[1]蒋应军,李思超,王天林.级配碎石动三轴试验的数值模拟方法[J].东南大学学报(自然科学版),2013,43(3):604-609.[doi:10.3969/j.issn.1001-0505.2013.03.029]
 Jiang Yingjun,Li Sichao,Wang Tianlin.Numerical method of dynamic triaxial test on graded crushed rock[J].Journal of Southeast University (Natural Science Edition),2013,43(3):604-609.[doi:10.3969/j.issn.1001-0505.2013.03.029]
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级配碎石动三轴试验的数值模拟方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第3期
页码:
604-609
栏目:
交通运输工程
出版日期:
2013-05-20

文章信息/Info

Title:
Numerical method of dynamic triaxial test on graded crushed rock
作者:
蒋应军1李思超1王天林2
1长安大学特殊地区公路工程教育部重点实验室, 西安710064; 2陕西省交通建设集团, 西安710075
Author(s):
Jiang Yingjun1 Li Sichao1 Wang Tianlin2
1Key Laboratory for Special Area Highway Engineering of Ministry of Education, Changan University, Xian 710064, China
2Shanxi Provincial Communication Construction Group, Xian 710075, China
关键词:
道路工程 级配碎石 动三轴试验 数值模拟 微力学参数
Keywords:
road engineering graded crushed rock dynamic triaxial test numerical simulation micro mechanical parameters
分类号:
U414
DOI:
10.3969/j.issn.1001-0505.2013.03.029
摘要:
为了高效、深入地研究级配碎石材料动态特性,开发了级配碎石动三轴试验的数值模拟方法.基于PFC2D构建了级配碎石动三轴试验的数值模型,通过数值模拟分析了试验条件和微力学参数对模拟结果的影响规律,提出了模拟方法的试验条件及其微力学参数标定方法.结果表明:当试件高度大于40 cm、直径大于20 cm时,试件尺寸对其轴向应变模拟值影响甚微,建议模拟试件尺寸为φ20 cm×40 cm;结合汽车荷载对路面作用规律,确定动载作用和作用间隔时间分别为0.2和1.8 s;失稳偏应力随围压增大而增大,轴向应变随法向刚度、切向刚度和摩擦系数的增大而减小;轴向应变与动载作用次数曲线的模拟结果与室内实测结果基本吻合,证明模拟方法是可靠的.
Abstract:
In order to efficiently and deeply study the dynamic characteristics of graded crushed stone material, a numerical simulation method of dynamic triaxial test is developed. The numerical model of dynamic triaxial test of graded crushed rock is established based on PFC2D. The effects of test conditions and micro mechanical parameters on numerical simulation results are analyzed by numerical simulation, and the test condition and micro mechanical parameters calibration method are proposed. The results show that the size of the specimen has slight influence on the simulated value of axial strain when specimen height is greater than 40 cm and diameter is greater than 20 cm, so a specimen size of φ20 cm×40 cm is suggested. Combined with the effect of vehicle load on pavement, the action time and interval time of dynamic load are determined to be 0.2 and 1.8 s. Unstable deviatoric stress increases with the increase in confining pressure, and simulated axial strain decreases with the increase in normal stiffness, shear stiffness and friction coefficient. Numerical simulation results of the curves of axial strain vs. number of dynamic load action are consistent with laboratory results, which proves the reliability of the numerical simulation test.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 蒋应军(1975—),男,博士,教授,jyj@gl.chd.edu.cn.
基金项目: 浙江省交通运输厅科研计划资助项目(2013H14)、中央高校基本科研业务费专项资金资助项目(CHD2012JC054).
引文格式: 蒋应军,李思超,王天林.级配碎石动三轴试验的数值模拟方法[J].东南大学学报:自然科学版,2013,43(3):604-609. [doi:10.3969/j.issn.1001-0505.2013.03.029]
更新日期/Last Update: 2013-05-20