Characterizing dynamic load propagation in cohesionless granular packing using force chain--颗粒学报PARTICUOLOGY

Fu, L., Zhou, S., Zheng, Y., & Zhuang, L. (2023). Characterizing dynamic load propagation in cohesionless granular packing using force chain. Particuology, 81, 135-148. https://doi.org/10.1016/j.partic.2023.01.007

Characterizing dynamic load propagation in cohesionless granular packing using force chain

Longlong Fu ^{a b *}, Shunhua Zhou ^b *, Yuexiao Zheng ^{b c}, Li Zhuang ^d

a Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai, 201804, China
b Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai, 201804, China
c Municipal Public Engineering Design Institute, Shanghai Urban Construction Municipal Engineering (Group) Co., Ltd., Shanghai, 200065, China
d Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, South Korea

10.1016/j.partic.2023.01.007

Volume 81, October 2023, Pages 135-148

Received 20 September 2022, Revised 30 December 2022, Accepted 3 January 2023, Available online 23 January 2023, Version of Record 1 February 2023.

E-mail: longlongfu@tongji.edu.cn, zhoushh@tongji.edu.cn

Highlights

• A criterion is proposed to recognize skeleton structures propagating dynamic load.

• Dynamic force chain characterizes the coherent propagation of dynamic load.

• Force chains' spatial distribution provides a direct measure of load diffusion.

• Force chain evolution shows strong correlation with macroscopic responses.

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.

Graphical abstract

Keywords

Granular materialsIndentation test; Cyclic load; Dynamic force chain; Coherent propagation

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