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GEOMECHANICAL RISK ASSESSMENT FOR SALTROCK UNDERGROUND WORKINGS, USING STRENGTH THEORIES BASED ON SELECTED 2D AND TRUE 3D TRIAXIAL COMPRESSION LABORATORY TESTS
Abstract
Mining operations performed within the northern part of of deep copper Polish mines are associated with a relatively thick (up to 200 m) and broadly extended salt rock stratum. Since in the above area of planned copper ore exploitation large salt chambers exist and new ones will be mined-out, their safe dimensions have had to be found. The understanding of the mechanism of interaction between the workings? elements such as pillars and immediate roof strata excavated within the salt-rock body, required developing a multiparameter numerical analysis involving rheological aspects of the system behavior. The utilized laboratory based time-dependent saltrock deformation parameters were verified using back calculation procedure based on three-dimensional FEA. This enabled a comparative geomechanical risk assessment study utilizing Hoek-Brown hypothesis based on conventional triaxial tests performed in the Karman?s axially symmetric conditions and Mogi?s strength theory based on so called ?true? 3D triaxial compression laboratory tests. The entire rock mass included in the FEM model has been examined from the safety level point of view as well as the effect of salt pillar size on the potential of a pillar-roof strata stability has been discussed.
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References9
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