Abstract
The dilatancy behavior of rockfills is relate to the stress level, the initial state and particle breakage. In this paper, based on the critical state theory, the state-dependent dilatancy theory of rockfills is established, and it is introduced into the state-dependent constitutive model of coarse materials, so the state-dependent constitutive model of rockfills is formulated. According to the large-scale triaxial testing results, using the Fortran program modelling the experimental results, then, comparing the test results and simulation results, only one set parameters of state-dependent constitutive model of rockfills can reflect the strain softening and dilatancy properties of rockfills under the condition of different density, gradation and confining pressure. Therefore, the rationality of the state-dependent constitutive model of rockfills is verified.
Highlights
Dilatancy is an important engineering characteristic of granular materials
It can be seen from equation (10) that the void ratio of sand is different from the rockfills’ when the effective mean normal stress is zero, which is relate to the initial state, stress level and particle breakage. when the shearing shrinkage is transited to the dilatancy, the dilatancy ratio is equal to zero, the model parameter
In order to reflect the shear deformation behavior of rockfills rationally, the newly state dependent dilatancy function of rockfills is introduced into the state dependent constitutive model of coarse granular materials, which is proposed by Li and Dafalias [17], the constitutive model of rockfills is as follows
Summary
Dilatancy is an important engineering characteristic of granular materials. In general, volume expansion in shearing is called shear expansion, and volume shrinkage is called shear contraction [1]. The dilatancy behavior of sand has been studied [3,4,5,6,7,8], and the state dependent dilatancy theory of sand has been established Both rockfills and sand are coarse granular materials, but rockfills has many different engineering properties as large particle size, high strength, small deformation and particle breakage. Chu [13] researches the dilatancy behavior of coarse materials, he believes that the dilatancy function of Modified Cambridge model can’t reflect the dilatancy behavior of coarse materials, Row’s dilatancy function underestimating its compressibility in the contraction stage, and overestimating its dilatancy behavior in the shear expansion stage, so he studies the relationship between the density, confining pressure and dilatancy by large scale triaxial experiment. A numerical simulation of largescale triaxial test is carried out by compiling Fortran program, comparing the test results and simulation results, only one set parameters of state-dependent constitutive model of rockfills can reflect the strain softening and dilatancy properties
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