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- W2105445504 abstract "Abstract The stability of underground openings excavated in a blocky rock mass was studied using the discontinuous deformation analysis (DDA) method. The focus of the research was a kinematical analysis of the rock deformation as a function of joint spacing and friction. Two different opening geometries were studied: (1) span B = h t ; (2) B = 1.5 h t ; where the opening height was h t = 10 m for both configurations. Fifty individual simulations were performed for different values of joint spacing and friction angle. It was found that the extent of loosening above the excavation was predominantly controlled by the spacing of the joints, and only secondarily by the shear strength. The height of the loosening zone h r was found to be dependent upon the ratio between joint spacing and excavation span S j / B : (1) h r B for S j / B ⩽ 2/10; (2) stable arching within the rock mass for S j / B ⩾ 3/10. The results of this study provide explicit correlation between geometrical features of the rock mass, routinely collected during site investigation and excavation, and the expected extent of the loosening zone at the roof, which determines the required support." @default.
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- W2105445504 date "2006-01-01" @default.
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- W2105445504 title "Tunnel roof deflection in blocky rock masses as a function of joint spacing and friction – A parametric study using discontinuous deformation analysis (DDA)" @default.
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- W2105445504 doi "https://doi.org/10.1016/j.tust.2005.05.001" @default.
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