Physical and Chemical Geotechnologies

Purpose

The goal is to determine the degree and quality of influence of the geometric and mechanical parameters of the laying of the excavated space of the mine workings on the state of the enclosing fine-layered rock mass in the interface area of the excavation and development mine workings provided there is no violation of the integrity of the rock layers by main cracks.

Methodology

The computational experiment consisted in calculating three options for laying the worked-out space of a cleaning development that was passed in a small-layer rock mass. The modeling of the objects of study was carried out in a three-dimensional representation with the realization of the conditions for the mutual slippage of the rock layers.

Findings

The results of calculations of the computational experiment made it possible to determine the nature of the change in the load on the lining of the excavation and cleaning workings under various conditions for laying out the developed space. An analysis of the stress field of the rock massif together with the deformations of the roof of the clearing generation showed the physical essence of the development of the processes of destruction of the rock layers when the geometrical and mechanical characteristics of the bookmark change. The analysis of the deformations of the rock layers made it possible to determine the conditions for the formation of softening zones and the conditions for the formation of main cracks for a particular combination of geological characteristics. Using to determine the effectiveness of the chosen mounting scheme of an integrated multi-criteria approach based on measurements of contour movements and internal fastening elements allows to evaluate the adequacy of the selected computational scheme when predicting changes in the state of the geomechanical system, which is definitely a new technique that evaluates the effectiveness of technological solutions adopted at the stage of underground design constructions.

The publication contains the results of studies conducted by President’s of Ukraine grant for competitive projects F-82 “Resource-saving parameterization of the waste-free technology of backfilling the produced space in coal mines”.

Keywords: modelling, waste utilization, underground mining, resource-saving technology

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