SELECTION OF METHODS FOR CONTROL OF MOUNTAIN PRESSURE IN MINING STRUCTURES OF THE CHAMBER DEVELOPMENT SYSTEM

Abstract

The paper presents the results of the formation of a stress
state in a rock mass using modern methods for calculating the stress-strain state of mountain structures. As a
result of the analysis, the distribution patterns of the
stress state distribution in the rock mass were revealed
when using chamber mining systems. Based on the example of the Gaysky underground mine, a set of active
methods for rock pressure management was formed.
The regularities of the formation of the stress state in the
peripheral massifs of the hanging and recumbent sides
during their exposure were revealed, in particular, it was
found that with the increase of the thickness of the ore
body, regardless of the angle of its incidence, a decrease
in the values of tensile stresses and an increase in compressive ones were established. We propose a new approach to determine the parameters of the mined-out
space of the extraction block, based on the revealed regularity of the increase of stresses in the chamber wall
until the size of the mined-out space is reached along the
strike of the calculated values; with a further increase in
the length of the mined-out space, stress stabilization is
to observe. Methods for controlling rock pressure based
on the revealed patterns, regulating static and dynamic
loads in structural elements of chamber development
systems, have been developed.
The causes for destruction of the hanging and recumbent
sides in this field are associated not only with the low
stability of the host rocks, but also with the presence of
high compressive tectonic stresses, which were determined by the authors. It should also not be forgotten that,
when mining a deposit with chamber development systems, the most loaded elements are the exposed part of
the hanging and recumbent sides, the ceiling, interchamber pillars and the bottom, therefore it is necessary
to take measures to ensure the stability of the ore massif
in order to guarantee the safety and efficiency of the
mining technology.