首页|Heating-induced strengthening or weakening of clays during slow to fast
shearing at landslide stress levels
Heating-induced strengthening or weakening of clays during slow to fast
shearing at landslide stress levels
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Arxiv
Changes in temperature in landslide shear zones can derive from frictional
heating but also groundwater flow or heat exchange with the atmosphere. This is
especially relevant in shallow landslides under seasonal and long-term climatic
forcing. How temperature controls the shear resistance in these landslides is
poorly constrained. We explored the response of two pure clays (Ca-bentonite
and kaolin) under landslide stress levels (50-150 kPa) and slow-to-rapid
shearing (0.018-44.5 mm/min). We modified a ring-shear device to permit
temperature control (20-50 C). We observed important heating-induced
strengthening in bentonite during slow shearing, but also weakening and again
strengthening during faster shearing. Effects in kaolin were generally of
opposite sign and lower magnitude compared to those in bentonite. Although more
analyses are warranted in natural soils and in a lower temperature range, we
argue that the thermal sensitivity of clays may matter not only in fast and
large, but also in slow and shallow landslides in clay soils. However,
case-by-case investigations should be performed to evaluate how thermal
sensitivity combines with concurrent processes of atmosphere-soil interaction.
Arxiv
