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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

Bogumiła Pałac-Walko

First published: 2019-06-20https://doi.org/10.5593/sgem2019/1.3/s03.039View metrics

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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Publication details

Title
GEOMECHANICAL RISK ASSESSMENT FOR SALTROCK UNDERGROUND WORKINGS, USING STRENGTH THEORIES BASED ON SELECTED 2D AND TRUE 3D TRIAXIAL COMPRESSION LABORATORY TESTS
Authors
Bogumiła Pałac-Walko
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining
Publisher
STEF92 Technology
Year
2019
Pages
307-314
SWS Citekey
Palac-Walko20193307314
ISSN
1314-2704
ISBN
978-619-7408-78-2
Language
en
Publication type
Conference Paper
Keywords
room-and-pillarsalt-rockstabilityFEA
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