Negative Skin Friction Development on Single Pile and Pile Group Embedded in Soft Clay

Document Type : Research Studies

Authors

1 Associate Professor at Structural Engineering Department, Faculty of Engineering, Mansoura University, Egypt.

2 Teaching Assistant at The Department of Civil Engineering Mansoura Collage Academy, Mansoura, Egypt

Abstract

Determination of negative skin friction force and The neutral plan is one of the challenges which face geotechnical engineers. Unfortunately, negative skin friction decreases the bearing capacity of pile because of the extra compressive force on the pile. In this research, a 3D FE models were used to investigate the behavior of single pile and pile group in soft soil for surcharge load as embankment fill. And what are the differences that will happen on the behavior of single and pile group. For embankment fill load, the maximum group effect is the center pile and the corner pile observed the minimum group effect. The depth of the neutral plan for center pile is less than observed in the corner pile. A simple parametric study has been done to study the group effect. Spacing to diameter ratio (S/D) in the pile group had changed in a view solution to develop the pile group effect. Increasing the ratio of spacing to diameter keep the group behaves as a single pile in large S/D. Besides, there is maximum effective spacing to diameter ratio taken into consideration, its behavior as a single pile behavior

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