Composite Cast-in-Drilled Hole Piles in Frozen Soils, Magadan

摘要

The city of Magadan is located in the warm, discontinuous permafrost zone where the permafrost thickness reaches 12-20 m or more. Composite cast-in-drilled piles are widely used. They are set in boreholes drilled to design depths in strong sub-permafrost unfrozen soil. To provide support for foundations, the piles penetrate the entire permafrost thickness, and the bottom of the hole is filled with compacted debris. The composite piles consist of a supporting debris-soil pillow below, a monolith concrete pole in the middle, and a ferro-concrete pole above. The free space between the hole and the pile walls is filled with mud. This paper considers the basis for the pile method in terms of permafrost engineering, technological procedures, testing, and the load-bearing capacity of composite piles.