红砂岩粗粒土动力试验及颗粒破碎模型研究

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Abstract Railway subgrade construction needs to pass through the red sandstone area, the stability of red sandstone subgrade plays a vital role in train safety. For the study of train loads of red sandstone coarse grained soil dynamic characteristics and the influence of particle breakage, the dynamic response test of red sandstone samples under dynamic loading was carried out by using a large indoor dynamic and static triaxial test system. And the effects of particle size and loading times on axial strain, dynamic softening and particle breakage were analyzed. According to the results of dynamic crushing triaxial test, a particle breakage model under dynamic action was established and verified. The results show that under certain loading times, the larger the particle size is, the larger the axial strain is. The smaller the particle size is, the sooner the particle crushing and soil structure adjustment can be completed. The softening curve of coarse-grained soil shows a semi-logarithmic relationship, and the softening coefficient decreases with the larger particle size. Under dynamic load, large particle size mainly evolves into lower particle size and the most small particle size. The crushing form is grinding, and there is a limit crushing gradation. According to the dynamic crushing test, the probability density function f of dynamic crushing was established, and the particle crushing model under dynamic conditions was established. The model can well simulate the particle crushing process under dynamic action. There was a linear relationship between Marsal particle breakage rate Br and mortality rate PS-T . The research results can provide some theoretical reference value for the design of railway subgrade engineering.

Key words： Red sandstone Coarse grained soil Rail engineering Dynamic test Particle breakage model

Received: 19 May 2022 Published: 15 February 2023

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	Articles by authors
	LONG Yao1
	ZHANG Tongwen1
	ZHANG Jiasheng2
	XIAO Yuanjie2

Cite this article:

LONG Yao1,ZHANG Tongwen1,ZHANG Jiasheng2, et al. Dynamic tests and particle breakage model of red sandstone coarse grained soil[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(3): 270-279.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I3/270

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