Introduction and development of soil thermal stabilization technologies at the objects of oil pumping station-2 (OPS-2) of "Kuyumba - Tayshet" trunk oil pipeline

• Main Authors: Sapsay Aleksey Nikolaevich, Pavlov Vyacheslav Vladimirovich, Kaurkin Vasiliy Dmitrievich, Korgin Andrey Valentinovich
• Format: Article in Journal/Newspaper
• Language: English; Russian
• Published: Moscow State University of Civil Engineering (MGSU) 2014
• Subjects: equivalent temperature; ventilated underground area; major pipeline; "Kuyumba-Tayshet"; thermotechnical calculation; thermal stabilizer of soils; bearing capacity; pile foundations; Architecture; NA1-9428; Construction industry; HD9715-9717.5; permafrost
• Online Access: https://doaj.org/article/66a7874b1cb74b59886d4ee3f8ef5633

The article deals with the questions of designing the foundations for the Oil Pumping Station-2 site of "Kuyumba - Tayshet" trunk oil pipeline. The problems of choice and grounds for technical solutions are considered basing on the results of complex thermotechnical calculations. The construction territory of OPS-2 site of "Kuyumba - Tayshet" trunk oil pipeline is characterized by complex engineering and geocryological conditions: 1) presence of permafrost soil on 80 % of the site area; 2) absence of sufficiently widespread rocky soils under designed buildings and constructions; 3) transition of loamy grounds into yield during thawing. The buildings and facilities are designed on the basis of pile foundation type with high rigid foundation grill. The piles’ diameter is 325 mm and 426 mm, the total length of piles is 9-12 m. The full designed vertical loading, transferred to the pile, is ranging from 10.6 to 50.4 tf. According to the results of the calculations, in order to provide the necessary bearing capacity of piles, securing the perception of transmitted designed loadings, the equivalent temperature of the soil along the side surface of piles ( e) should not be higher than -0,5 °C. Taking into account that the soil temperatures on the projected site mainly range from -0.1 to -0.3 °C, in order to lower their temperatures to the calculated values ventilated underground areas are arranged under the buildings and facilities and seasonally active cooling devices (soil thermal stabilizers) are installed. Assembly technique and construction of ventilated underground areas with application of soil thermal stabilizers were developed earlier while designing the pipeline system "Zapolyarye - Oil Pumping Station Purpe". For confirmation of the accepted decisions forecasting thermotechnical calculations were performed with the use of a special computer program TermoStab 67-87, which allows simulating the changes of temperature regimes of the permafrost in the process of construction and operation of the facility. As a ...