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CONTRIBUTION OF THE NORTH-EASTERN FEDERAL UNIVERSITY TO DEVELOPMENT IN THE MINERAL MINING INDUSTRY AND PERSONNEL TRAINING
MINING-CONSTRUCTIONS WORK
ArticleName Special-type concrete for mine shafts under impact of highly mineralized and high-head groundwater in the zone of permafrost
DOI 10.17580/gzh.2016.09.15
ArticleAuthor Matveeva O. I., Fedorova G. D., Zyryanov I. V., Lobanov D. V.
ArticleAuthorData

YakutPNIIS, Yakutsk, Russia:

O. I. Matveeva, General Director, Candidate of Engineering Sciences

 

Ammosov North-Eastern Federal University, Yakutsk, Russia:
G. D. Fedorova, Associate Professor, Candidate of Engineering Sciences, fedorovagd@mail.ru

 

Yakutniproalmaz Institute, ALROSA, Mirny, Russia:
I. V. Zyryanov, Deputy Director of Scientific Work, Doctor of Engineering Sciences
D. V. Lobanov, Head of Laboratory

Abstract

The authors describe features of mine shaft construction and operation in Udachny Mine. It is found that the mine shaft lining concrete and the reinforced concrete of couplings will operate under aggressive attack of high-head groundwater and heavy impregnation. Salinity of groundwater reaches 400 g/l. Chemical composition of underground brines shows prevalence of chloride-magnesium salinization. Magnesium salt content in terms of ion Mg2+ in the brines varies from 4500 to 14250 mg/l. It is assumed that the brine is strongly aggressive relative to concrete with the water repellence grade W8 made of Portland cement and sulfate-resistant Portland cement. It is required to develop a special-type concrete with the pre-set performance В30W16. A probable mechanism of concrete corrosion under impact of underground brines and the effect of hydrostatic pressure on corrosion of concrete in mine shafts are studied. It is concluded that diffusion mechanism of corrosion of mine shaft lining is possible with the use of dense concrete (not lower than W16). The corrosion stability test procedure and results are presented for special-type concrete tested under hydrostatic head of 1.6 and 2.5 MPa. It is shown that the special-type concrete grade B30W17 with the placeability rank P5 can ensure stability of lining in mine shafts for their entire life, although there is a chance for diff usion transfer of aggressive liquid flows across the shafts and insufficient density of concrete joints of adjacent concreted couplings. Based on the research, recommendations are elaborated for corrosion proof of concrete in the shafts of Udachny Mine. Of the highest concern are the efforts toward ensuring the pre-set properties of concrete and additional waterproofing of concreting joints. The tested mix of the special-type concrete has been used in shafting in Udachny Mine.

keywords Permafrost zone, brine, hydrostatic head, mine shaft, concrete, corrosion
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Full content Special-type concrete for mine shafts under impact of highly mineralized and high-head groundwater in the zone of permafrost
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