Factors influencing the characteristics dependence of zonal structure rock failure around lined opening

Abstract

For the safe mining operations, it is necessary to take into account a large number of negative factors, one of which is zonal failure (disintegration) of rocks that occurs after developing deposits at great depths.Therefore, investigation of the behavior of zonal mesostructures regularities around deep mine openings is relevant.In this paper dependences from influencing factors of the first failure zone radial extent, of the depth of the contour zone and the first failure zone merging, and the depth of the second failure zone appearance are established based on the non-Euclidean model of the zonal failure rock mass around deep lined openings and the Odintsev’s criterion of the failure under compression.The influencing factors are the uniaxial compression strength of the rock σс (MPa); the opening depth H (m); the ratio of empirical coefficients γ3 / γ1 ; the values of the rocks elastic modulus, E, and the Poisson’s ratio, γ. The study was carried out both for hard and weak rocks at values resistance of support 0.5 and 1 MPa.

Keywords

• Lined opening
• Rock mass
• Zonal failure
• Non-Euclidean model
• Depth of zones merging