Characterizing dynamic load propagation in cohesionless granular packing using force chain |
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| Institution: | 1. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai, 201804, China;2. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai, 201804, China;3. Municipal Public Engineering Design Institute, Shanghai Urban Construction Municipal Engineering (Group) Co., Ltd., Shanghai, 200065, China;4. Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, South Korea;1. Department of Civil, Mining and Process Engineering, Namibia University of Science and Technology, Windhoek, Namibia;2. Department of Civil Engineering, Xi’an Jiaotong-Liverpool University, Suzhou, China;3. Faculty of Engineering and Information Sciences, University of Wollongong, Dubai Campus, Dubai, United Arab Emirates;1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Key Laboratory of Track Engineering, Beijing Jiaotong University, Beijing 100044, China;3. Engineering Structures Department, Delft University of Technology, the Netherlands;4. China Academy of Railway Sciences Co., Ltd., Beijing 100081, China |
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| Abstract: | When dynamic load is applied on a granular assembly, the time-dependent dynamic load and initial static load (such as gravity stress) act together on individual particles. In order to better understand how dynamic load triggers the micro-structure's evolution and furtherly the ensemble behavior of a granular assembly, we propose a criterion to recognize the major propagation path of dynamic load in 2D granular materials, called the “dynamic force chain”. Two steps are involved in recognizing dynamic force chains: (1) pick out particles with dynamic load larger than the threshold stress, where the attenuation of dynamic stress with distance is considered; (2) among which quasi-linear arrangement of three or more particles are identified as a force chain. The spatial distribution of dynamic force chains in indentation of granular materials provides a direct measure of dynamic load diffusion. The statistical evolution of dynamic force chains shows strong correlation with the indentation behaviors. |
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| Keywords: | Granular materials Indentation test Cyclic load Dynamic force chain Coherent propagation |
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