Abstract
In this study, peak particle velocity (PPV) values for driving three piles with diameters of 40 cm, 50 cm, and 70 cm in a clayey soil through the impact piling method are investigated by an experimental study and a numerical simulation. An experimental study is carried out on a scale of 1:20 of the operation. Numerical simulation is performed by using an axisymmetric model in PLAXIS 2D finite element software. Properties of the soil and the piles used in the experimental study are obtained from geotechnical tests and employed in the numerical simulation. The model has been verified by comparing the acquired PPV values with those measured in the experimental study. The results show a good agreement between the computed values and the experimental data. Moreover, measured peak particle velocities in the experimental study indicate that an increase in the diameter of the pile can increase the level of ground vibration. Some sensitivity analyses have been performed by numerical modeling to determine the effect of soil and pile properties on the changes of PPV. Also, increase in friction angle of the soil and pile diameter and reduction in elastic modulus of soil will increase the level of ground vibration. The results indicate that the amount of PPV at a distance of 100 cm is about 10.33% of the amount of PPV at a distance of 25 cm from the impact site to the pile with a diameter of 3.5 cm. In addition, this amount of reduction for pile with a diameter of 2.5 and 2 cm is equal to 8.31% and 12.77%, respectively.
Highlights
In most of the construction operations where an adequate ground support is not available, pile diving for construction of foundations is required
Estimation of level of ground vibration due to impact pile driving in a clayey soil has been done by implementation of an experimental study and numerical simulation by means of finite element PLAXIS software
The results of this study are summarized as below: The proximity of the results acquired from the experimental study and numerical modelling indicates that the Mohr-Coulomb model in PLAXIS software can be used in dynamic analysis of pile driving
Summary
In most of the construction operations where an adequate ground support is not available, pile diving for construction of foundations is required. Due to an increasing development in numerical analysis of geotechnical problems, use of geotechnical software's to investigate the propagation and attenuation of ground vibrations caused by pile driving has become more popular In this regard, Masoumi et al (2007) developed a numerical model using the Finite Element-Boundary Element model by ABAQUS software to predict the inductive ground vibrations from installation of piles through vibratory and impact pile driving methods. Rezaei et al (2016) investigated the changes in the values of PPV at radial and vertical distances from impact pile driving operation by modeling the continuous penetration of the pile to the desired depth through ABAQUS software. They investigated the effects of soil properties and pile geometry on the level of vibrations. Sensitivity analysis is performed to determine the effects of pile geometry and soil properties on the level of ground vibration
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