Application of the HF, DRA and DCDA technologies for in situ stress determination in Iron Quadrangle rock masses.
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2021
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Resumo
This study presents an unprecedented campaign of measurements (magnitudes and orientations)
of the in situ stresses in itabirite rocks of the Brazilian Iron Quadrangle region using the hydraulic
fracturing (HF), deformation rate analysis (DRA) and diametrical core deformation analysis (DCDA)
methods. The previous studies of this rock mass consider estimated values of k, and the practice of
using in situ stress tests to support geotechnical analyses of the rock mass of this region has not
been adopted. The study site is located at a depth of up to 400 m around a pit. The rock mass under
study shows the presence of different geological structures, which made performing the tests
difficult. The DRA results show a marked difference compared to the HF and DCDA results; the
horizontal stresses were greater than the vertical stresses, which is a finding that may occur due to
local geodynamic influences. The results contribute to the understanding of the strains and
stresses induced by mining activities in the Brazilian Iron Quadrangle. For a better determination
of the regional in situ stresses in the rock mass of the Brazilian Iron Quadrangle, new HF tests, as
well as hydraulic testing of pre-existing fractures are recommended.
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Hydraulic fracturing, Deformation rate analysis, Diametrical core deformation analysis, Mining slope, Brazilian iron quadrangle
Citação
PENIDO, H. de A. Application of the HF, DRA and DCDA technologies for in situ stress determination in Iron Quadrangle rock masses. Geomechanics and Geoengineering, v. 16, 2021. Disponível em: <https://www.tandfonline.com/doi/abs/10.1080/17486025.2021.1955162>. Acesso em: 29 abr. 2022.