Study of influence of the deep pit construction on soil mass in flat and spatial formulation

The paper presents the study of the impact of deep pit of different geometries on the stress-strain state of the enclosing soil body. This topic is relevant in the construction of deep pits in soft soils in restrained urban conditions. Even under the protection of a slurry wall and strutting, that is a rigid structure, ultimate deformations of soil body can occur, which can lead to damage of the surrounding buildings, often of historical importance. Numerical modeling performed by finite element method in Plaxis software package revealed that in most cases the prediction of the stress-strain state of the soil body in the vicinity of such structures in 2D or plane setting does not give a reliable result. It is necessary to perform spatial numerical modeling. For practical purposes and preliminary calculations, authors proposed dependencies that determine the values of conversion factors from 2D to 3D setting of the problem for any spatial location of the adjacent building on the basis of a multivariate study. Numerical calculations give satisfactory convergence with in-situ data and can be used to predict the stress-strain state of the soil body in the vicinity of deep pit.

Demenkov P. A., Komolov V. V. Study of influence of the deep pit construction on soil mass in flat and spatial formulation. MIAB. Mining Inf. Anal. Bull. 2023;(6):97-110. [In Russ]. DOI: 10.25018/0236_1493_2023_6_0_97.

P.A. Demenkov¹, Dr. Sci. (Eng.), Assistant Professor, Dean of Construction Faculty, e-mail: demenkov_pa@pers.spmi.ru, ORCID ID: 0000-0003-1599-8080,
V.V. Komolov¹, Assistant of Chair, e-mail: Komolov_VV@pers.spmi.ru, ORCID ID: 0000-0002-5468-6760,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

V.V. Komolov, e-mail: Komolov_VV@pers.spmi.ru.

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