DefinePK

Abstract

A problem concerning improved stability of development mine workings under complicated mining and geological conditions of mines in Western Donbas has become extremely important. The tendency is the increase in coal extraction resulting in the fact that KSHPU-arched development mine workings become longer. Analysis of the state of mine workings in Western Donbas mines inclusive of the analysis of expenditures, connected with their construction, and maintenance, shows: the measures to prevent and cure the effects of floor rocks heaving, being a variety of deformation of neighbouring rock mass of mine workings, are the most labour-intensive processes while providing operational state of the mine workings. A process of a frame support bearing forcing in a floor of a mine working can be described in the form of a functional dependence between the reduced time interval of the support operation and a depth of its forcing in the mine working floor. To analyze the developed mathematical model, it is required to perform calculations on 160 combinations of the reduced rock strength and area of a foot bearings being used, i.e. four variations of the reduced strength; and 40 foot bearings (75 to 750 mm2) for each of them. Results of the field studies, described by the paper, have confirmed dependence between area of a support foot bearing and depth of its forcing in a mine working floor. Mathematical model, developed relying upon the data, makes it possible to forecast a depth of a support foot bearing forcing in a mine working floor during its operation in the context of various combinations of rock mass stress-strain properties and geometry of foot bearings being applied.