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ArticleName Estimation of open-pit / underground mining cross-effect in complicated geomechanical conditions
DOI 10.17580/gzh.2021.01.10
ArticleAuthor Semenova I. E., Avetisyan I. M.

Mining Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia:

I. E. Semenova, Head of sector, Candidate of Engineering Sciences,
I. M. Avetisyan, Senior Researcher, Candidate of Engineering Sciences


The paper presents the results of prediction model studies of the stress–strain behavior in Gakman field of Yukspor deposit during hybrid open pit/underground mining under conditions of high tectonic stresses. The mountainous relief, rock mass faulting with a series of weak structures, geometry of the ore body, the actual and design parameters of stopes, and mining operation under the uncaved overlying stratum with three-sided support are taken into account. Based on the multivariate threedimensional stress–strain modeling using the finite element method, geomechanical substantiation of simultaneous open-pit and underground mining was carried out. It has been established that the geomechanical determinants in Gakman field are:
– gravitational and tectonic stresses with a significant excess of the tectonic component over the gravitational component;
– mountainous relief of ground surface with a significant elevation difference in the study area;
– location of underground mining under the uncaved overlying stratum with three-sided support;
– faulting of rock mass with a series of weak structures (Gakman fault);
– formation of the open pit and crown pillar above underground mine;
– significant lag of the mining front on the underlying levels of level + 320 m.
The dimensions of the cross-effect zone and crown pillar when the underground operations approach the open pit mine are determined.

keywords Tectonically stressed rock mass, stress–strain behavior, underground mining, open-pit mining, crown pillar, numerical modeling

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