Method to determine rock mass stresses in mining with blasting

The article offers to expand the scope of methods to determine stress state of rock mass. The theoretical formula is obtained to calculate stress state based on determination of diameter of the crushing zone (‘barrel’) after borehole charge blasting in rock mass. Blasting of an explosive charge in borehole generates certain pressure which, summed up with the pressure in rock mass, creates the crushing zone (fine fragmentation) around the borehole, which grows with increasing confining pressure. In Gubkin mine of KMAruda, the full-scale tests of the method are carried out with determination of physicotechnical characteristics of rock mass and geometrical parameters of ‘barrels’ and rock fragments. The tests included blasting of 55 boreholes at the level of 250 m at the depth of 445 m. The comparison of the test data on the ‘barrel’ diameters versus the ultimate compression strength of ferruginous quartzite with the calculations from the proposed formulas proves appropriateness of the formulas. The calculated stresses of rock mass using the blasting-assisted method (26.5–42.2 MPa) agree with the values obtained by VIOGEM using the method of stress relaxation at large spacing and the method of borehole slotting (15.0–40.0 MPa), which also proves appropriateness of the formulas. The blasting-assisted method of rock mass stress assessment is advantageous for swiftness and economic efficiency due to usability of process blastholes drilled in mine heading. These studies can be used to develop the method of rock mass stress assessment in blasting.

Keywords: rock mass stress state, heading, blasting impact, physical and mechanical properties, rock mass, jointing, explosives, blasthole, ‘barrel’ diameter.
For citation:

Tyupin V. N., Ponomarenko K. B. Method to determine rock mass stresses in mining with blasting. MIAB. Mining Inf. Anal. Bull. 2022;(8):27-37. [In Russ]. DOI: 10.25018/0236_1493_2022_8_0_27.

Acknowledgements:
Issue number: 8
Year: 2022
Page number: 27-37
ISBN: 0236-1493
UDK: 622.831
DOI: 10.25018/0236_1493_2022_8_0_27
Article receipt date: 10.02.2022
Date of review receipt: 23.05.2022
Date of the editorial board′s decision on the article′s publishing: 10.07.2022
About authors:

V.N. Tyupin1, Dr. Sci. (Eng.), Professor, e-mail: tyupinvn@mail.ru, ORCID ID: 0000-0002-3709-0957,
K.B. Ponomarenko1, Graduate Student, VIOGEM, Laboratory of Rock Pressure and Rock Displacement, Belgorod, 308007, Russia, e-mail: ponomarenkokb@yandex.ru, ORCID ID: 0000-0003-1745-9670,
1 Belgorod State National Research University, 308015, Belgorod, Russia.

 

For contacts:

K.B. Ponomarenko, e-mail: ponomarenkokb@yandex.ru.

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