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The paper presents the results of the study of the photogrammetric models quality depending on the photogrammetric survey. The presented data have been obtained by the Xiaomi Mi Home Security Camera 360. We examined the texture of the captured object and the general geometric parameters of the created photographing basis as the experimental variable. As a result, the paper contains general recommendations for the cameras optimal location for photogrammetric surveying in low light and space limits. The main author’s idea of the improvement of the photogrammetric models quality is projecting a temporary artificial texture on the subject of surveying.

The article presents the results of mathematical modelling of geomechanical processes that occur during the construction of an escalator tunnel using EPB TBM at the «Mining Institute» station in Saint Petersburg. A numerical model was built using the finite element method implemented in «Plaxis 3D» software. Hardening soil model was used for modelling of soil massif. The analysis of the distribution of displacements and deformations in the main cross-sections of the displacement trough is performed. Issues of assessing the harmful effects of underground construction on undermined buildings and structures are considered. Based on the research, we can conclude that the construction of a tunnel is safe for undermined buildings with strict tunnelling technologies compliance.

The article presents a comparative analysis of the results of mathematical modeling of horizontal tunneling in the Plaxis 3D software package. Two main ways of modeling the tunnel lining were considered: models based on volumetric elements and using the Plate tool. An analysis was made of the distribution of displacements and deformations on the surface: subsidence, inclinations, curvature, horizontal deformations. Comparison of the maximum strain values showed an insignificant deviation (approximately 5%), which proved the applicability of the two models. For further work, a method using the Plate tool could be recommended as being more suitable in the case of complex models with a large number of intersections.

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