Опасность пучения при эксплуатации магистральных трубопроводов

Васильчук, А.К.

Автор: Васильчук А.К.
Сборник: Материалы Международной научно-практической Конференции по инженерному мерзлотоведению, посвященной ХХ-летию ОО НПО «Фундаментстройаркос»
Год издания: 2011
Место издания: Сити-Пресс Тюмень
Первая страница: 269
Последняя страница: 279
Аннотация: operation problems of linear objects in palsa landscapes in the southern permafrost areas are considerably determined by lack of investigations of frozen ground massives at the stage of engineering surveys. These problems are usually associated with inaccurate estimation of the southern boundary of the permafrost areas in normative documents. Local occurrence of frozen palsa landscapes is usually detected only at prospecting of extended linear objects in sporadic permafrost areas. The paper shows that the southern limit of the palsa areal is more preferable to consider as the southern boundary of the permafrost area for construction of extended objects. The main danger for extended linear objects is associated with high dynamism of palsa landscapes. Palsa landscapes intensively change under influence of global and local environmental changes, linear objects themselves, construction processes and other anthropogenic factors. The pipeline operation risk in sporadic permafrost palsa landscapes is associated with wide range of vertical displacements under influence of seasonal freezing and thawing in the contact zones between palsas and the thawed areas that surround them. The range of seasonal vertical displacements of pipelines in palsa landscapes reaches 1–2 m. Loss of the bearing capacity of frozen soils in palsa landscapes leads to uneven subsidences and serious changes of local curvature radiuses of pipelines. The sizes and configurations of palsa landscape elements should be taken into account, and passage of pipelines across the central parts of the most icy and potentially highly subsiding permafrost areas should be excluded as far as possible. Additional geotechnical and geophysical surveys should be carried out after construction of pipelines but before the beginning of their operation to get more accurate and reasonable forecasts and estimations of needs for seasonal cooling devices. To assess development of heaving processes after construction of linear objects during hydrometeorological and hydrogeological engineering surveys it is necessary to regionalize the object route by the factors determining the intensity of heaving, in particular by existence and duration of the period of slow decline of the soil temperature.
Добавил в систему: Васильчук Алла Константиновна

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Опасность пучения при эксплуатации магистральных трубопроводовстатья

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