Particle mechanics modeling of creep behavior of rockfill materials under dry and wet conditions |
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| Institution: | 1. State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, PR China;2. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, PR China;1. School of Energy and Mining Engineering, China University of Mining and Technology, Beijing, 100083, PR China;2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, PR China;3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, 100083, PR China;1. Research Institute of Mining and Environment (RIME UQAT-Polytechnique), Department of Civil, Geological and Mining Engineering, Polytechnique Montréal, Québec, Canada;2. GeM UMR CNRS 6183, Ecole Centrale de Nantes, France;1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China;3. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China |
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| Abstract: | Rockfill is an important construction material for infrastructure engineering, such as dams, railways and airport foundations, which display a long-term post-construction settlement. However, the main mechanisms for rockfill creep and weathering influence still remain poorly understood. Particle mechanics method is used to understand the rockfill creep process under dry and wet conditions. Different bond-aging models and wetting models that represent different degradation and weakening mechanisms are compared, in order to clarify the principle and secondary mechanisms for rockfill creep and weathering influence. The results show that rockfill aggregate breakage in terms of angularity abrasion is the main source for rockfill creep under dry state. Wetting can induce additional strain mainly due to the reduction of contact friction coefficient, i.e. lubrication, and the bond strength reduction just plays a secondary role in producing additional strain. The earlier the wetting occurs during rockfill creep, the more rapidly the rockfill becomes stable. The wetting–drying cycles can induce strain evolution in a ‘stepped’ way, which is in agreement with experimental observation. The practical implications from the modeling and the outstanding issues in this study are also discussed. |
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| Keywords: | Rockfill creep Particle mechanics method Water weakening Wetting–drying cycles Particle breakage Abrasion |
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