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| Experimental study on mechanical behaviors and particle breakage of sandy gravel |
| WANG Yongxin1，SHAO Shengjun1，2，WANG Zhi1#br# |
| (1. Institute of Geotechnical Engineering，Xi'an University of Technology，Xi'an，Shaanxi 710048，China；2. Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering，Xi'an University of Technology，Xi'an，Shaanxi 710048，China) |
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Abstract The particle breakage of granular geomaterials under loading alters the particle composition and further affects their mechanical properties. In order to reveal the effect of particle breakage on shear strength characteristics，a series of true triaxial shearing tests with different stress paths on sandy gravel were carried out by using a large true triaxial apparatus，and the breakage mechanisms of different particle breakage patterns were described. It is revealed that particle breakage is an important factor for the nonlinearity of the shear strength. A power function fitting strength formula was established and the non-linear shear strength indexes were calculated. The influence of particle breakage on the critical state line in meridian plane was described by introducing the strength factor，which is defined by the ratio of the area enclosed by the non-linear strength curve and the linear critical state line to the area under the linear critical state line. The larger the strength factor，the more significant the nonlinear characteristic of the critical state line in meridian plane，and the larger the mean spherical stress，the greater the impact of particle breakage on the shear strength. The sieving results show that the particle breakage rate by Marsal is exponentially related to the strength factor. The variation rules of the internal friction angle and interlocking strength with the index of fine-grained breakage were sorted out. It is shown that the particle breakage rates of particles larger than and less than 1 mm respectively increase and decrease with increasing the mean principal stress. The internal friction angle and occlusion strength show a certain correlation with the change of the breakage rate.
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2020, Vol. 39 
