CHANGING OF GEOMECHANICAL PARAMETERS OF GAS-SATURATED COAL-ROCK MASSIF UNDER GAS-DYNAMIC PHENOMENA

UDC 622.831.332:551.24

Authors:

KrukovskiyA.P., D.Sc. (Tech.), Senior Researcher,

Krukovskaya V.V., D.Sc. (Tech.), Senior Researcher

(IGTM NAS of Ukraine)

Abstract.

Time-dependent coupled processes of elastoplastic changes in the stress-strain state of fractured porous medium and methane filtration around a separate tunnel in the prone-to-outburst and undisturbed areas are considered in the article with taking into account impact of interaction between principal stress tensor components on permeability changes in the rock massif.

Distribution of values of the parameters which characterize difference between components of the stress field and rock pressure relief in the massif, and methane pressure in different time points are shown. It is further shown that geomechanical and filtration processes are in dynamic mode in the disturbed area of the coal seam near tectonic fault, and in a quasi-stationary mode in the undisturbed area.

Graphs of geomechanical parameters of coal seam in the undisturbed zone and in the moving front of destruction show behavior of the gas-dynamic phenomena in time. It is shown that maximum difference component of the stress field, as well as maximum stress during the first 8 seconds moves away from the face at a distance of about 2 meters per every 2 seconds at the dynamic mode of processes. It corresponds to destruction cavity increase at the stage of the outburst progress. Then, rate of the deflected mode change reduces in the front of destruction, growth of destruction cavity is slowing, and gas-dynamic process proceeds to step attenuation.

Keywords: gas-dynamic processes, changing of the stress state, methane filtration.

References:

1. Shevelev, G.A. (1989) Dinamika vybrosov uglja, porody i gaza [The dynamics of outbursts of coal, rock and gas], Nauk. dumka, Kiev, SU.

2. Krukovskaya V.V. and Krukovskiy A.P. (2008) “The simulation of the coal and methane outburst near tectonic faults of different types”, Geo-Technical Mechanics, no. 80, pp. 238-250.

About the authors:

Krukovskiy Alexander Petrovich, Doctor of Technical Sciences (D. Sc), Senior Researcher, Deputy Director of the Institute, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, Этот адрес электронной почты защищен от спам-ботов. У вас должен быть включен JavaScript для просмотра.

Krukovskaya Victoriya Victorovna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Pressure Dynamics Control in Rocks, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, Этот адрес электронной почты защищен от спам-ботов. У вас должен быть включен JavaScript для просмотра.