Abstract
To better control the strength and deformation of the roadbed, a constitutive model of rockfill was established based on property-dependent plastic potential theory for geomaterials. The effect of the particle gradation on the anisotropy was described in the model. According to the effect of the particle grading and crushing on the fractal dimension, the fractal theory and fabric tensor were introduced to establish the yield and failure criteria of the rockfill. By combining the property-dependent concepts of the materials and the results of the rockfill strength test, a critical state line considering the microstructure, fractal dimension, particle breakage, and stress state of the rockfill was established. The dilatancy equation was derived based on the novel potential theory and the hardening criterion affected by the critical state was established. A constitutive model of the rockfill in the general stress space was established under the framework of the novel potential theory. The 3D strength and its intensity change in the π plane were simulated through the drainage strength test results, which verified the description of the critical state under various stress paths. By simulating the stress-strain relationship, the validity and rationality of the model were verified.
Highlights
Rockfill is a common engineering material that is largely used in railway, transportation, and highway roadbeds construction projects due to its high filling density, strong permeability, good compacting performance, and high strength
In this research, the yield failure criterion of rockfill will be proposed, the dilatancy equation of rockfill will be derived by proposed potential theory, hardening criterion considering the influence of critical state will be established, and the rationality of its 3D strength description will be verified through large-scale triaxial test results and the determination of effectiveness
Because of the research status of large particle sizes, compression crushing characteristics, and lack of relatively largescale triaxial test results and the difficult description on the constitutive equation, this research established a constitutive model based on the test results of rockfill
Summary
Rockfill is a common engineering material that is largely used in railway, transportation, and highway roadbeds construction projects due to its high filling density, strong permeability, good compacting performance, and high strength. Studying more about the stress, strain, and deformation characteristics of rockfill materials under various loads in detail and establishing a reasonable and effective constitutive model were of great significance to the theoretical analysis of rockfill engineering application and the numerical calculation and analysis of transportation geotechnics [1,2,3]. In this research, the property-dependent plastic potential theory will be extended to describe anisotropy characteristics of rockfill, and a constitutive model is proposed for rockfill with general stress space. In this research, the yield failure criterion of rockfill will be proposed, the dilatancy equation of rockfill will be derived by proposed potential theory, hardening criterion considering the influence of critical state will be established, and the rationality of its 3D strength description will be verified through large-scale triaxial test results and the determination of effectiveness
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