№84-16
The use of multilayer structures to increase the protective properties of dual-purpose underground structures
L. Shaydetska1, https://orcid.org/0000-0002-6593-0255
N. Zuevska1, https://orcid.org/0000-0002-1716-1447
D. Darmostuk1, https://orcid.org/0009-0002-3714-9821
R. Semchuk1 https://orcid.org/0009-0007-1336-6246
1National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Coll.res.pap.nat.min.univ. 2026, 84:208–217
Full text (PDF)
https://doi.org/10.33271/crpnmu/84.208
ABSTRACT
Purpose. Substantiation and development of a comprehensive approach to optimizing the protective properties of structures through the implementation of multilayer systems.
The methods. The study is based on the finite element method, implemented using the ANSYS Explicit Dynamics software package, which allows for the modeling of high-speed nonlinear deformation processes. The methodology accounts for soil pore compaction effects, nonlinear compression, and plastic deformation of materials. The use of consistent material models enables the accurate replication of shock wave front propagation, its reflection from interface surfaces, and its subsequent interaction with the structural elements of the facility.
Findings. Numerical experiments allowed for a quantitative assessment of the effectiveness of additional protective layers. It was established that the introduction of an intermediate reinforced concrete layer promotes the redistribution of explosion energy and a significant reduction in the amplitude of tensile stresses within the internal structural elements and the surrounding soil. The obtained data confirm that the multilayer structure acts as a damping barrier, reducing stress concentrations in the most vulnerable zones of the underground structure and preventing its progressive collapse.
The originality. For the first time, complex dependencies describing the influence of the geometric configuration and physico-mechanical characteristics of the multilayer system's components on the overall stability of the structure have been obtained. The understanding of energy absorption mechanisms in the "reinforced concrete structure – porous soil mass" system under ultra-fast loading conditions has been deepened. The modeling approaches have been improved by accounting for wave interaction effects in heterogeneous media, specifically energy attenuation due to pore air compression and multiple pulse reflections at material boundaries with different acoustic impedances.
Practical implementation. The research results have direct application in the engineering field, particularly for the design of new and the modernization of existing civil defense facilities, transport tunnels, and critical infrastructure. The proposed calculation models and established patterns provide a justified basis for selecting the thickness and materials of protective screens, ensuring increased personnel safety and the preservation of material assets. The findings can be integrated into industry standards and methodological recommendations for assessing the stability of underground objects under dynamic impacts.
Keywords: underground structures, blast loading, multilayer structure, reinforced concrete, porous soil, stress-strain state, ANSYS Explicit Dynamics, dynamic stability, shock wave, civil protection.
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date of first submission of the article to the publication – 01/12/2026
date of acceptance of the article for publication after review – 02/14/2026
date of publication – 03/30/2026