Mechanical safety of underground linear and point water-carrying structures under external influences

Abstract


The purpose of the study is to solve the problem of ensuring the mechanical safety of underground wastewater disposal facilities and increasing the reliability of their operation, taking into account the current technical condition and the range of natural and man-made external and internal influences. Based on the analysis of the joint work of linear and point underground structures in a ground mass with a combination of influences of various nature, to identify factors influencing the risk of reducing their mechanical safety. When systematically examining the structure as a whole, its interfaces or part of the structures, to identify defects and conditions of their manifestation, which may lead to destruction or loss of stability of the structure as a whole, its interfaces or part of the structures. According to the level of stress-strain state of local interface zones and the boundaries of the distribution of exceedances of maximum permissible values over the structure and the enclosing soil massif, design scenarios and situations are identified that correspond to a violation of the structural safety of the structure as a whole in one case, and in the other – the structural safety of a part of the structure (node) of the structure. The causes and mechanism of defects in coupled structures of tunnels and mines operating under conditions of non-stationary impacts during wastewater transportation have been identified. A methodology and algorithm for conducting joint geotechnical and design calculations are proposed that allow modeling the processes of interaction between the tunnel shell and the ground environment and predicting the parameters of their joint work, ensuring the operation of the structure and its parts within the boundaries of mechanical safety. Based on the results of interaction modeling, the limiting levels of the stress-strain state were determined, both for parts of structures and local interface zones responsible, respectively, for structural and structural safety, and for the structure as a whole - its mechanical safety. Geotechnical protection methods and a monitoring system for ensuring the mechanical safety of spatially and geometrically heterogeneous underground wastewater disposal facilities are proposed.

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About the authors

N. A Perminov

Saint Petersburg State University of Railways of Emperor Alexander I

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