Modulus of Subsoil Reaction According to Matlock and Reese
This method is applicable for cohesionless soils. The modulus of the subsoil reaction is given by the 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