Mirny Polytechnic Institute (Branch), Ammosov North-Eastern Federal University, Mirny, Russia:

I. V. Zyryanov, Head of Chair, Professor, Doctor of Engineering Sciences
V. V. Pul, Assistant

Yakutniproalmaz Institute, PJSC ALROSA, Mirny, Russia:

O. V. Zoteev, Chief Researcher, Professor, Doctor of Engineering Sciences, zoteev.o@mail.ru
V. D. Baryshnikov, Chief Researcher, Candidate of Engineering Sciences

Geology of the Internatsionalnaya kimberlite pipe operated by ALROSA is characterized. The method of development of the deposit is described— the top of the pipe has been mined out using the open pit method. The deeper level reserves are extracted by cut-and-fill stoping with cemented backfill, mainly top-downward. The dominating feature of mining conditions of the Internatsionalnaya pipe is the presence of a thick regional aquifer in the section, which greatly complicates mining operations. To prevent flooding of the underground mine before commissioning of the drainage level, protecting pillars were left above and below the aquifer, as well as below the open pit. The article discusses geomechanical processes that can damage the protecting pillars in the course of mining, presents the monitoring system and the structure of the required observations, as well as describes approaches to the selection of safety criteria for geomechanical processes. Both analytical solutions and numerical modeling of stress state in the bottom of the protecting pillar were used for determining safety criteria. Based on the studies performed, the hydrogeomechanical monitoring project has been developed, which is currently being implemented in the underground mine after appropriate industrial safety expert evaluation.

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