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  • Ambient Vibration Simulations of Damaged Rock Slopes Using Distinct-element Modeling

    Description:
    This dataset contains code used to generate and the results of 2D numerical modeling simulations of ambient resonance in damaged rock slopes. All simulations were performed using the Universal Distinct Element Code (UDEC) version 7.0. We simulated progressive damage for three different landslide types: slab toppling, flexural toppling, and planar sliding. For each scenario we simulated several stages of progressive rock slope damage. Subsequently, we recorded the resonance response of the rock slope at each stage by measuring x-direction velocity at one or more measuring points throughout the model.
    Subject:
    landslides, mathematical modeling, slope stability, and engineering geology
    Creator:
    Moore, Jeffrey R. and Jensen, Erin K.
    Owner:
    Jeff Moore
    Based Near Label Tesim:
    Utah, Utah, United States
    Language:
    English
    Date Uploaded:
    10/18/2023
    Date Modified:
    10/28/2023
    Date Created:
    2023-01-01 to 2023-10-18
    Resource Type:
    Dataset
    Identifier:
    https://doi.org/10.7278/S50d-j662-kdt9

  • Aletsch Glacier subglacial water pressure and temperature data

    Description:
    Subglacial water pressures influence groundwater conditions in proximal alpine valley rock slopes, varying with glacier advance and retreat in parallel with changing ice thickness. Fluctuating groundwater pressures in turn increase or reduce effective joint normal stresses, affecting the yield strength of discontinuities. Here we extend simplified assumptions of glacial debuttressing to investigate how glacier loading cycles together with changing groundwater pressures generate rock slope damage and prepare future slope instabilities. Using hydromechanical coupled numerical models closely based on the Aletsch Glacier valley in Switzerland, we simulate Late Pleistocene and Holocene glacier loading cycles including long-term and annual groundwater fluctuations. Measurements of transient subglacial water pressures from ice boreholes in the Aletsch Glacier ablation area, as well as continuous monitoring of bedrock deformation from permanent GNSS stations helps verify our model assumptions. While purely mechanical glacier loading cycles create only limited rock slope damage in our models, introducing a fluctuating groundwater table generates substantial new fracturing. Superposed annual groundwater cycles increase predicted damage. The cumulative effects are capable of destabilizing the eastern valley flank of our model in toppling-mode failure, similar to field observations of active landslide geometry and kinematics. We find that hydromechanical fatigue is most effective acting in combination with long-term loading and unloading of the slope during glacial cycles. Our results demonstrate that hydromechanical stresses associated with glacial cycles are capable of generating substantial rock slope damage and represent a key preparatory factor for paraglacial slope instabilities.
    Subject:
    Geology
    Creator:
    Moore, Jeffrey, Loew, Simon, Limpach, Philippe, Gischig, Valentin, Grämiger, Lorenz, and Funk, Martin
    Owner:
    Jeff Moore
    Based Near Label Tesim:
    Aletsch Glacier, Valais, Switzerland
    Language:
    English
    Date Uploaded:
    01/03/2020
    Date Modified:
    12/09/2021
    Date Created:
    Borehole P1 20130712 09:28:09 to 20140808 09:11:14 and Borehole P2 20130716 05:00:03 to 20140808 22:10:44
    Resource Type:
    Dataset
    Identifier:
    https://doi.org/10.7278/S50D-A50H-3TE4