EVENT TYPE: International lecture
DATE: March 30, 2018
ORGANIZER: The Japanese Geotechnical Society, International Affairs Department
VENUE: JGS head office (4-38-2 Sengoku, Bunkyo-ku, Tokyo, 112-0011, Japan)
“Active Vibration Screening in Soil with Intermittent Geofoam”
Dr. Priyanka Ghosh
Dept. of Civil Engineering
Indian Institute of Technology Kanpur
Please apply by e-mail to JGS International Affairs Department (email@example.com) and provide your name, JGS membership number, affiliation and contact address.
In the present talk, an attempt is made to explore the application of intermittent expanded polystyrene (EPS) geofoam as a vibration screening material. A new technique is proposed to obtain more effective screening efficiency against the ground vibration using intermittent EPS geofoam. The numerical analysis is performed by employing two-dimensional finite element method under dynamic condition. Vertically oscillated strip and circular embedded foundations are considered as two different types of vibration source. The present analysis considers the foundation bed as linear as well as non-linear elastic, isotropic, homogeneous and non-homogeneous (layered) soil deposit. In presence of ground vibration, the vertical displacements at different locations (pick-up points) along the ground surface are captured to determine the amplitude reduction factor, which helps to assess the efficiency of vibration screening technique. A parametric study is performed based on trench geometry and filling material, layering effect of soil deposit and frequency of source. The results are presented in dimensionless form to address the design guidelines for vibration screening technique using intermittent EPS geofoam.