Modelling the combined effects of creep and frictional heating in the development of landslides
Modelling the combined effects of creep and frictional heating in the development of landslides
In this work, different thermo-poro mechanical models for large scale landslides were developed to predict the transition between the creep and the catastrophic phases of a landslide. First, a refinement was made of an existing thermo-poro-mechanical landslide model, including a realistic formulation for the dynamics of the moving slide. The model equations were then solved by using an unconditionally stable numerical scheme and the results were compared with a similar existing model and data available from landslide case studies. It was found that the refined model gave different predictions for the slide’s acceleration and velocity which however were only marginally so in the time window of realistic run-out distances.
Secondly, a thermo-poro-mechanical model for landslides was developed based on rate process theory. The model was initially used in an attempt to back-analyse a real landslide case. It was subsequently used to explore factors that influence the transition from an initial phase of creep to a final catastrophic phase. It was found that a threshold initial velocity separates the creep and collapse regimes, beyond which frictional heating leads to the final failure.
A different thermo-poro-mechanical model for landslides based on a constitutive theory that combines a thermo-plasticity model with a creep model for soils was also developed. The model was initially used in an attempt to back analyse a real landslide. It is able to predict a transition between the creep and collapse phases. Thermal diffusivity of the shear band material plays a major role on the predicted duration of the creep phase. Finally a landslide model based on Perzyna’s visco-plasticity theory was also developed. It was found that the extremely low velocity predicted during the creep phase leads to insignificant heat dissipation inside the shearband making the prediction of thermal pressurization and collapse impossible with this model.
Vinayagamoorthy, S.
3cc222b9-1bf0-47af-9ee5-d53a699bc06f
May 2014
Vinayagamoorthy, S.
3cc222b9-1bf0-47af-9ee5-d53a699bc06f
Zervos, A.
9e60164e-af2c-4776-af7d-dfc9a454c46e
Vinayagamoorthy, S.
(2014)
Modelling the combined effects of creep and frictional heating in the development of landslides.
University of Southampton, Engineering and the Environment, Doctoral Thesis, 270pp.
Record type:
Thesis
(Doctoral)
Abstract
In this work, different thermo-poro mechanical models for large scale landslides were developed to predict the transition between the creep and the catastrophic phases of a landslide. First, a refinement was made of an existing thermo-poro-mechanical landslide model, including a realistic formulation for the dynamics of the moving slide. The model equations were then solved by using an unconditionally stable numerical scheme and the results were compared with a similar existing model and data available from landslide case studies. It was found that the refined model gave different predictions for the slide’s acceleration and velocity which however were only marginally so in the time window of realistic run-out distances.
Secondly, a thermo-poro-mechanical model for landslides was developed based on rate process theory. The model was initially used in an attempt to back-analyse a real landslide case. It was subsequently used to explore factors that influence the transition from an initial phase of creep to a final catastrophic phase. It was found that a threshold initial velocity separates the creep and collapse regimes, beyond which frictional heating leads to the final failure.
A different thermo-poro-mechanical model for landslides based on a constitutive theory that combines a thermo-plasticity model with a creep model for soils was also developed. The model was initially used in an attempt to back analyse a real landslide. It is able to predict a transition between the creep and collapse phases. Thermal diffusivity of the shear band material plays a major role on the predicted duration of the creep phase. Finally a landslide model based on Perzyna’s visco-plasticity theory was also developed. It was found that the extremely low velocity predicted during the creep phase leads to insignificant heat dissipation inside the shearband making the prediction of thermal pressurization and collapse impossible with this model.
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Published date: May 2014
Organisations:
University of Southampton, Infrastructure Group
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Local EPrints ID: 372760
URI: http://eprints.soton.ac.uk/id/eprint/372760
PURE UUID: 0f295d9c-f026-46fd-9268-785e66f3bc6b
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Date deposited: 19 Jan 2015 10:16
Last modified: 15 Mar 2024 03:16
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S. Vinayagamoorthy
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