17:15 〜 18:45
[HRE12-P01] Preliminary research on earthquake induced shear displacement of fractures based on Coulomb's slip model
キーワード：Coulomb's slip model, Shear displacement of fractures, Earthquake induced reactivation
Global warming is a well-known and serious issue for everyone living on Earth. To slow down the rate of temperature increasing, carbon capture and storage (CCS) are now becoming one of the primary solutions for reducing carbon dioxide in the atmosphere. However, perturbation of stress field and strain field caused by earthquake events near CCS site may trigger the reactivation of small faults and fractures which influence the integrity of storage system. In the purpose of quantitatively analyzing movement of faults and fractures, Coulomb’s slip model which embedded in commercial software for analysis of rock simulation and soil dynamics (3DEC) was used to calculate critical shear displacement for fracture growth and distribution of shear displacement on faults. Different friction angles were applied evaluating how mechanical parameter affects distribution of shear displacement. We also compared the numerical results with analytical solutions to see the difference. Preliminary results showed that (1) critical shear displacement is proportional to fracture size; (2) friction angle is negatively correlated to shear displacement; (3) distribution of shear displacement is affected by shear direction; (4) curve of numerical results and analytical solutions is not consistent, but both show high shear displacement in the center of fracture. We speculate that the differences between numerical and analytical results are related to mechanical parameters of host rocks. However, detail remains unsolved and is needed to be further studied.