Numerical Study of Ground Vibration Due to Impact Pile Driving

Geotechnical Engineering Numerical study of ground vibration due to impact pile driving Khoubani and Ahmadi

Proceedings of the Institution of Civil Engineers http://dx.doi.org/10.1680/geng.11.00094 Paper 1100094 Received 09/10/2011 Accepted 04/04/2012 Keywords: dynamics/mathematical modelling/piles & piling

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Numerical study of ground vibration due to impact pile driving
1 j Ali Khoubani MSc 2 j Mohammad Mehdi Ahmadi PhD

Senior Geotechnical Engineer, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

Associate Professor, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

1 j

2 j

Ground vibration due to pile driving is a long-lasting concern associated with the foundation construction industry. It is of great importance to estimate the level of vibration prior to the beginning of pile driving, to avoid structural damage, or disturbance of building occupants. In this study, an axisymmetric finite-element model that utilises an adaptive meshing algorithm has been introduced, using the commercial code Abaqus, to simulate full penetration of the pile from the ground surface to the desired depth by applying successive hammer impacts. The model has been verified by comparing the computed particle velocities with those measured in the field. The results indicate that the peak particle velocity at the ground surface does not occur when the pile toe is on the ground surface; as the pile penetrates into the ground, the particle velocity reaches a maximum value at a critical depth of penetration. Some sensitivity analyses have been performed to evaluate the effect of soil, pile and hammer properties on the level of vibrations. The results show that increase in pile diameter, hammer impact force, soil–pile friction and reduction in soil elastic modulus can increase the peak particle velocity.

Notation
D d E e L Lmin p r VP VR VS Æ â ˜t ¨ ì í r ô ôcrit ö pile

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