Experimental study on the breakage of porous grains under random loads: proposal for a probabilistic breakage criterion
DOI:
https://doi.org/10.14195/2184-8394_163_3Keywords:
grain breakage, lightweight expanded clay aggregate, WeibullAbstract
In this article, a breakage probabilistic criterion for expanded clay grains is presented. Expanded clay is a material formed by porous grains that can collapse under isocompression pressures. The criterion for breaking is that proposed by Serrano et al. (2016) for collapsible volcanic materials such as pyroclasts and allows considering grain breakage for any possible loading situation, including traction and compression. This proposed model is an advance over other models that consider simpler loading situations. To validate the model, more than 1,300 expanded clay grains have been broken in uniaxial, biaxial and triaxial compression (measuring all applied forces). In addition to breaks in direct traction. The proposed model can be easily implemented using the discrete element method (DEM) code and would allow simulating the failure of
materials with double porosity (porosity inside the grain and intergranular porosity), which can collapse only with pressure, a situation that occurs in expanded clay fills subjected to loads. of a certain magnitude.
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