Modeling interaction of rock mass and chemically anchored rock bolts to assess their load-bearing capacity in different fixation conditions

The article discusses structural and operational characteristics of chemically anchored rock bolts used to improve stability of underground excavations and to intensify primary mining. It is concluded that practical modeling of the rock bolt–rock mass system stability should include the strength and deformation characteristics of rocks, as well as the other attributes of the rockbolting efficiency, namely, the load-bearing capacity of the rock bolt rod material and the rock bolt anchorage strength. The article describes the stress–strain analysis of the rock bolt–rock mass system under static loading at different values of the rock bolt anchorage strength in a borehole. The results of the finite-element model analysis implemented in ANSYS are presented. The mechanism of the strength loss and the quantification of the stability factor in the rock bolt–rock mass system are described using the Mohr–Coulomb failure criterion. The calculations used the data from Yalevsky Mine of SUEK-Kuzbass. Based on the modeling results, it is proved to be feasible to quantify load-bearing capacity of rock bolt elements at the nonuniform anchorage strength distribution along their length.

Trofimov V. A., Filippov Yu. A., Zakorshmenniy I. M., Kharitonov I. L., Blokhin D. I. Modeling interaction of rock mass and chemically anchored rock bolts to assess their load-bearing capacity in different fixation conditions. MIAB. Mining Inf. Anal. Bull. 2023;(1):35-48. [In Russ]. DOI: 10.25018/0236_1493_2023_1_0_35.

V.A. Trofimov¹, Dr. Sci. (Eng.), Head of Laboratory, e-mail: asas_2001@mail.ru, ORCID ID: 0000-0001-9010-189X,
Yu.A. Filippov¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: filippov.yury@gmail.com, ORCID ID: 0000-0003-3347-677X,
I.M. Zakorshmenniy¹, Dr. Sci. (Eng.), Leading Researcher, e-mail: iosif-54@mail.ru, ORCID ID: 0000-0001-9153-673X,
I.L. Kharitonov, Cand. Sci. (Eng.), Deputy Technical Director, JSK «SUEK-Kuzbass», 652507, Leninsk-Kuzneckiy, Russia, e-mail: kharitonovil@suek.ru,
D.I. Blokhin¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: dblokhin@yandex.ru, ORCID ID: 0000-0002-4652-661X,
¹ Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia.

D.I. Blokhin, e-mail: dblokhin@yandex.ru.

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