| 碎石土三轴测试仿真建模及试样尺寸效应分析 |
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| 引用本文： | 董辉,罗潇,罗正东,王智超.碎石土三轴测试仿真建模及试样尺寸效应分析[J].地质力学学报,2016,22(1):104-113. |
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| 作者姓名： | 董辉 罗潇 罗正东 王智超 |
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| 作者单位： | 湘潭大学土木工程与力学学院, 湖南 湘潭 411105;成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059;成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059;成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059;成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059 |
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| 基金项目： | 国家自然科学基金资助项目(51108397,51308485);湖南省自然科学基金资助项目(2015JJ2136,2015JJ6038) |
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| 摘 要： | 借助离散单元理论与室内三轴试验,分析碎石土物理实验中试样尺寸(直径和高度)变化对应力应变、体应变、粘聚力和内摩擦角等力学性能的尺寸效应影响。研究结果表明,所提出的块体随机生成法则能较好地实现试样中不同形状碎石块的模拟。不同直径和高度的碎石土试样,初始2%应变范围内的应力-应变曲线变化规律基本一致,后部曲线变化较大。直径和高度越小,围压越低,应力软化现象越明显;直径大于250 mm、高度大于350 mm后无应变软化,残余应力恒定。峰值应力随试样直径增大以25%的增长率呈线性增长,随高度的增大呈非线性增长,高度小于200 mm时增长率为11.9%,大于200 mm后为28.9%。体应变破坏峰值则表现为先增大后减小的趋势。同时粘聚力随直径的增大线性增长,内摩擦角则减小,而试件高度的变化对其影响规律则相反。
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| 关 键 词： | 碎石土 三轴仿真 尺寸效应 |
| 收稿时间： | 2015/9/2 0:00:00 |
SIMULATION MODELING AND SAMPLE SIZE EFFECT ANALYSIS FOR GRAVEL SOIL TRIAXIAL TEST |
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| DONG Hui,LUO Xiao,LUO Zheng-dong and WANG Zhi-chao.SIMULATION MODELING AND SAMPLE SIZE EFFECT ANALYSIS FOR GRAVEL SOIL TRIAXIAL TEST[J].Journal of Geomechanics,2016,22(1):104-113. |
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| Authors: | DONG Hui LUO Xiao LUO Zheng-dong and WANG Zhi-chao |
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| Institution: | College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | Based on the size effect in the gravel soil physics experiment, mechanical properties of the stress-strain, the strain, the cohesive force and inner friction angle of gravel soil was analyzed using discrete element theory and indoor triaxial test. The results showed that the proposed block generated law could realize the simulation of the crushed stone much more. The stress strain curves were almost unanimous (2% strain) at different diameter and height, but the rear part of the curve changes greatly, the smaller the diameter and height, the lower confining pressure stress, the more obvious softening phenomenon. The residual stress was constant after diameter 250 mm, height 350 mm. The peak stress increased with a linear growth rate of 25% with the sample diameter, but nonlinear growth along with the increase of height, when less than 200 mm, the high growth rate was 11.9%, and 28.9% after 200 mm. Damage body strain values were first increasing then decreasing, at the same time cohesive force increases of the linear growth with the diameter and in friction angle was reduced, but rule was just the opposite at different height. |
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| Keywords: | gravel soil triaxial simulation size effect |
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