Assessment of modulus of subgrade reaction of sand-sensitivity analysis

摘要

The determination of modulus of subgrade reaction #kappa# by static equilibrium method suffers considerable inaccuracy, which can be associated with two problems. The first is attributed to an inadequacy of physical model used in simulation of soilresponse as the Winkler foundation. The second is connected with the fact that #kappa# depends on width of the pile. In this paper, the static equilibrium method is used for initial assessment of #kappa# for frictional soil. The models of piles of variable width embedded in homogeneous soil are laterally loaded till failure in the laboratory. The force--displacement performance curves consist of linear part combined with considerably long nonlinear part. The investigations of their full range of variability allow for determination of secant values of #kappa#. The rectification process for convergence of laboratory outcomes with numerical simulation is performed in the framework of sensitivity theory. The results show strong dependence of #kappa# on thewidth of the models of laterally loaded piles.