Influence of rock fractures and block boundary weakening on cavability.
Mahtab MA; Dixon JD
Trans SME AIME Ann Mtg New York 1976 Feb; 260:6-12
The results of a parametric study of the influence of natural features (stress field, rock strength, and strength and orientation of fractures) as well as the influence of induced features (undercut span, boundary slot, and other boundary-weakening measures) on the cavability of an undercut block of ore in mining by the block-caving method are presented. The two-dimensional finite-element analysis technique was used for this study. A coarse "mesh," along with linear homogeneous assumption for rock properties, was used to model the problem of initiation of caving in a block of ore. Interpretation of the test results suggests that weakening the "abutments" of the block as well as certain orientations of natural fractures exercise significant influence on cavability. These findings hold promise for immediate application to known situations in block-caving mines.
OP; Conference/Symposia Proceedings
Trans. SME, AIME Ann. Mtg., New York, February 1975,