Experimental Research of Deformation of Mine Roadway Boundaries under Changes in Water Inflow
V. A. Driban, B. V. Khokhlo, S. V. Goldin, A. V. Antipenko
Republican Academic Scientific, Research and Design Institute for Mining Geology, Geomechanics, Geophysics and Mine Surveying-RANIMI, Donetsk, Russia
ranimi@ranimi.ru
Keywords: Wet rock mass, mine roadway, convergence velocity, stress-strain behavior, stability of mine roadways
Abstract
The article describes observations over variations in deformation rates in mine roadways under changes in average annual water inflow in mines in the Torez-Snezhnoe coal province of the Donbas. The great depth of occurrence of mine roadways contributes to the peak and post-peak stress conditions even in intact rock mass, which is aggravated by water inflow from the upper levels of mined-out and closed mines. Wetting of rocks reduces greatly their strength and increases velocity of displacement of mine roadway boundaries. A direct relationship is found between the change in the overall mine water inflow and the change in the deformation rate of the mine roadway boundaries. The described observation procedure enabled the retrospective geomechanical assessment of rock mass and proved to be efficient. The differences in the displacement velocities of boundaries in different roadways are governed by geological features of their occurrence, but the factor of wetting of enclosing rock mass plays an important role in intensification of deformation process.
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