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Modulus of Subsoil Reaction According to Matlock and Reese

This method is applicable for cohesionless soils. The modulus of subsoil reaction is given by equation:

where:

nh

-

modulus of horizontal compressibility [MN/m3]

d

-

pile diameter [m]

z

-

depth of a given section from finished grade [m]

Approximate values of modulus of horizontal compressibility nh  for cohesionless soils:

Soil

- density

nh [MN/m3]

Dry sand and gravel

- loose

- medium dense

- dense

1.8 - 2.2

5.5 - 7.0

15.0 - 18.0

Wet sand and gravel

- loose

- medium dense

- dense

1.0 - 1.4

3.5 - 4.5

9.0 - 12.0

Literature:

Reese, L. C. et. Matlock, H.: Non-Dimensional Solutions for Laterally Loaded Piles with Soil Modulus Assumed Proportional to Depth. University of Texas, Austin, 1956.

Reese, L. C. et. Matlock, H.: Generalized Solutions for Laterally Loaded Piles. Journal of the Soil Mechanics and Foundations Division, ASCE 86, No. 5, 1960, pp. 63 - 91.

Reese, L. C. et. Matlock, H.: Foundation analysis of offshore pile-supported structures. Proceedings of the 5th International Conference, ISSMFE, Paris, Vol. 2, 1961, pp. 91-7