Research Article Open Access

QUALITATIVE ASSESSMENT OF STRAIN STRESS DISTRIBUTION OF ROCK MASSIF IN THE VICINITY OF PRE-DRIVEN RECOVERY ROOM

Abstract

In underground mining of flat-lying coal seams with the application of longwall mining systems, the downtime period of cleaning equipment during its face-to-face transfer is inevitable and has no relation to the reliability of the process flow chart. The downtime period, in some cases, may last two-three months, while technologically, the period of full dismantling does not exceed 20 days. Thus, the downtime period incurs substantial financial losses. The main cause of the dismantling work duration increase is roof rocks’ caving into the working area of the dismantle camera, as the rectification of its consequences is extremely labor-intensive. The geomechanical state of the roof rocks above the dismantle camera is in significant correlation with the technology of the dismantle chamber forming. The paper briefly reviews the forming technologies which currently exist. Basing on the computer simulation method, a geomechanical model is constructed demonstrating changes of the stressed and strained state of rocks in the adjacencies of the dismantling area, with the technology application of advance forming of the dismantle chamber with subsequent insertion of a longwall set of equipment into it. The findings enable to conduct the qualitative assessment of the changes of the rock massif’s geomechanical state when the longwall mining face approaches the place of its dismantling.

G.N. KARPOV AND A.V. LEISLE

To read the full article Download Full Article | Visit Full Article