Abstract
The results of instrumental and visual assessment of near-rock massif and anchor support elements state in the conditions of long-term maintenance of mine workings has been presented. Particular attention is paid to underground mines in a flooded state. The result of various profiles fixing bolts strength tests of in the roof and sides of the workings has been presented. It has been established that the probability distribution of the anchoring bolts force in the holes in roof of the workings obeys the normal distribution tendency. The result of a radar survey of roof rocks using the Georadar OKO-2 has been analyzed. It was revealed that the height of the stratification of rocks in the mine workings roof varies from 0.2 m to 2.25 m, a comparison is made with the theoretical height of the collapse arch. The propensity of the near rock massif to water saturation has been estimated, the height of the water saturation of the roof rocks has been established. It has been established that the height of moisture depends on the arch of rock stability formed during the survey period. It has been found that water saturation of the rocks leads to a decrease in the specific cohesion of the resin capsules bonding composition with the walls of the hole by 55-67% in roof and by 72% in walls of mine workings.
Highlights
The tragedy that occurred in May 2010 at the Raspadskaya mine caused to enormous human casualties and dramatic damage to the capital funds of the mine itself
Using the mathematical expectation values it could be possible to determine the specific cohesion of the fastening structure of chemical ampoules with shot walls and bolts
It is clear that water saturation leads to a decrease in the actual strength of bolts fixing in holes by 37% when fastened in sandstones and by 48% when fixed in siltstones
Summary
The tragedy that occurred in May 2010 at the Raspadskaya mine caused to enormous human casualties and dramatic damage to the capital funds of the mine itself. As a result of the impact of the blast wave, high temperature and flooding, the support of a significant part of the underground mine workings of the mine was broken. It should be noted that work to eliminate the consequences of the accident at the mine is ongoing. The primary goal of the study is to assess the effect of the blast wave and flooding on the state of anchoring of mine workings. The object of the study was underground mine workings of Raspadskaya coal mine, exposed to blast, heat and flooding. The planned volume of the study included workings carried out in the coal seams: 3-3a, 7-7a, 9, 10.The total length of the surveyed mine workings was about 60 km
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