Geophysical Site Investigation Methods
Definition - What does Geophysical Site Investigation Methods mean?
Geophysical site investigation methods are used to study the physical properties of earth materials. It involves simple methods used on the surface to learn about the subsurface. Since earth is comprised of different materials with different physical properties it is important for owners and contractors undertaking trenchless construction projects to know what they will encounter beneath the earth's surface as they bore underground.
It is vital because it helps them along with the geotechnical and site investigation reports to make the right decision regarding the method most suitable for the subsurface soil condition, consequently saving time and cost.
Trenchlesspedia explains Geophysical Site Investigation Methods
Geophysical site investigation methods are simple, quick and physical in nature, making them environmentally friendly and cheap. The same field data can be used to draw different inferences. Some of the geophysical methods commonly used are seismic refraction and reflection, crosshole testing, downhole testing, spectral analysis of surface waves (SASW), ground penetrating radar (GPR), electromagnetic wave measurement and induced polarization.
Geophysical investigations can be used to select borehole locations and can provide reliable information of the subsurface condition between existing boreholes. The equipment can be easily deployed in forest areas, contaminated locations, under bridges and power lines, marshes and other areas where other test methods cannot be employed.