Abstract
The publication examines the problems of concentrator of elevated tension formation in pillars and ore massif. The article presents the results of modeling the stress state of interchamber pillars and ore deposits, using specialized geomechanical software PRESS 3D URAL. In the process of numerical experiments, it was found that the increase of natural flexibility in pillars leads to a decrease of normal stresses in comparison with the variant of a stiff scheme. If interchamber pillar involves different varieties of ores, there is a redistribution of stress on the site with more stiff ores. The article shows that the stress state control of interchamber pillars and ore massif in conditions of OJSC «Sevuralboxitruda» can be achieved by drilling relief holes.
Highlights
Forecasting the stress state of the rock mass is a very important task to ensure the safety of mining operations for many mining enterprises. [1-8]
The value of additional loading on rigid section is an average of 20% compared with the variant, characterizing the uniform strength of interchamber pillar
An increase in natural flexibility of interchamber pillar leads to a decrease in normal stresses, acting in it by 1.4 times compared to the variant of the rigid scheme
Summary
Forecasting the stress state of the rock mass is a very important task to ensure the safety of mining operations for many mining enterprises. [1-8]. A significant tension increase in process of approaching the stopping front get areas with less thickness and greater strength of ore deposits The increase in normal stresses, acting in massif, in areas with more strength varieties of bauxite ore, determines their ability to accumulate significant elastic energy. In the areas of the ore deposit, represented by less strength varieties of ores, as a rule, there is a process of active cracking, fracturing, which indicates a gradual withdrawal of latter from under the load and its redistribution to neighboring stronger areas. The situation becomes more complicated in the case of using room and pillar development systems. This problem is relevant for mining enterprises, developing Severouralsk bauxite basin (OJSC «Sevuralboksitruda») in complex geological, mining and technical, geodynamic conditions
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