Shvets and Nazha (2000) investigated the influence exerted by anisotropy of the
deformation properties of soil foundation beds on the elastic characteristics used in dynamic analyses of
machine-bearing foundations. They suggested that correction factors dependent on the degree of anisotropy of
the soil should be used in the analyses. DeMerchant et al. (2002) performed an experimental study to investigate
the beneficial effect of geogrid on subgrade modulus of lightweight aggregate beds. Moghaddas Tafreshi &
Khalaj (2008) performed an experimental study to investigate the beneficial effect of geogrid on settlement of
soil surface, subjected to repeated loads to simulate the vehicle loading. They reported that settlement of soil
surface can be reduced significantly by using geogrid reinforcement.
In designing a machine foundation the coefficient of elastic uniform compression of soil (Cu) is the most
important parameter to be determining which can calculate by a cyclic-foundation-load test