Theoretical Study on Optimum Depth of Ground Improvement for Laterally Loaded Piles Embedded in Clayey Deposit

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Abstract:

Pile foundation is generally used to transfer the vertical load of the superstructure through weak soil to competent bearing stratum. However, in some cases lateral load needs to be transmitted along with axial load, e.g., offshore piles subjected to wind and wave induced load, pile foundation under seismic motion etc. In case of pile embedded in soft to medium stiff clayey deposit, lateral pile deflection may not be in the allowable deflection range under the applied lateral load. Hence, ground improvement may be carried out to increase the lateral pile capacity. Knowledge of the required depth of ground improvement is very much essential in this aspect. In this present study, Beam on Nonlinear Winkler Foundation (BNWF) approach has been used to get a preliminary estimation of optimum depth of ground improvement required to enhance the lateral load carrying capacity of pile. Optimum depth of ground improvement can be defined as the depth from ground surface up to which any increase in soil stiffness will increase the lateral capacity of pile. Further improvement of soil properties beyond this optimum depth will have very little impact on lateral pile capacity. Fourth order governing differential equation of pile deflection has been solved. Element stiffness matrix has been derived and presented in a compact form. A computer code has been written in MATLAB and investigation has been carried out on piles of different slenderness ratios (L/D) of different pile stiffness factors (Ep/Es) to determine the optimum depth of ground improvement.

TANUMAYA; Mr. TANUMAYA MITRA

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