Physical and Chemical Geotechnologies

Purpose

Substantiation of method forecasting of manifestation rock pressure in the system «layered massif – working support» based on the detection of patterns displacement any point of circuit the preparatory working during the simulation experiments.

Methodology

Carrying out the simulation experiments were performed on the basis of the finite element method using the solid computational domain, provided transcendent non-linear behavior of the simulated material. The use of numerical grid methods allows creating geometrically and physically complex simulation models and manipulate them state in a wide range.

Findings

The calculations were defined that the weak links between adjacent layers, acting shear stresses destroy them in the vicinity of working, and related rock layers deform with slide concerned to each other. Analysis of reduced stress area allow to substantiate with sufficient accuracy for mining settlements averaged single structure of computational domain that most reflects all the main features of a real mining massif, having influence on the inaccuracy of calculations. This choice provides the scale contributed of inaccuracy within 10% in entire range of change mechanical parameters rock layers of the rock massif.

Originality

Stress-strain state frame support and patterns of change with increasing depth are non-linear, especially when passing nearby rock layers in the transcendental state; creation system of plastic hinges on a contour frame support furthers the development of its movements, which except the possibility of further exploitation working.

Practical implications

The elaborated method allows to determine the optimal indicators of maintaining working driven in the fine-grained rock massif, which allows to significantly reduce operating costs.

Keywords: working, stress-strain state, frame support, nonlinear deformation, the rock massif

References

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