红砂岩粗粒土动力试验及颗粒破碎模型研究

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摘要铁路路基建设需要经过泛红砂岩地区，红砂岩路基的稳定性对列车安全起到至关重要的作用。为研究列车荷载对红砂岩粗粒土动力特性以及颗粒破碎的影响，采用室内大型动静三轴试验系统，开展动力荷载下的红砂岩试样动力响应测试,分析了粒径大小、加载次数对轴向应变、动力软化以及颗粒破碎的影响。根据动力破碎三轴试验结果，构建了动力作用下的颗粒破碎模型，并对模型进行了验证。研究结果表明：加载次数一定的条件下，颗粒粒径越大对应的轴向应变越大；颗粒粒径越小，越早完成颗粒破碎及土体结构调整。粗粒土软化曲线呈半对数关系，颗粒粒径越大，软化系数越小。动力荷载下，大粒径颗粒主要演化为下一级粒径颗粒和细小粒径颗粒，破碎形式为研磨，存在一个极限破碎级配。根据动力破碎试验建立了动力破碎的概率密度函数f，构建了动力条件下的颗粒破碎模型。该模型能够较好的模拟动力作用下的颗粒破碎过程。Marsal颗粒破碎率Br与颗粒破碎模型中的死亡率Ps-t呈线性关系。研究结果能为铁路路基工程相关设计提供一定的理论参考价值。

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	龙尧1
	张同文1
	张家生2
	肖源杰2

关键词 ：红砂岩, 粗粒土, 铁路工程, 动力试验, 颗粒破碎模型

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

收稿日期: 2022-05-19 出版日期: 2023-02-15

引用本文:

龙尧1，张同文1，张家生2，肖源杰2. 红砂岩粗粒土动力试验及颗粒破碎模型研究[J]. 振动与冲击, 2023, 42(3): 270-279.
LONG Yao1, ZHANG Tongwen1, ZHANG Jiasheng2, XIAO Yuanjie2. Dynamic tests and particle breakage model of red sandstone coarse grained soil. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(3): 270-279.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I3/270

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