Sotskov, V. O. та Dereviahina, N. I. (2020) RESEARCH OF DEPENDENCIES OF STOPE STRESS-STRAIN STATE CHANGE UNDER VARIOUS CONDITIONS OF PARTIAL STOWING OF DEVELOPED SPACE. Topical scientific researches into resource-saving technologies of mineral mining and processing. с. 305-325.

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Title in English

RESEARCH OF DEPENDENCIES OF STOPE STRESS-STRAIN STATE CHANGE UNDER VARIOUS CONDITIONS OF PARTIAL STOWING OF DEVELOPED SPACE

English abstract

The main goal of the paper is to determine the optimal parameters of stope roof deformation depending on different mining and geological conditions for a selected technological scheme of stowing, as well as load distribution in structural elements of powered roof supports for selecting the optimal configuration of the stoperoof support unit. Modelling is performed for three variantsof stope stowing when the stope is developed through a thinly stratified rock massif under different mining and geological conditions in a three-dimensional representation with realiza-tion of conditions for mutual slipping of rock strata. It is determined that the de-signed unit of powered roof support allows overcoming structural features of a roof support used during partial stowing by increasing the safety margin of elements supporting the tail console. The safety marginincreaseis achieved by introducing additional rigid structural elements what reduces the level of stress concentration in joints of a roof support structure.Using an integrated approach to determine the effi-ciency of selected roof supporting scheme allows estimating reliability of the select-ed modelling scheme when predicting changes in a state of a geomechanical system. This is a new method for evaluating the efficiency of various technological solu-tions. The results indicate that when using packs, a process of crack formation in an immediate roof of stopesis stopped by localizing areas and stress values that con-tribute to growth of main cracks.The optimal selection,from astandpointof dynamic stabilityof animmediate roof of stopes and packs, isselection of the minimum per-missible height of extracted rocks while ensuring a statistical equilibrium of sides of packs.This allows determininga mechanism ofselection of stope movement velocity, a type and geometric parameters of erected packs.

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