论文信息 - A computational procedure for instationary temperature-dependent snow creep

A computational procedure for instationary temperature-dependent snow creep

A computational procedure to model instationary creep movements in alpine snowpacks is presented. The model allows the study of large volumetric and shear strains (new snowfall), temperature dependent material behaviour (sudden warming) and progressive creep fracture. These processes are all important factors in natural avalanche release. A viscoelastic material model for snow is proposed in which the constitutive properties are characterized on planes of various orientations within the material. This model is conceptually simple because it does not employ complicated tensorial arguments. It is, however, capable of modelling the highly nonlinear and complex material behaviour of snow including the influence of material microstructure. The model requires only a few parameters which can be determined from simple uniaxial or triaxial experiments. The new constitutive model and numerical procedure is verified using two field and laboratory experiments.

P. Bartelt | M. Christen

[1] J. Devaux. L’économie radio-thermique des champs de neige et des glaciers , 1933 .

[2] An Attempt to Clarify Triaxial Creep Mechanics of Snow , 1967 .

[3] Short Note: Finite-Element Stress Analysis of Avalanche Snowpacks , 1971 .

[4] Material property and boundary condition effects on stresses in avalanche snow-packs , 1974 .

[5] The Modeling and Measurement of the Deformation of a Sloping Snow-Pack , 1977 .

[6] A Fracture Criterion for Snow , 1977 .

[7] An Incremental Formulation of Constitutive Equations for Deposited Snow , 1980 .

[8] Byung H. Oh,et al. Microplane Model for Progressive Fracture of Concrete and Rock , 1985 .

[9] Pere C. Prat,et al. Microplane Model for Brittle-Plastic Material: I. Theory , 1988 .

[10] Zdenek P. Bazant,et al. Microplane Model for Brittle‐Plastic Material: II. Verification , 1988 .

[11] Cv Clemens Verhoosel,et al. Non-Linear Finite Element Analysis of Solids and Structures , 1991 .

[12] Josef M. Oberhuber,et al. Snow cover model for global climate simulations , 1993 .

[13] E. Morris,et al. Modelling mass and energy exchange over polar snow using the DAISY model , 1994 .

[14] M. König,et al. The thermal conductivity of seasonal snow , 1997, Journal of Glaciology.

[15] P. Bartelt,et al. Operational Use of a Snowpack Model for the Avalanche Warning Service in Switzerland: Model Development and First Experiences , 1998 .