Cavola Experiment: Borehole drilling and Downhole measurements
The borehole is located between lines G and H. Drilling was continuous down to 40 m and ecountered bedrock at 25 meters. The bedrock is varicoulored shale belonging to Monte Piano Marls Formation.
Down-hole P- and S-wave travel times were logged by Sezione di Geotecnica, Dipartimento di Ingegneria Civile, Università degli Studi di Firenze.
The bottom picture shows the first-pulse travel times as well as the corresponding profiles of average Vs and Vp values down to each depth. The inferred interval values of P-wave velocity are 520 m/s in the top 3 m above the water table, 1630 m/s in the body of the landslide, and 2850 m/s in the basement. For S-waves inferred interval velocities are 230 m/s and 625 m/s above the water table and in the basement respectively, while in the landslide below the water table the S-waves velocity increased approximately linearly with depth from about 300 m/s at the top to a value very close to that in the basement at the bottom.
photo gallery
Intro page
Preliminary investigation
Testing the instruments
Installation
Servicing and data download
Recording examples
Borehole drilling and Downhole measurements
Extra photos