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<p>Between 2009 and 2015, the French national agency for the management of radioactive waste (ANDRA) conducted a unique long-term hydraulic interference test between two boreholes drilled within the undisturbed Oxfordian claystone at 490-m depth below ground level. This experiment was conducted at ANDRA’s Underground Research Laboratory (CMHM) in Bure, France. Pressure sensors measuring at isolated borehole sections enabled continuous pressure measurements from 2009 to 2013. Additionally, water injection tests were conducted in one of the six pressure monitoring intervals, and the injection flow rates were measured. This comprehensive dataset was used to estimate in situ hydraulic properties of the claystone at the decameter scale. Unlike traditional short-duration single-borehole tests that rely on simplified 1D or 2D representations, this study employed a fully 3D numerical model. Multiple conceptualizations of the hydrogeological system were examined, explicitly incorporating: (i) the undisturbed rock matrix, (ii) the borehole disturbed zone (BDZ), (iii) engineered sealing elements, and (iv) active hydraulic sinks such as the access drifts and the extensometer borehole. The calibrated model produced estimates of hydraulic conductivity and storage properties that are consistent with values obtained at smaller scales from single borehole tests and laboratory measurements on core samples. A reliable determination of the hydraulic conductivity and anisotropy of the undisturbed Callovian–Oxfordian claystone rock mass at decameter scale was obtained, based on field data measured at the planned depth of a deep geological repository for radioactive waste. The results underscore the critical importance of the precise modelling of the hydraulic system for the&#xa0;sound determination of the hydraulic parameter of the claystone&#xa0;rock mass.</p>

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Determination of hydraulic parameters of the undisturbed Callovian–Oxfordian claystone based on in situ long-term measurements performed at the CMHM Underground Rock Laboratory, Bure, France

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Jean Croisé,
  • Gerhard Mayer,
  • Rémi de La Vaissière

摘要

Between 2009 and 2015, the French national agency for the management of radioactive waste (ANDRA) conducted a unique long-term hydraulic interference test between two boreholes drilled within the undisturbed Oxfordian claystone at 490-m depth below ground level. This experiment was conducted at ANDRA’s Underground Research Laboratory (CMHM) in Bure, France. Pressure sensors measuring at isolated borehole sections enabled continuous pressure measurements from 2009 to 2013. Additionally, water injection tests were conducted in one of the six pressure monitoring intervals, and the injection flow rates were measured. This comprehensive dataset was used to estimate in situ hydraulic properties of the claystone at the decameter scale. Unlike traditional short-duration single-borehole tests that rely on simplified 1D or 2D representations, this study employed a fully 3D numerical model. Multiple conceptualizations of the hydrogeological system were examined, explicitly incorporating: (i) the undisturbed rock matrix, (ii) the borehole disturbed zone (BDZ), (iii) engineered sealing elements, and (iv) active hydraulic sinks such as the access drifts and the extensometer borehole. The calibrated model produced estimates of hydraulic conductivity and storage properties that are consistent with values obtained at smaller scales from single borehole tests and laboratory measurements on core samples. A reliable determination of the hydraulic conductivity and anisotropy of the undisturbed Callovian–Oxfordian claystone rock mass at decameter scale was obtained, based on field data measured at the planned depth of a deep geological repository for radioactive waste. The results underscore the critical importance of the precise modelling of the hydraulic system for the sound determination of the hydraulic parameter of the claystone rock mass.