ABSTRACT

Abstract: The El Toro Underground Mine is located in the Central Cordillera of the Colombian Andes. The target for mining is a marble body interbeded by schistose rocks. The multiple tectonic processes with low-grade metamorphism have resulted in complicated geological structures, which give anisotropy and heterogeneity in the rock mass condition as well as in their geomechanical properties. Especially remarkable planar structures, some of which were folded, are recognized with discontinuities in both, schistose rocks and marble. Typical planar structures and relating discontinuities are NW-SE trend with steep dip. Anisotropy are related to the variation of values in some geomechanical properties in the marble body as well as in the schistose rocks depending of the dip angle between planar structures and the value of such geomechanical properties measured in the laboratory. Heterogeneity is recognized in some parameters due to variation in the location of the samples and their value measured in laboratory tests.

Keywords:
wellbore integrity, strength, metals & mining, Upstream Oil & Gas, Reservoir Characterization, Wellbore Design, reservoir geomechanics, Engineering, heterogeneity, dip angle
Subjects:
Wellbore Design, Reservoir Characterization, Wellbore integrity, Reservoir geomechanics
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2000. A.A. Balkema - Permission to Distribute - American Rock Mechanics Association
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