#6626. Strain characteristics and permeability evolution of faults under stress disturbance monitoring by fibre bragg grating sensing and pressure pulses

December 2026publication date
Proposal available till 21-05-2025
4 total number of authors per manuscript0 $

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Journal’s subject area:
Geophysics;
Geotechnical Engineering and Engineering Geology;
Energy (all);
Economic Geology;
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Abstract:
The sealing and structural stability of faults must be considered in many underground engineering endeavours, such as underground energy extraction and CO2 geological storage. In order to simultaneously study the evolution laws of fault sealing and structural stability evolution law under stress disturbance, the fault samples were first consolidated under previous effective stress (Ppre = 10 MPa) for 62 h to imitate the fault being under the ground stress; then, the effective stress (Pe) was reduced to 0.5 MPa and gradually changed to 20 MPa to imitate the stress disturbance. Permeability and strain were measured throughout the stress disturbance by the pressure pulse method and fibre Bragg grating (FBG) sensors. In particular, high-precision FBG sensors were applied inside the fault to obtain the internal strains.
Keywords:
Fibre Bragg grating; Illite fault gouge; Internal strain response; Permeability evolution; Stress disturbance

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