Mechanisms of the process of underground pipelines interaction with soil

At present, worldwide, underground pipelines are strategic objects of life support for the population and industry (gas and oil pipelines, water lines, etc.). Therefore, ensuring their strength and stability, guaranteeing their uninterrupted operation is an urgent problem of our time. To solve this problem, first, it is necessary to have a reliable law of interaction of underground pipelines with soil under dynamic (including seismic) impacts. The essence of this law of interaction, the mechanism of the process of interaction has not yet been studied. With the methods of the theory of strains and stresses of the mechanics of continuous deformable media, it is shown that the law of longitudinal interaction of an underground pipeline with soil is, in fact, the law of shear strain of the contact layer of soil on the outer surface of an underground pipeline of a certain thickness. It was found that all the parameters of the interaction law are determined using the shear strength characteristics of soil. When the underground pipeline interacts with soil, the interaction process consists of two stages: the prelimit stage, where elastic, visco-elastic models of shear strain of the contact layer of soil are fulfilled, and the limit stage, where the interaction process obeys the Coulomb friction law. Elastic, visco-elastic laws of interaction are considered together with the Coulomb law and their advantages and disadvantages are determined on the basis of a numerical parametric analysis of the law equations. It was found that the interaction law based on Eyring's model and Coulomb's law is the most adequate to the known experimental results; it takes into account all the factors observed in experiments. It is recommended to use this law of interaction when solving applied problems of seismic resistance of underground main pipelines.

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