PIPE-SOIL INTERACTION MODELS OF PIPELINE RESPONSE TO  ACTIVE FAULTS AND BLOCKSLIDES ABRUPT DISPLACEMENTS

Temis, M.; Fomenko, I.; Strom, A.

Авторы: Temis M., Fomenko Igor, Strom Alexander
Сборник: Proceedings of the 17th World Conference on Earthquake Engineering
Год издания: 2020
Место издания: Sendai, Japan
Номер статьи: 2e-0022
Аннотация: The similarity and the discrepancy of the impacts on pipeline caused by surface faulting and by activation of seismically triggered blockslides are analyzed. Both hazardous phenomena could produce significant (multi-meter) offsets concentrated within narrow zones that could rupture pipeline crossed by an active fault or by a blockslide boundary. Usually such sites should be avoided. However, trunk pipelines often have to cross them and it is critically important to ensure their safety either by special engineering measures or by rerouting. Similarity of the effects that both hazardous phenomena exert on the structure, up to some offset values (maximal single-event surface ruptures could reach 10-15 m; similar offsets are often observed at the blockslide boundaries), has been demonstrated that allows application of the similar pipe-soil interaction models for justification of the pipeline strength. Mechanisms of the pipe-soil interaction for displacements with different kinematics (normal, reverse, strike-slip) and different values (from 0.1 to 5 meters) were analyzed by the numerical modeling. Offsets with similar kinematics can be observed at the proximal, frontal and lateral boundaries of blockslides. To characterize pipe-soil interaction caused by the significant displacement of a pipe buried in a trench several numerical simulations were developed. We compared characteristics of pipe-soil interaction derived by the numerical simulation with those obtained by the traditional pipe-soil interaction models used in the engineering practice, and analyzed applicability of the traditional engineering models for pipeline displacements exceeding 0.5 m. Effect of the use of different soil models on the stress-strain state of pipelines has been estimated by examples of the Sakhalin pipelines prone both to active faulting and to landslides. Pipelines with different diameters, different trench shapes and different fault (landslide) kinematics were analyzed. These simulations by beam finite elements allow characterizing interaction of the pipeline and of the surrounding backfill when pipe moves laterally, downward or upward.
Добавил в систему: Фоменко Игорь Константинович

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PIPE-SOIL INTERACTION MODELS OF PIPELINE RESPONSE TO ACTIVE FAULTS AND BLOCKSLIDES ABRUPT DISPLACEMENTSстатья

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