| 马石城,胡军霞,马一跃,董辉.基于三维离散元堆积碎石土细-宏观力学参数相关性研究[J].计算力学学报,2016,33(1):73~82 |
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| 基于三维离散元堆积碎石土细-宏观力学参数相关性研究 |
| Research on mesoscopic-macroscopic mechanical parameters correlation of accumulation of gravel soil based on three dimensional discrete element |
| 投稿时间：2014-10-08 修订日期：2014-12-11 |
| DOI：10.7511/jslx201601012 |
| 中文关键词: 堆积碎石土 细观参数 粘聚力 内摩擦角 离散元 |
| 英文关键词:accumulation of gravel soil micro parameters cohesive force internal friction angle discrete element |
| 基金项目:国家自然科学基金(51108397)资助项目. |
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| 中文摘要: |
| 以室内三轴压缩试验为基础,运用PFC3D离散元软件生成含有不同形状碎石块的1:1堆积碎石土数值模型,标定得到相应的细观参数(相对误差控制在10%以内)。改变细观参数,定量探讨其与宏观力学参数(粘聚力和内摩擦角)关系,得到细观参数与粘聚力、内摩擦角的细-宏观参数关系式,并对其可靠性进行了验证。研究发现,(1) 粘聚力与接触粘结力、颗粒摩擦系数呈线性正相关;同时受粘结力比值M=σc/τc的影响,当M<1时,粘聚力随着M的增加而线性增加;M≥4时,粘聚力趋于稳定。(2) 内摩擦角与颗粒摩擦系数呈对数关系,与接触粘结力呈抛物线关系。(3) 细-宏观参数关系式是在含水率为7%室内试验结果基础上研究得出,将关系式运用到含水率为9%和11%的室内试验结果进行标定验证:依据含水率为9%和11%室内试验得到的c和φ值,运用细-宏观参数关系式计算得到细观参数,经验证其数值-室内试验结果相对误差在10%以内,说明通过细-宏观力学关系式得到的细观参数符合精度要求,关系式可靠。为后续土石混合体数值试验研究者进行细观参数标定工作提供了参考依据。 |
| 英文摘要: |
| Based on indoor triaxial compression test, using the discrete element software PFC3D generated 1:1 accumulation of gravel soil numerical model, which has different shape stone and its corresponding micro parameters is obtained by calibration (relative error control within 10%).Changing micro parameters had been discussed quantitatively its relationship with macroscopic mechanical parameters (cohesive force and internal friction angle), got more mesoscopic parameters and the cohesive force, internal friction angle equation, furthermore its reliability had been verified.The study found (1)The relationship of cohesive force with contact cohesive force, grain friction coefficient was of linear regression; At the same time, influenced by bond ratio M=σc/τc also, when M<1, the cohesive force of linear increase with the increase of M, and when M≥4, cohesive force to be stabilize.(2)The relationship between internal friction angle and friction coefficient of particles is logarithmic, and parabola relationship to the contact adhesive power.(3)According to the c, φ gotted by indoor test with moisture content of 9% and 11%, used the micro-macro parameter equation to calculate the micro parameters.And its virtual-indoor test results of relative error was within 10%.Fine-macro mechanics equation were reliable, and it can provide the reference to subsequent soil-rock-mixture micro parameters calibration of virtual experiment. |
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