PSI - Issue 37

G. Gusev et al. / Procedia Structural Integrity 37 (2022) 425–430 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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stress relaxation in the ground mass. The solution of these tasks determines the stages of design and construction of structures in the undermined territories. Also, the solution of these tasks determines the pattern of monitoring the technical condition of structures that are already in operation. Unfortunately, the issues of modeling the behavior of various structures in the mine construction zone have been little studied. Along with this, there are a large number of articles that are devoted directly to the study and prediction of the development of deformations of the soil surface in places of potash salt extraction [1-10]. The task of developing a direction in which the influence of deformations of the earth's surface on construction objects is studied is particularly relevant. There are point objects and there are large arrays of structures such as residential areas and entire cities. The processes of deformation behavior of such types of objects differ significantly, which complicates forecasting. There are great difficulties with the analysis of the stress-strain state of objects that are made of different structural materials and built using different technologies. It is worth focusing on the fact that modern regulatory documents in this field of knowledge are significantly outdated [11]. They do not take into account the latest technologies of construction and production of mining workings. These regulatory documents are based on research that was carried out in the last century. The methods of predicting deformations used in these documents do not meet modern requirements. Thus, there is a huge list of specific tasks, united by a common direction. This direction is the safe construction and operation of various structures in the undermined territories. 2. Modeling of the stress-strain state of objects in the mine construction zone Based on field studies [12], it is assumed that a uniaxial deformed state occurs in the surface layer of the soil massif in the plane of the layer. The thickness of the layer is comparable to the depth of the foundation structures. This condition is caused by mining operations in the underlying layers of the soil massif. It is also assumed that the deformations in the soil layer are uniform and homogeneous in the first approximation. The component of this state can be accurately recorded by geophysical measuring instruments [3,5,10,12]. This state can always be represented as a field of significant deformations in the plane of the Earth's surface. The construction is based on the described layer of the soil mass before the deformation process begins. The influence of deformation of the soil mass on the load bearing elements of the structure is studied (Fig.1).

Fig. 1. (a) The scheme of deformation of the earth's surface in the area of potash salt production; (b) the finite element model of the stress-strain state of one of the buildings located in the zone of development of horizontal deformations (expansions) of the earth's surface.

The work determines the level of deformations in the soil layer, which corresponds to the critical condition of the structure. Obviously, these questions are parametric in nature. They depend on: the type of structure and its height, the type of foundation structures, the type of materials, the type of construction technology, the technical condition of the structure, etc. The answers to these questions are formulated in the space of the described parameters. The answers are presented on the basis of numerical solutions of boundary value problems on the interaction of the structure with the soil mass. The simulation was carried out using the ANSYS software package. The simulation results contain information about the distribution of the parameters of the stress-strain state of the structure depending on the deformation of the zone in which the mine construction is carried out (Fig.2). The limiting parameters of the deformation state of the entire system "building - foundation - soil array" are determined.