Deformation of Rock Mass in the Vicinity of Underground Opening at Great Depth
V. E. Mirenkov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
Keywords: Rock mass, depth, stress, underground opening, failure
Abstract
The article discusses natural stress field variation with depth. Rocks are assumed to be elastic. Increase in the stress level results in higher principal shear stresses but causes no failure. It is stated that failure is only possible at the increased lateral earth pressure coefficients, which induce hydrostatic stress redistribution at great depths. It is shown that Poisson’s ratio tends to 1/2 in isotropic rock mass.
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