Grain crushing and its effects on rheological behavior of weathered granular soil

Abstract

To disclose the grain crushing effects on the weathered granular soil rheological behavior, a series of rheological tests (odometer compression and triaxial shearing) were carried out. At the same time, the sieving analysis tests of these specimens were also executed before and after tests, and the grain crushing degree, B_r and n₅, were collectively adopted to estimate the grain crushing. The grain crushing degree depends on the stress path, stress level, and load time, especially, the longer load time and more intensive gradient shearing path will increase the grain crushing quantity. The Hardin crushing degrees B_r are 0.191, 0.118 and 0.085 in the ordinary compression, rheological compression and triaxial rheological shearing, respectively; The grain crushing degrees n₅ are 1.9, 1.4 and 1.32, respectively. The strain softening phase indicates the grain crushing and diffusive collapse, and the strain hardening phase indicates the rearrangement of these crushed grains and formation of new bearing soil skeleton. The rheological deformation of granular soil can be attributed to the coarse grain crushing and the filling external porosity with crushed fragments.

Keywords

grain crushing degree / rheological behavior / weathered granular soil / tri-axial rheological tests / odometer compression test

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