Multidisciplinary site investigations: refraction microtremor surveys

Abstract We present three case studies from recent site investigations that have utilised geophysical data to supplement traditional geotechnical investigations. The refraction microtremor (ReMi) method, which measures the shear-wave velocity of subsurface soil profile, is used enhance our overall understanding conditions. Interpolation closely spaced one-dimensional velocity-depth profiles along linear arrays allows two- or three-dimensional velocity-versus-depth representations be produced, thereby mapping lateral variations and extending characterisations between more expensive spot borehole measurements. ReMi technique provides a non-invasive cost-effective way estimating vertical soil/rock versus depth therefore an effective reconnaissance tool for targeting key areas further, intrusive investigation method. This paper examines contribution assessments can make towards enhancing geological models mitigate risk unforeseen ground Case demonstrate benefits incorporating estimates into These include identifying thickness basalt flows, location buried stream channels, characterising palaeo-topographical features, low may prone liquefaction, assessing within units test pit locations. objective not replace but allow meaningful developed.