Empress Catherine II Saint-Petersburg Mining University, Saint-Petersburg, Russia

I. I. Bagautdinov, Leading Researcher, Candidate of Engineering Sciences, bagautdinov_ii@pers.spmi.ru
O. Yu. Loktyukova, Leading Engineer
A. N. Shabarov, Director, Doctor of Engineering Sciences

The article considers some approaches to numerical modeling of rockburst tectonic faults. Much attention is paid to the zones of secondary fracturing that form in the vicinity of a shearing zone under the action of plastic deformations, usually at the initial stage of loading (Riedel shears). The authors propose to model such faults using the advanced model of geomaterials—Concrete. An important feature of this model is the ability to take into account the change in strength and deformation characteristics over time, strain hardening and softening of the material under the action of both tangential and tensile stresses, shear creep and volume shrinkage. The parametric support of the model of geomaterial behavior is made based on the results of laboratory tests at the Mining University. The forecast of propagation of Riedel shears is presented in the form of the plastic deformation profiles in rock mass. The authors have found out that the magnitude of the fracture development angle largely depends on the actual roughness of the main fracture fault, of course, with regard to the scale effect. Thus, for a conventionally rectilinear main fault (JRC=0), the propagation angles of Riedel shears (secondary fractures) are in the range from 39 to 55 degrees. The obtained results are confirmed by field observations of other researchers, which indicates the potential for practical application of the proposed approach after some additional research.

The research was supported by the Russian Science Foundation, Grant No. 23-17-00144.

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