Effects of particle size on crushing and deformation behaviors of rockfill materials
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 an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-03-01
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| Series: | Geoscience Frontiers |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987118302421 |
| _version_ | 1797712086314254336 |
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| author | Yang Xiao Minqiang Meng Ali Daouadji Qingsheng Chen Zhijun Wu Xiang Jiang |
| author_facet | Yang Xiao Minqiang Meng Ali Daouadji Qingsheng Chen Zhijun Wu Xiang Jiang |
| author_sort | Yang Xiao |
| collection | DOAJ |
| description | 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 |
| first_indexed | 2024-03-12T07:16:36Z |
| format | Article |
| id | doaj.art-d08c005dd3d14eabb2ea6a98ee13179e |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T07:16:36Z |
| publishDate | 2020-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-d08c005dd3d14eabb2ea6a98ee13179e2023-09-02T22:46:41ZengElsevierGeoscience Frontiers1674-98712020-03-01112375388Effects of particle size on crushing and deformation behaviors of rockfill materialsYang Xiao0Minqiang Meng1Ali Daouadji2Qingsheng Chen3Zhijun Wu4Xiang Jiang5School of Civil Engineering, Chongqing University, 83 Shazheng Street, Chongqing 400045, China; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China; State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China; Corresponding author. School of Civil Engineering, Chongqing University, 83 Shazheng Street, Chongqing 400045, China.School of Civil Engineering, Chongqing University, 83 Shazheng Street, Chongqing 400045, ChinaUniversite de Lyon, INSA LYON, Laboratoire GEOMAS, J.C.A. Coulomb, 34 avenue des Arts, 69621 Villeurbanne, FranceDepartment of Civil and Environmental Engineering, National University of Singapore, No. 21 Lower Kent Ridge Road, 119077, SingaporeSchool of Civil Engineering, Wuhan University, Wuhan 430072, ChinaSchool of Civil Engineering, Chongqing University, 83 Shazheng Street, Chongqing 400045, ChinaStrength 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 distributionhttp://www.sciencedirect.com/science/article/pii/S1674987118302421 |
| spellingShingle | Yang Xiao Minqiang Meng Ali Daouadji Qingsheng Chen Zhijun Wu Xiang Jiang Effects of particle size on crushing and deformation behaviors of rockfill materials Geoscience Frontiers |
| title | Effects of particle size on crushing and deformation behaviors of rockfill materials |
| title_full | Effects of particle size on crushing and deformation behaviors of rockfill materials |
| title_fullStr | Effects of particle size on crushing and deformation behaviors of rockfill materials |
| title_full_unstemmed | Effects of particle size on crushing and deformation behaviors of rockfill materials |
| title_short | Effects of particle size on crushing and deformation behaviors of rockfill materials |
| title_sort | effects of particle size on crushing and deformation behaviors of rockfill materials |
| url | http://www.sciencedirect.com/science/article/pii/S1674987118302421 |
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