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>Room-and-pillar mine workings design in high level horizontal stress conditions. Case of study from the Polish underground copper mines
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Room-and-pillar mine workings design in high level horizontal stress conditions. Case of study from the Polish underground copper mines
Numerical experiments modeling different three-dimensional mine layout were performed, using two boundary condition sets defined by presence or absence of horizontal additional stress. The determined stress/deformation states were used afterwards for quantitative characterization of the effect of horizontal tectonic stress on system behavior. Local rock mass load intensity and the related failure possibility were assessed using the indicators called safety margins related to several well known failure criterions such as: the maximum principal stress’, Coulomb-Mohr’s, and true triaxial strength theories. The safety margins’ spatial distribution served then as a basic measure helpful in identifyng areas of higher failure risk. The analysis permitted selecting the safest mining layout of the three considered, and recommend it for the practical development in one of the Polish underground copper mine.
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