Fiber-reinforced concrete testing procedure

The problems connected with difficult conditions and higher rates of mining can be solved using new types of mine support. In particular, the monolithic concrete lining can be replaced by the shotcrete lining advantageous for the higher tension strength. Fiber-reinforced shotcreting requires knowing the load-bearing capacity of the material. The ultimate load-bearing capacity of fiber-reinforced shotcrete is assumed as the value at which the structure loses ability to resist loading and fails. In order to find this value, it is required to examine the postlimit deformation parameters which are unstated in the regulatory documents. Within the framework of this research, numerical modeling of the plastic behavior of fiber-reinforced concrete was performed using the lab-scale test data. The three-point bending tests and the uniaxial tension tests of a concrete structure are modeled. Based on the experimental data, the post-limit deformation domain longitudinally the test specimens is plotted in the axial stresses–fracture width coordinates. The obtained data can be used as the model parameters of the plastic behavior of concrete during accumulation of defects to determine the mine support load-bearing capacity.

Tulin P. K., Ochkurov V. I., Shubin A. A., Sotnikov R. O. Fiber-reinforced concrete testing procedure. MIAB. Mining Inf. Anal. Bull. 2021;(8):129-141. [In Russ]. DOI: 10.25018/0236_1493_2021_8_0_129.

P.K. Tulin¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Tulin_PK@pers.spmi.ru,
V.I. Ochkurov¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Ochkurov_VI@pers.spmi.ru,
A.A. Shubin¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Shubin_AA@pers.spmi.ru,
R.O. Sotnikov¹, Graduate Student, e-mail: ross61@mail.ru,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

R.O. Sotnikov, e-mail: ross61@mail.ru.

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