Сalculation of the bearing capacity of a pile for a pile field

Hello dear forum participants. I am very interested in help in solving such a non-standard problem:

Сalculation of the bearing capacity of a pile for a pile field (for example, 4 piles with a square arrangement) small for permafrost soil, taking into account the probability of its seasonal thawing (with the possibility of thermal stabilization of the near-pile zone).

The following pile parameters are known:

Diameter - 219 mm (wall thickness 11 mm)

Immersion depth in the ground - 25 m

Load on one pile up to 50 kN

Corrosion activity on carbon steel - moderately aggressive

On concrete structures - non-aggressive

Arrangement of piles in a square with a distance between them 3000 mm

The following soil parameters are known:

values ​​of natural moisture and density of wet soil 0.47 and 1.74 g / cm3

porosity coefficient - 1.288

specific adhesion value 9 kPa

angle of internal friction 5.7 °

Compression modulus 0.4 MPa

Guideline value of adhesion according to triaxial tests 14 kPa

Plasticity 0.21

Frozen ground temperature minus 0.1 minus 3 °С

Frozen soils are in a frozen state

The temperature of thawed soils reaches a maximum value of 0.5 °С

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