Abstract
The paper presents the results of the author's research aimed at finding new methods of vibrodynamic sealing of sandy soils foundation by using the energy of water flow. The data of water flow parameters providing the given speed of its movement without the significant carryover of sand particles based on the theoretical studies, as well as the laboratory studies of sandy soil dumping into a water flow (with an average horizontal velocity of about 10-15 cm/s) on a specially designed hydraulic tray are described in the paper.
Highlights
The "island type" oil platforms are made in the form of an inverted cup and usually have a diameter exceeding 100 m, with an opening filled with inwash sand
According to the project variant of an oil platform of this type developed in Russia, performed in the form of a multi-faceted metal shell, the explosive method of compaction was defined as the main one
Taking into account the percentage of the particles carryover determined by the results of sand particle size distribution before and after the experiment (Fig. 1) that does not exceed 2.5-3 % for the particle size less than 0.315 mm, we have the values of packing density of sandy soil foundation into the water flow as ρsk = 1,58 - 1,63 g/cm[3]
Summary
The "island type" oil platforms are made in the form of an inverted cup and usually have a diameter exceeding 100 m, with an opening filled with inwash sand.The analysis of the condition of the water-saturated sandy soils of the foundations and structures made by free inwashing and underwater dumping in the absence of current shows that regardless of the granulometric composition, they are settled with a skeleton density of a fluffy consistency and require compaction, especially in earthquake zones.Today, vibrodynamic soil compression techniques for structures and foundations are well-known and used worldwide [1-13].To compact the core sand of the "island type" ice-resistant stationary platform at the offshore oil and gas condensate field Chaivo-1 (Ice-resistant stationary platform (ISP) “Chaivo-1”), the author proposed an explosive method for compacting the sand core of the oil platform. The "island type" oil platforms are made in the form of an inverted cup and usually have a diameter exceeding 100 m, with an opening filled with inwash sand. According to the project variant of an oil platform of this type developed in Russia, performed in the form of a multi-faceted metal shell, the explosive method of compaction was defined as the main one. In view of the very tight deadlines of platform construction during the summer period in the Northern climatic conditions, in particular, on Sakhalin Island (Russia), the author conducted special research studies aimed at reducing the construction time by combining the operations of inwashing and soil compaction.
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