Abstract
The particle breakage property under loading is an important factor affecting the nonlinearity of the shear strength and stress-strain curves of coarse-grained soils. The macromechanical behaviors of coarse granular materials under consolidation and drainage shearing were tested by using a large true triaxial apparatus. The particle breakage mechanism has been analyzed by the fluctuation change of stress-strain curve and particle composition change. It was shown that the particle shape is an extremely important microproperty of the influence of granular material breakage. The variation rules of the internal friction angle and interlocking strength with the index of fine-grained breakage were sorted out, and the critical particle size for measuring the two friction modes under the given gradation was determined to be 1 mm. In addition, the numerical analysis was conducted by simulating the microshape parameters of particles. The conclusion is as follows: (1) The effect of shape parameters on shear strength can be simulated using the smoothness indexFd. (2) Compared with spherical particles, irregular-shaped particles lead to a decrease in the number of strong force chains. Moreover, more coordination numbers are needed to maintain a stable configuration, and the shear strength is improved.
Highlights
In high rockfill dams or embankment engineering, the properties of granular materials as the main filling material are important parameters applied widely to designing and constructing
Several investigators [11] attempted to establish an elastoplastic constitutive model that considers the effect of energy consumption associated with particle breakage during shearing. e crushing phenomenon of coarse-grained materials was simulated using the discrete element method to verify the dependence of particle strength on the particle size by Alaei and Mahboubi [12]
Duncan et al [26], based on conventional triaxial compression tests, proposed that the nonlinear strength parameters should take into account the characteristics that the internal friction angle of granular materials decreases with increasing confining pressure. e value of φ is the angle between the tangent of a stress circle passing through the origin and the abscissa
Summary
In high rockfill dams or embankment engineering, the properties of granular materials as the main filling material are important parameters applied widely to designing and constructing. Several investigators [11] attempted to establish an elastoplastic constitutive model that considers the effect of energy consumption associated with particle breakage during shearing. Shinohara et al [16] had successively studied the influence of the particle shape on the angle of internal friction by the triaxial compression test. Some researchers have studied the mechanical response of granular media using commercial numerical software to simulate different particle shapes. Is paper is arranged as follows: first, the particle breakage rates of different particle sizes after true triaxial test are sorted out, and the relationship between shear strength parameters (internal friction angle and interlocking strength) and particle breakage rates is revealed. E influence of shape parameters, such as sphericity, angularity, and roughness, on the shear strength is analyzed from the point of the force chain distribution and contact state The particle breakage can be macroscopically investigated considering different factors such as intermediate principle stress and initial confining pressure. en, combined with the numerical method, the simulation of the microshape parameters of unbreakable particles is carried out. e influence of shape parameters, such as sphericity, angularity, and roughness, on the shear strength is analyzed from the point of the force chain distribution and contact state
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