CALIBRATION OF NON-LINEAR TO LINEAR SOIL MODULUS ON PILE FOUNDATION DUE TO LATERAL LOADING

Abstract

Pile foundation modeling is a common practice to evaluate soil deformation due to vertical and lateral loading. This approach is particularly crucial for geotechnical structures with significant lateral loading, including retaining walls, skyscrapers, transmission towers, and offshore structures. One prevalent assumption in pile foundation modeling involved linear modulus of elasticity of the soil with increased depth. This assumption has traditionally been deemed valid for the response of pile foundation to the natural conditions encountered in the field. However, the soil is not an elastic material, which means the assumption of using linear modulus of elasticity in foundation modeling must be evaluated further. The deflection of the pile foundation is analyzed using linear, layered, and non-linear modulus of elasticity. The Reese Matlock model was adopted to model linear elastic modulus, while the Winkler model was used for layered and non-linear elastic modulus. Non-linear modulus of elasticity was obtained from three different sites, namely Citarum, Dompak, and Batang. The results showed a difference in the average comparison of the average Reese Matlock and Winkler models at the Citarum Project by 2.54%, 4.35%, and 5.08%. At the Dompak Project, the differences are around 2.57%, 4.37%, and 6.63%, and at the Batang Project, the differences are roughly 2.28%, 3.07%, and 5.58%. The analysis showed that the surface deflection was determined by non-linear elastic modulus analysis with an excess of about 10% to 14% at the first 10% of the pile length.