Volume 5, Issue 2 (4-2012)
2012, 5(2): 1193-1216 |
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Sorosh A, Hashemi tabatabaee S, ghalandarzadeh A. Assessment of particle breakage in rockfill materials using triaxial testing. Journal of Engineering Geology 2012; 5 (2) :1193-1216
URL: http://jeg.khu.ac.ir/article-1-368-en.html
URL: http://jeg.khu.ac.ir/article-1-368-en.html
Abstract: (6962 Views)
All rockfill materials subjected to stresses above the normal geotechnical ranges exhibit considerable particle breakage. Particle breakage and crushing of the large particles to smaller ones result in a lower strength and higher deformability. The breakage of particle that is observed in the large scale triaxial tests, is usually expressed quantitatively by the Marsal breakage index, . This paper presents a method for calculating at any axial strain level in the large triaxial tests. The model used Rowe’s minimum energy principle ratio. The key parameter in modeling , is the friction angle which excludes dilation and breakage effects, . The results indicate that the internal friction angles at confining pressure equal and less than 200 kPa at the constant volume state is a unique value. Moreover, there is a linear relationship between the variation of energy spent on particle breakage to Marsal Breakage index with confining pressure, at failure axial strain.
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