Thermal Interaction of the Underground Gas Pipeline with Permafrost on the Bovanenkovo - Ukhta Pipeline Section

摘要

The gas pipeline route passes through an area with complex geocryological conditions. There are zones of continuous, isl-and-like and discontinuous permafrost here. The investigated section of the Bovanenkovo - Ukhta un-derground gas pipeline route is located in the region of mostly continuous permafrost distribution of the Bolshezemelskaya Tundra (the North of the European Russia). Here, the perma-frost thickness is 300 m, the temperatures at the depth of zero annual amplitudes vary from -1 to -3°C [Geocryology...1988]. The seasonal thawing depth of the grounds is 0.5 - 1.6 m on this section. The upper part of the section consists of the Quaternary deposits of small thickness, predominantly of clayey silt and sandy silt containing a large amount of boulders and pebble (15-20%), and a peat layer that beds from the surface and is 10 - 40 cm thick.