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

M. A. Zatsepin, Associate Professor, Candidate of Physical and Mathematical Sciences, zatsepin_ma@pers.spmi.ru
A. P. Gospodarikov, Head of Department, Professor, Doctor of Engineering Sciences

Improvement of safety of underground structures in areas exposed to seismic loading is an urgent task. The solution of this problem, firstly, requires the adequate mathematical models of dynamic fracture of rock mass containing underground structures, and secondly, the effective numerical algorithms on the basis of such models for creating computational programs in various programming environments. At present, as a rule, the well-known software products (Ansys, Abaqus, FLAC 3D, PLAXIS 3D, etc.) are used, although their application due to the specificity and complexity of the research problems not always leads to reliable results. This paper considers the developed mathematical models of seismic impact exerted by drilling and blasting on underground structures (gas and oil pipelines, underground openings). The numerical modeling results allow the following inference: it is reasonable to carry out reliable prediction of the stress state of rock mass containing an underground facility on the basis of interrelated software systems. For example, the FEM-based computation in the Matlab programming environment allows obtaining approximate solutions of problems on interaction of basting-induced seismic waves with rock mass containing an operating gas pipeline. The computation in the Fortran-90 algorithmic language enables obtaining sufficiently accurate numerical solutions for engineering designs. The computation in the JavaScript programming language allows modeling the blasting-induced seismic impact on multilayer rock mass containing an extended horizontal tunnel. The developed approach to assessing the impact of seismic earthquake waves on subway tunnels in the Simulia Abaqus environment provided reliable numerical results on the stress state of subway tunnel lining, which were comparable with the in situ measurements.

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