Effect of Pile Arrangements on the Dynamic Coupled Response of Pile Groups
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ORIGINAL PAPER
Effect of Pile Arrangements on the Dynamic Coupled Response of Pile Groups Shiva Shankar Choudhary . Sanjit Biswas . Bappaditya Manna
Received: 19 April 2019 / Accepted: 13 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract This paper presents both experimental and analytical investigation to monitor the effect of dynamic pile-soil-pile interaction on the nonlinear coupled response of a 6-pile group placing in different arrangements of piles under rotating machine induced vibrations. Another aspect of the present study is the theoretical prediction of parameters responsible for the nonlinear coupled response of the pile foundation. The pile groups comprised of hollow steel piles with an outer diameter of 0.114 m and a length of 3 m. Coupled vibration field tests are performed on the pile groups laid in two different set of pile arrangements (2 3 and 3 2 pile groups) to obtain the dynamic horizontal and rocking responses of the pile groups under different eccentric moments. For theoretical study, the continuum approach with superposition method is used to determine the nonlinear dynamic responses of the pile groups. The analytical frequencyS. S. Choudhary (&) Department of Civil Engineering, National Institute of Technology Patna, Patna 800005, India e-mail: [email protected]; [email protected] S. Biswas Department of Civil Engineering, National Institute of Technology Warangal, Warangal 506004, India e-mail: [email protected]; [email protected] B. Manna Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India e-mail: [email protected]
amplitude responses for both types of vibrating displacements are compared with the dynamic field test results and the variations of the influencing parameters for the nonlinear dynamic response of the soil-pile system are predicted for coupled vibration. For 3 9 2 pile group, the resonant frequencies are found lower and resonant amplitudes are found higher than the values of the 2 9 3 pile group for all eccentric moments. It is also observed that the stiffness and damping of the 3 9 2 pile group shows lesser values than the 2 9 3 pile group even if the input analytical parameters are same for both the pile groups. From the results, it can be concluded that the effect of dynamic pile-soil-pile interaction is more pronounced for 3 9 2 pile group as compared to the 2 9 3 pile group. Keywords Pile group Coupled vibration test Nonlinear dynamic response Pile-soil-pile interaction Continuum approach analysis Boundary zone parameters
1 Introduction In recent years, heavy machines such as turbines, generators, pumps etc. are extensively used in different industries to increase the quality and speed of production. These machineries produce high magnitude of dynamic loads on the foundations. Most often piles are provided in groups with different spacing and
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arrangements to support these types of foundation. One of the basic complicat
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