Hypoplastic modelling of moisture-sensitive weathered rockfill materials

Abstract

For broken rock materials under stress the process of weathering and consequently the degradation of the solid hardness may be accelerated under water. Thus, the resistance of particles against abrasion and breakage can be strongly influenced by a change of the moisture content of the grains. The focus of this paper is on modelling the essential mechanical properties of moisturesensitive weathered coarse-grained rockfill materials using a hypoplastic constitutive model. The model takes into account the current void ratio, the effective stress, the strain rate and a moisture-dependent degradation of the solid hardness. Creep and stress relaxation during the process of degradation of the solid hardness are also included. It is shown that the results obtained from numerical simulations are in good agreement with experiments carried out with weathered granite.

Structural optimization in geotechnical engineering: basics and application

“…Hypoplastic model was originally developed for cohesionless materials. Recently, the model was extended to include cohesive soils (Huang et al [7], Weifner and Kolymbas [20], Mašín and Herle [10], Bauer [3]). Numerical investigation of boundary value problems using hypoplastic constitutive models was reported recently by Henke and Grabe [6], Salciarini and Tamagnini [14], Tejchman and Górski [18].…”

Effect of density and compressibility on K 0 of cohesionless soils

“…It should be noted that the dependency of K 0 of granular soils on other factors such as fabric and anisotropy can also be explored using hypoplasticity soil models when these factors are appropriately taken into account in the material functions [7,37,46]. K 0 values for different types of geomaterials such as clay and rock fill can be readily obtained as well using hypoplasticity models [4,31,36,50]. In addition, it is expected that hypoplasticity models can be used to examine the earth pressure coefficient under various loading conditions or different stress histories, including cyclic loading [37,45].…”

A 3D bounding surface model for rockfill materials

“…Hyperbolic model was early used for capturing the stress-strain behaviors of rockfill materials [12,13]. Hypoplastic constitutive models were also proposed to describe the mechanical characteristics of granular material [14][15][16][17][18][19]. Elastoplastic constitutive models have been widely applied to describe stress-strain relations of geomaterial including rockfill materials [20][21][22][23][24][25][26].…”