17.04.2023 | 17:00-18:20

Thomas Telford Prestige Paper series: the Ruedlingen field experiment

Speakers: Professor Francesca Casini and Professor Amin Askarinejad.

Past event: Please note this event information is displayed for informational purposes only.

Introduction

This is the first Lecture in the Thomas Telford Prestige Paper series, showcasing award winning papers. This paper upon which this lecture is based, won the George Stepheson Medal at the 2022 ICE Awards Ceremony.

The paper 'Hydro-mechanical analysis of a surficial landslide triggered by artificial rainfall: the Ruedlingen field experiment' can be downloaded HERE.

This is an on-line event (via booking link).

Synopsis

The lecture 'Hydro-mechanical analysis of a surficial landslide triggered by artificial rainfall: the Ruedlingen field experiment' overviews the relevance of shallow landslides induced by rainfall.

In detail, it interprets the hydromechanical behaviour of a steep, forested, instrumented slope during an artificial rainfall event, which triggered a shallow slope failure 15h after rainfall initiation. The soil’s mechanical response has been simulated by coupled hydro-mechanical finite-element analyses using a critical state constitutive model extended to unsaturated conditions. Failure occurs within a colluvium shallow soil cover, characterised as a silty sand of low plasticity. The hydraulic and mechanical parameters are calibrated based on an extended set of experimental results, ranging from water retention curve measurements to triaxial stress path tests under saturated and unsaturated conditions.

Rainfall is simulated as a water flux at the soil surface and suitable boundary conditions account for the hydromechanical interaction between the soil cover and the underlying bedrock. The results are compared with field data of the mechanistic and the hydraulic responses up to failure and are found to provide a very satisfactory prediction.

The study identifies water exfiltration from bedrock fissures as the main triggering agent, resulting in increased pore pressures along the soil–bedrock interface, reduced available shear strength and cause extensive plastic straining, leading to the formation and propagation of a failure surface.

Speakers

  • Professor Francesca Casini

    University of Rome Tor Vergata

  • Professor Amin Askarinejad

    Delft University of Technology/Swiss Federal Office of Energy

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