粒径大小对颗粒堆积体Burgers模型蠕变参数相似试验研究  

Similar experimental study on the effect of particle size on the creep parameters of Burgers model of granular accumulation

作　　者：马志奇 杨小彬[1] 刘腾辉 李志辉 Ma Zhiqi;Yang Xiaobin;Liu Tenghui;Li Zhihui(School of Emergency Management and Safety Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)应急管理与安全学院,北京100083

出　　处：《矿业科学学报》2022年第6期730-737,共8页Journal of Mining Science and Technology

基　　金：国家自然科学基金(51274207)。

摘　　要：为研究砂土颗粒材料堆积体在沉降过程中的变形行为,采用分级加载的方式进行三轴压缩蠕变试验,获得3组不同粒径(0.6~0.8 mm、1.0~1.5 mm、2.0~2.5 mm)的玻璃微珠蠕变变形-时间曲线,选取四元件Burgers模型对试验曲线进行拟合分析,得到玻璃微珠蠕变特性表征参数,并建立离散元数值模型对burgers模型参数进行验证。研究结果表明:玻璃微珠在三轴压缩条件下的蠕变特性可采用Burgers模型进行描述,蠕变Burgers模型的4个参数E_(k)、E_(m)、η_(k)、η_(m)与粒径和轴压均呈现负相关关系。将试验拟合得到的宏观Burgers模型参数转换为颗粒流程序中的微观Burgers模型参数,模拟结果与试验结果具有较高的吻合性,对比结果说明颗粒流Burgers模型适用于岩石颗粒蠕变试验的研究。In order to study the deformation behavior of sand granular material accumulation during settlement,this study carried out the triaxial compression creep test by step loading,and obtained three groups of creep deformation-time curves of glass beads with different particle sizes(0.6~0.8 mm,1.0~1.5 mm,2.0~2.5 mm).The four element Burgers model was selected to fit and analyze the test curve,from which the parameters of creep characterization of glass beads were obtained.The discrete element numerical model was established to verify the parameters of the Burgers model.Results show that the creep characteristics of glass beads under triaxial compression can be described by the Burgers model.The four parameters E_(k)、E_(m)、η_(k)、η_(m)of the Burgers model have negative correlation with particle size and axial pressure.The macro Burgers model parameters obtained from the test are transformed into the micro Burgers model parameters in the particle flow program.The simulation results are in good agreement with the test results.The comparison results verify that the particle flow Burgers model is suitable for the experimental study of rock particle creep.

关 键 词：颗粒堆积体 蠕变 Burgers四元件模型 离散元 

分 类 号：TU454[建筑科学—岩土工程]