Modelling yield cap evolution in sandstone based on brittle creep experiments

Choens, R. C.; Bauer, S. J.; Shalev, E.; Lyakhovsky, V.

doi:10.1016/j.ijrmms.2021.104706

Modelling yield cap evolution in sandstone based on brittle creep experiments

Journal Article · Wed Mar 31 00:00:00 EDT 2021 · International Journal of Rock Mechanics and Mining Sciences

DOI:https://doi.org/10.1016/j.ijrmms.2021.104706· OSTI ID:1781555

Choens, R. C. ^[1]; Bauer, S. J. ^[1]; Shalev, E. ^[2]; Lyakhovsky, V. ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Geological Survey of Israel, Jerusalem (Israel)

The Zenifim Formation is being considered as a potential disposal formation for a deep borehole nuclear repository concept in Israel. Site selection and repository construction are intended to ensure that waste is separated from circulating groundwater, but long-term deformation of the wellbore could potentially create fluid flow pathways. To understand how time-dependent rock strength could affect wellbore stability, here we conducted creep tests under low to moderate confining pressures on retrieved core from the Zenifim formation. During creep, samples strain slowly as gradual damage accumulation progressively weakens the samples. Failure eventually occurred through the near-instantaneous formation of a shear fracture. Experimental results were used to calibrate a continuum damage poro-elastic model for sandstones. The calibrated damage-poro-elastic model successfully simulates different types of loading experiments including quasi-static and creep. The state of strain in experiments is close to yield during loading as the yield cap continuously evolves with damage accumulation. For creep tests, most damage occurs during triaxial loading. Minor damage accumulation occurs under constant load until the final stage of creep, where damage accelerates and promotes unstable fracturing.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1781555

Alternate ID(s):: OSTI ID: 1815184

Report Number(s):: SAND--2021-3240J; 694877

Journal Information:: International Journal of Rock Mechanics and Mining Sciences, Journal Name: International Journal of Rock Mechanics and Mining Sciences Vol. 141; ISSN 1365-1609

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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