Measuring p and s wave velocities of unsaturated soils
Date of Issue2011
School of Civil and Environmental Engineering
The propagation of Primary (P) and Secondary (S) waves has garnered increasing interest due to its applicability in areas such as geo-prospecting, site investigation and the determination of geo-material properties like degree of saturation (Sr) and stiffness. In this project, the effect of frequency on P and S wave velocities and the relationship of P wave velocity with degree of saturation are investigated. This report consists of both experimental and modeling aspects.The experimental aspect attempts to understand the propagation of P and S waves. The effect of frequency on the P wave velocity (Vp) is important because while many laboratory experiments and in-situ seismic survey have been conducted to measure them, the data from different sources should strictly not be used interchangeably as different P waves may be measured at different frequencies. Experiments were conducted on sand to determine the effects of frequency on P wave velocity. It was found that there were two P waves (slow and fast) propagating through the specimen at any one time.
Final Year Project (FYP)
Nanyang Technological University