To models for assessing the induced stress of the geological massif in seismically dangerous territories
UDC
539.422.3DOI:
https://doi.org/10.31429/vestnik-17-2-42-48Abstract
It is known that the most significant man-made earthquakes are induced by the long-term production of hydrocarbons, existing technologies and features of the organization and implementation of the production process.
Their peculiarity consists in increasing the maximum magnitude of recorded seismic events after some time after the start of production activity.
In this work, we propose a model for studying the dynamics of the natural tension of the geological massif under the direct impact of the production infrastructure. It is shown that the intensity of the process depends on the strength and spatial distribution of anthropogenic impact, geotechnical features of the territories.
A distributed load is applied to the surface of the structure under study, simulating the harmonic signal generated by the surface objects of the production infrastructure. Internal production wells forming a cylindrical surface can perform distributed horizontal and vertical vibrations.
We conducted a study of the amplitude-frequency characteristics, solved the problem of determining the contact stresses arising in the system.
The objects of the surface production infrastructure are modeled by a stamp on which a vertical harmonic load is applied. The stresses under the stamp created by buried inclusions are determined. The nature of the stress distribution under the stamp is determined by the totality of the system parameters: the size of the sources, the type of load distribution on the inclusions, and the oscillation frequency.
The results we obtained are in good agreement with the conclusions made on the basis of long-term observations of the seismicity of territories with intensive exploitation of hydrocarbon deposits, according to which production activity has only a slight change in the background seismic tension.
Keywords:
earthquake hazardous territory, induced tension, technogenic impact, surface load, internal load, stress-strain stateAcknowledgement
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