A novel soil breakage index incorporating particle surface energy change and its application to predict the evolution of PSD during triaxial shearing
Feng Gao,Jungao Zhu,Tao Wang,Long Wang,Fulong Ma,Qixun Luo
Abstract
Particle breakage is an unavoidable phenomenon in granular soils, fundamentally representing the transformation of deformation energy into the surface energy. This paper, based on fractal theory, derives analytical solution for the breakage index incorporating particle surface energy change. It compares this novel breakage index with the established breakage indices. Qualitatively, the novel breakage index demonstrates similar trends to the established breakage indices. Quantitatively, the established breakage indices tend to overestimate the degree of particle breakage. Utilizing the novel breakage index, a particle breakage model and a particle size distribution (PSD) evolution model were suggested and validated. The surface morphology of the particle breakage model is found to conform to a hyperbolic paraboloid. The PSD evolution model accurately reflects the evolution trends of granular soils. Notably, quartz sand exhibits relatively high prediction accuracy, while the prediction accuracy for rockfill and carbonate sand is slightly limited.
Feng Gao, Jungao Zhu — Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China
Tao Wang — School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Road, Nanjing 210023, China
Long Wang — Huaneng Lancang River Hydropower Inc., Kunming, Yunnan 650214, China
Fulong Ma and Qixun Luo — Chengdu Engineering Corporation Limited, Power China. Chengdu, Sichuan 610072, China
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