Evaluation of CBR of Graded Crushed Stone of Flexible Base Structural Layer Based on Discrete Element Model

doi:10.3390/ma16010363

	Evaluation of CBR of Graded Crushed Stone of Flexible Base Structural Layer Based on Discrete Element Model
	Hu, Zhaoguang 1; Liu, Heng 2; Zhang, Weiguang 3; Hei, Tianqing 3; Ding, Xunhao 3; Dong, Zezhen 3
	2023-01
发表期刊	MATERIALS
卷号	16 期号:1
摘要	In order to study the mechanical properties of graded crushed stone, the discrete element method is used to simulate the CBR test of graded crushed stone. Aiming at the composition structure of graded crushed stone material, the PFC3D simulation software is used to construct the test model, and the process of constructing the virtual specimen model of the graded crushed stone discrete element model is discussed in detail. A servo mechanism is used to control the speed of the wall in the software, so as to control the virtual confining pressure imposed on graded crushed stone by the wall and simulate the real CBR test environment. The micro-parameter calibration of the virtual test is carried out by comparing the indoor and virtual CBR specimens of a single particle size specimen and three groups of graded crushed stone specimens. The comparison result shows that the stress-strain characteristics of the graded crushed rock obtained by the discrete element simulation during the uniaxial penetration process have a high degree of similarity, which can verify the accuracy of the model establishment. With the increase in the penetration depth, the penetration force of the aggregates of various particle sizes gradually increases, and the penetration force and the penetration depth are basically linear, and when the particle size is greater than 9.5 mm, the increase in particle size has little effect on the CBR test results. Under the certain conditions, the contact stiffness of graded crushed stone particles with particle sizes of 4.75 mm, 9.5 mm, 13.2 mm, 16 mm, and 19 mm should be 0.88 x 10(7) (N/m), 0.98 x 10(7) (N/m), 1.10 x 10(7) (N/m), 1.25 x 10(7) (N/m), and 2.05 x 10(7) (N/m), respectively. The recommended value of the contact stiffness of the small spherical particles increases with the increase in the particle size. This model can provide a basis for studying the micromechanical state of graded crushed stone and physical mechanics tests.
关键词	graded crushed stone gradation the discrete element method the CBR test
DOI	10.3390/ma16010363
收录类别	SCIE
语种	英语
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000909277200001
出版者	MDPI
原始文献类型	Article
EISSN	1996-1944
引用统计	被引频次[WOS]：0 [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.library.ouchn.edu.cn/handle/39V7QQFX/168599
专题	国家开放大学江苏分部
通讯作者	Hei, Tianqing
作者单位	1.China Rd & Bridge Corp, Beijing 100011, Peoples R China; 2.Jiangsu Open Univ, Sch Foreign Languages, Nanjing 210036, Peoples R China; 3.Southeast Univ, Sch Transportat, Nanjing 211189, Peoples R China
推荐引用方式 GB/T 7714	Hu, Zhaoguang,Liu, Heng,Zhang, Weiguang,et al. Evaluation of CBR of Graded Crushed Stone of Flexible Base Structural Layer Based on Discrete Element Model[J]. MATERIALS,2023,16(1).
APA	Hu, Zhaoguang,Liu, Heng,Zhang, Weiguang,Hei, Tianqing,Ding, Xunhao,&Dong, Zezhen.(2023).Evaluation of CBR of Graded Crushed Stone of Flexible Base Structural Layer Based on Discrete Element Model.MATERIALS,16(1).
MLA	Hu, Zhaoguang,et al."Evaluation of CBR of Graded Crushed Stone of Flexible Base Structural Layer Based on Discrete Element Model".MATERIALS 16.1(2023).