CPT Installation of Fiber Optic Strain Extensometer

Members of the Soga Research Group distributed fiber optic team performed a field installation of a vertical fiber optic strain sensing cable using a Cone Penetration Test truck on Treasure Island in the San Francisco Bay….a new method of installing fiber optic cable for strain monitoring of vertical ground displacement developed at UC Berkeley. The Berkeley team has previously deployed vertical strain sensing fiber optic cable in drilled geotechnical boreholes, however this project represents the first deployment of strain cable using CPT. Distributed fiber optic sensing of subsurface strains offers a distinct benefit over conventional single- and multi-point borehole extensometer deployments; allowing measurement and localization of subsurface movements over the entire installed length rather than at discrete reference points. The resulting data can be used to estimate ground settlement and heave, as well as correlate observed movements with nearby construction and loading activities…. The setup for weekly fiber optic readings [uses a FOSA member] Omnisens analyzer and portable generator
CPT Installation of Fiber Optic Strain Extensometer
Berkeley Engineering News August 23, 2020
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