Modeling of bearing massif condition during chamber mining of ore deposits
O. Khomenko1 , M. Kononenko1 , М. Danylchenko1
1 Underground Mining Department, National Mining University, Dnipropetrovsk, Ukraine
Min. miner. depos. 2016, 10(2):40-47
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Purpose.To examine rock mass stress changes in hanging wall and footwall rocks of the deposit during mining of primary and secondary stoping chambers
Methods. Analytical research into stress-strain state around stoping chambers was executed with the help of thermodynamical method that gives the highest convergence of calculated elastic deformations and those measured in the mine.
Findings. Regularities of stress field formations in the mass of stoping chambers unloading zones are specified. The main are-as of stresses concentration located in hanging wall and footwall rocks, in ore mass and backfilling are determined. The shape of radial stress isolines around stoping chambers tends towards ellipsoid. The stress level of mass around hanging wall and footwall rocks, in unloading zones of stoping chambers changes according to exponential dependences relating to the distance from ore deposit.
Originality. Consists in capitalizing on the rock mass weakening effect which hosts primary and secondary stoping chambers for using rock stress value for determination of development workings site.
Practical implications. The stress level of rocks around stoping chambers is defined and empirical dependencies of radial stresses values alterations in terms of changes of mining depth and proximity from ore deposit contour are specified.
Keywords: theoretical research, mass unloading zone, stress-strain state, chambers of primary and secondary mining stage, radial stresses
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