1. Effects of particle size on crushing and deformation behaviors of rockfill materials
- Author
-
Xiang Jiang, Yang Xiao, Minqiang Meng, Zhijun Wu, Qingsheng Chen, Ali Daouadji, School of Civil Engineering (SCE), State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology (CUMT), Key Laboratory of New Technology for Construction of Cities in Mountain Area (MOE), Chongqing University [Chongqing], State Key Laboratory of Coal Mine Disaster Dynamics and Control, Groupe de Recherche en Géomécanique (GRG), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Department of Civil and Environmental Engineering [Singapore], National University of Singapore (NUS), WuHAN School of Civil Engineering (SCE), and The authors would like to acknowledge the financial support from the 111 Project (Grant No. B13024), the National Science Foundation of China (Grant Nos. 51509024, 51678094 and 51578096), the Fundamental Research Funds for the Central Universities (Grant No. 106112017CDJQJ208848), the Special Financial Grant from the China Postdoctoral Science Foundation (Grant No. 2017T100681), and the State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology (Grant No. SKLGDUEK1810).
- Subjects
Materials science ,010504 meteorology & atmospheric sciences ,010502 geochemistry & geophysics ,01 natural sciences ,Stress (mechanics) ,Breakage ,Rockfill materials ,[SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques ,Composite material ,Grain crushing ,0105 earth and related environmental sciences ,Weibull distribution ,[SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable ,Weibull modulus ,lcsh:QE1-996.5 ,[SPI.GCIV.GEOTECH]Engineering Sciences [physics]/Civil Engineering/Géotechnique ,Compression (physics) ,Overburden pressure ,lcsh:Geology ,General Earth and Planetary Sciences ,One-dimensional compression ,[SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations ,Particle size ,Single-particle strength ,[SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures ,Deformation (engineering) ,[SPI.GCIV.MAT]Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction - Abstract
Strength and deformation behaviors of rockfill materials, key factors for determining the stability of dams, pertain strongly to the grain crushing characteristics. In this study, single-particle crushing tests were carried out on rockfill materials with nominal particle diameters of 2.5 mm, 5 mm and 10 mm to investigate the particle size effect on the single-particle strength and the relationship between the characteristic stress and probability of non-failure. Test data were found to be described by the Weibull distribution with the Weibull modulus of 3.24. Assemblies with uniform nominal grains were then subjected to one-dimensional compression tests at eight levels of vertical stress with a maximum of 100 MPa. The yield stress in one-dimensional compression tests increased with decreasing the particle size, which could be estimated from the single-particle crushing tests. The void ratio-vertical stress curve could be predicted by an exponential function. The particle size distribution curve increased obviously with applied stresses less than 16 MPa and gradually reached the ultimate fractal grading. The relative breakage index became constant with stress up to 64 MPa and was obtained from the ultimate grading at the fractal dimension (α=2.7). A hyperbolical function was also found useful for describing the relationship between the relative breakage index and input work during one-dimensional compression tests. Keywords: Grain crushing, Single-particle strength, One-dimensional compression, Rockfill materials, Weibull distribution
- Published
- 2018
- Full Text
- View/download PDF