Effect of size of inclusions on shearing strength of frozen rock samples

Mining in the permafrost zone is typically carried out under negative temperatures, which conditions the higher strength of permafrost rocks and dictates their preliminary loosing blasting. After blasting, broken frozen rocks can regelate again, which affects operation of mining machines, up to their involuntary stop. Thus, it is critical to have a reliable estimate of strength of frozen overburden for the correct selection of an excavating machine as well as for the prediction of its mode and efficiency in given conditions. This paper presents the lab-scale shearing strength test data of frozen rocks in natural condition and after compaction under the pressure of 1.6 and 31. MPa at maximum and minimum values of moisture content and temperature and depending on size of inclusions. The tests of samples structurally comparable with broken rock mass show that the size of inclusions has no significant influence on strength of the samples at minimum moisture content and temperature. It is emphasized that broken permafrost rocks after regelation is a complex medium which possesses properties both of dislocated and uniform rock mass.

Maksimov M. S., Panishev S. V., Alkova E. L. Effect of size of inclusions on shearing strength of frozen rock samples. MIAB. Mining Inf. Anal. Bull. 2021;(12—1):139—147. [In Russ]. DOI: 10.25018/0236_1493_2021_121_0_139.

Maksimov M. S.¹, Junior Researcher, mexes_07@mail.ru;
Panishev S. V.¹, Cand. Sci. (Eng.), Leading Researcher, bsdpsv@mail.ru;
Alkova E. L.¹, Cand. Sci. (Eng.), Senior Researcher, nelealc12@rambler.ru;
¹ Mining Institute of the North named N. V. Cherskiy, Siberian Branch, Russian Academy of Sciences, Russia, the Republic of Sakha (Yakutia), 43 Lenin ave, Yakutsk, 677980.

Maksimov M. S., е-mail: mexes_07@mail.ru.

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