Microanchored borehole fiber optics allows strain profiling of the shallow subsurface.

ABSTRACT: Vertical deformation profiles of subterranean geological formations are conventionally measured by borehole extensometry. Distributed strain sensing (DSS) paired with fiber-optic cables installed in the ground opens up possibilities for acquiring high-resolution static and quasistatic strain profiles of deforming strata, but it is currently limited by reduced data quality due to complicated patterns of interaction between the buried cables and their surroundings, especially in upper soil layers under low confining pressures. Extending recent DSS studies, we present an improved approach using microanchored fiber-optic cables-designed to optimize ground-to-cable coupling at the near surface-for strain determination along entire lengths of vertical boreholes. We proposed a novel criterion for

SUBMITTER: Zhang CC 

PROVIDER: S-EPMC8080621 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature