Event Detail

Event Type: 
Applied Mathematics and Computation Seminar
Date/Time: 
Friday, May 17, 2019 - 12:00 to 13:00

Speaker Info

Institution: 
School of Civil and Construction Engineering
Abstract: 

Soil instability from tsunami hazards causes substantial damage to coastal infrastructure (e.g., the damage caused by the 2011 Great East Japan Tsunami). Tsunamis are unpredictable, thus it is difficult to obtain field-scale measurements. Simulating tsunamis in a laboratory setting is therefore important to further understanding of soil instability induced by tsunami inundation processes. Such laboratory simulations are difficult because the scale of tsunami inundation processes is very large, hence dynamic similitude cannot be achieved for small-scale models. The ability to control the body force in a centrifuge environment considerably reduces the mismatch in dynamic similitude. A novel centrifuge apparatus specifically designed for exploring the physics of soil response to tsunami-like loading was designed and constructed specifically for use in the 9.1m geotechnical centrifuge at the University of California, Davis. Tsunami flooding in the apparatus is created by lifting a gate and releasing water from a reservoir (i.e. breaking of a dam), and tsunami drawdown is achieved by lifting another gate to drain the flooded water. Several experiments were conducted and the results yield, for the first time, quantitative measurements of pore-water-pressure propagation in soil under a swiftly moving water-surge front, and the development of pore-water-pressure gradients during the drawdown processes. In this presentation, preliminary results of pressure transducer analysis and digital image processing are presented.