Modeling of bearing massif condition during chamber mining of ore deposits

What is it about?

Purpose. To examine massif stress changes in hanging wall and footwall rocks of deposit during mining of primary and secondary stoping chambers. Methods. Analytical research of stress-strain state around stoping chambers was executed with usage of ther-modynamical method that gives the highest repeatability of calculated and measured elastic deformations at mine. Findings. Regularities of stress field formations in massif of stoping chambers unloading zones are specified. The main areas of stresses concentration that located in hanging wall and footwall rocks, in ore massif and backfilling are determined. Shape of radial stress isolines around stoping chambers reaches after ellipsoid one. The stress level of massif around hanging wall and footwall rocks, in unloading zones of stoping chambers changes on exponential dependences in terms of distance to ore deposit. Originality. Consists in usage of effect of massif weakening that contain primary and secondary stoping chambers for application rock stress value during determination of preparatory workings site. Practical implications. The stress level of rock around stoping chambers is defined and empirical dependen-cies of radial stresses values that take into account changes of mining operations depth and proximity from ore deposit contour are specified.

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