Effect of stress paths on the particle crushing

Abstract

In previous studies, almost all they had carried out the crushing tests under usual tri-axial compression, Ko and simple shear conditions. However, it is necessary to perform the crushing test under general stress conditions in ground with controlled each principal stresses individually to find the mechanical characteristics of the particle crushing. Therefore, the purpose of this study is to confirm the effect for particle crushing under various stress paths in the combination of principal stresses. Authors plan the particle crushing tests with combinations of principal stresses operating the mean stress p, deviatoric stress q and Lode angle θ up to the Shear Failure Line (SFL) on the pie-plane. These particle crushing tests were carried out using the high pressure true tri-axial compression apparatus under the planned stress paths. As a result, the degree of Lode angles has little traction to the progress of the particle crushing and authors found that deviatoric stress q has essential effect on the particle crushing. In addition, the degree of particle crushing are little effected by the various monotonic stress paths on p-q plane when the maximum values of p and q are same.