das técnicas HCT e TDR no monitoramento do proceso de consolidação em reservatórios de barragens de rejeitos / Monitoring of consolidation process in deposits of tailings dam by TDR and HCT techniques

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The mining industry generates a large amount of tailing, which is usually placed in tailing dams. To properly design these constructions, when the tailing is highly compressible, it is necessary to study the consolidation characteristics of this material by means of techniques that consider large deformations. This study aimed to establish the technique HCT (Hydraulic Consolidation Test) in the laboratories of the department of Geotechnical Engineering, EESC-USP and consolidate the use of the technique TDR (Time Domain Reflectometry). This research work also aimed to evaluate the process of consolidation of clayey tailings through laboratory and field tests. For laboratory tests it was used the Hydraulic Consolidation Test (HCT) whereas field tests used the Time Domain Reflectometry (TDR) technique. The laboratory tests were carried out with samples collected in the spillway and next to the discharge spigot. Several analyses were performed using the HCT technique. The analysis results showed very little variations in the consolidation parameter values. The compressibility curve was determined using these consolidation parameters. The TDR tests were carried out using a probe specifically designed for this purpose. Laboratory calibration was performed with samples collected in the dam. One advantage of the TDR technique is to provide in real time estimates of the soil water content. With the water content profiles provided by the TDR technique, void ratio and effective stress profiles were determined using correlations obtained in laboratory, enabling to find a field compressibility curve. Then, the laboratory and field compressibility curves were compared, showing them very close to each other. It was concluded that both techniques are valid for evaluating the process of consolidation of soft materials in tailings dams.

ASSUNTO(S)

consolidação consolidation hct and tdr hct e tdr rejeitos tailing

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