The properties of particle lubrication is studied based on end-face tribotester in this thesis, and the process of the particle damage is simulated by using the discrete element numerical analysis techniques.

Research on particle crushing of calcareous sands under triaxial shear;

The influence of particle crushing on the shear strength of granular materials was studied using DRS-1 super-high-pressure direct/residual shear testing system.

Numerical simulations of particle breakage property of sand under high pressure 1D compression condition by use of particle flow code;

Rowe’s stress-dilatancy model modified for energy dissipation of particle breakage;

Constitutive model for coarse granular aggregates incorporating particle breakage

Constitutive model for rockfill material considering grain crushing;

For high concrete faced rockfill dam,the grain crushing is so large in high stress field which may increase the deformation rate of dam body that it should be considered in numerical calculation.

According to the tests,the cause of grain breakage due to wetting is explained;and the wetting deformation and grain breakage value ex.

In this paper,the grain breakage laws and mechanical properties are analyzed comprehensively,and the relationships among breakage,dilatancy and breakage strength component are discussed,with test results of Three Gorge weathered granite rocksoil,and Moriyoshiyama andesite and basalt of Japan.