Abstract
The methodological basis for the development of a multi-factor digital model for selecting efficient and safe mine working support for given mining and geological conditions on the basis of the assessment of rock mass stability conditions depending on its fracturing and stress state when mining iron ore deposits of Gornaya Shoria is presented. The need to solve fundamentally new problems related to the application of various types of support systems is due to the changeover of mines to ore mining at great depths and classifying deposits as liable to rock-bumps. It is a very important factor, because a decrease in the stability of workings is associated with a high level of stresses in the deep levels being worked out, increased by bearing pressure, which ultimately leads to an increase in the cost of maintaining them. The developed multi-factor digital model “EvrazrudaKrep”, which is based on the results of the analysis of guidelines and instructions of the institutes such as All-Russian Research Institute of Mining Geomechanics and Survey, East Research Institute of Ore Mining, Mining Institute of Siberian Branch of Russian Academy of Science, T.F. Gorbachev Kuzbass State Technical University, as well as the mine working support experience in Russia and abroad, allows to quickly solve the problem of choosing a support and improving mining safety in complex mining and geological conditions.
Highlights
There are Temir-Telbes (Kaz, Kemerovo Region, Western Siberia, Russia) and Kondoma groups of iron ore deposits in Gornaya Shoria
Deposits are classified as liable to rock-bumps [4]. It was found by the research of East Research Institute of Ore Mining that the maximum main stresses in Tashtagol and Sheregesh deposits have north-west direction and are 2.5-3 times greater than the roof strata weight γH
Long-term practice shows that the basic variables affecting the choice of a support are: the stability of rock and ore masses, the hardness factor f according to the Protodyakonov scale of hardness, the structural weakness rate Кsw, the average distance between fractures Lav, the size of the zone of inelastic strain of rock mass around a mine working lв
Summary
There are Temir-Telbes (Kaz, Kemerovo Region, Western Siberia, Russia) and Kondoma groups of iron ore deposits in Gornaya Shoria. Deposits are classified as liable to rock-bumps [4] It was found by the research of East Research Institute of Ore Mining that the maximum main stresses in Tashtagol and Sheregesh deposits have north-west direction and are 2.5-3 times greater than the roof strata weight γH. In the course of the year, there are 3-4 bulk blasts with seismic energy of 108-109 J in the mines [2, 5] Under these conditions, the choice of an effective type of mine working support during the sinking cycle, taking into account its subsequent operation, is the most important task for ensuring the required safety of geotechnology for mining iron ore deposits in Gornaya Shoria [6, 7]
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