PFC3D颗粒流模拟纳米黏土改良黄土三轴试验
摘要:基于PFC3D软件研究不同纳米材料、掺量、围压、干密度对改良黄土力学性能的影响，确定改良黄土宏细观之间的参数关系，通过建立改良黄土数值模型、三轴试验，获得了改良黄土的应力–应变曲线。将数值模拟的结果与室内试验的结果相比较，通过数值模拟和室内三轴试验，得出的改良黄土抗剪强度指标基本吻合。试验结果表明：（1）围压一定时，改良黄土试样偏应力随纳米黏土掺量的增加而增大；改良黄土的应力与应变正相关，不同围压时，表现为软化型和强硬化型；（2）当凹凸棒土掺量小于2%时，数值模拟得到的抗剪强度总体小于室内试验得到的抗剪强度，材料大于2%时则相反；（3）纳米蒙脱土改良黄土数值试样材料掺量小于等于4%时，数值模拟得到的抗剪强度大于室内试验的抗剪强度，大于4%则相反。
Abstract:PFC3D software was used to study the influence of different nanomaterials, dosage, confining pressure, and dry density on the mechanical properties of improved loess, and determine the parameter relationship between macro and meso of improved loess. Through a numerical model of improved loess and a three-axis experiment, the stress-strain curve of improved loess was obtained. The results of the numerical simulation were compared with the results of indoor experiments, and the shear strength index of improved loess was consistent. The experimental results showed that: (1) When the confining pressure is constant, the deviatoric stress of the improved loess sample increases with the increase of nano-clay content. The stress and strain of the improved loess are positively correlated. When the confining pressure is different, it shows a softening type and a strong hardening type. (2) When the content of attapulgite is less than 2%, the shear strength obtained by numerical simulation is generally lower than that derived from laboratory tests; conversely, when the content exceeds 2%, the situation is reversed. (3) When the content of nano-montmorillonite modified loess in numerical test samples is less than or equal to 4%, the shear strength obtained through numerical simulation is higher than that measured in laboratory tests; conversely, when the content exceeds 4%, the situation is reversed.
中文标题：
PFC3D颗粒流模拟纳米黏土改良黄土三轴试验
PFC3D Particle Flow Simulation of Nano-Clay Modified Loess Triaxial Test
作者：
张子萱1,,曹宝花1, 2,韩泽敏1,许江波1,,,程芳卉3,陈绍华3,侯鑫敏1, 3,詹皓辰3
Zhang Zixuan1,,Cao Baohua1, 2,Han Zemin1,Xu Jiangbo1,,,Cheng Fanghui3,Chen Shaohua3,Hou Xinmin1, 3,Zhan Haochen3
作者简介:张子萱，女，1999年生，汉族，天津人，在读硕士研究生，主要从事岩土工程方面研究。E-mail：zzx_999_tj@163.com通讯作者:许江波，男，1985年生，汉族，河南林州人，博士，副教授，主要从事岩土工程方面研究。E-mail：xujiangbo@yeah.net
通讯地址：
1.长安大学公路学院，陕西西安 710064 2.西安长大公路工程检测有限公司，陕西西安 710064 3.中铁第一勘察设计院集团有限公司，陕西西安 710043
1.HighwaySchool,Chang’anUniversity,Xi’an710064,Shaanxi,China 2.Xi’anChangdaHighwayEngineeringInspectionCenterCo.,Ltd.,Xi’an710064,Shaanxi,China 3.ChinaRailwayFirstSurveyandDesignInstituteGroupCo.,Ltd.,Xi’an710043,Shaanxi,China
中图分类号:TU411
doi:10.3969/j.issn.1007-2993.2024.03.016
出版物：岩土工程技术
收稿日期:2023-08-21
修回日期:2023-11-08
录用日期:2024-03-11
刊出日期:2024-06-12
关键词:凹凸棒土,纳米蒙脱土,改良黄土,三轴试验,PFC3D颗粒流模拟试验
Key words:attapulgite,nano-montmorillonite,improved loess,triaxial test,PFC3D particle flow simulation test
文档包含图片数量：图片(13)张
文档包含表格数量：表格(5)个
参考文献：
[1]周 健, 池毓蔚, 池 永, 等. 砂土双轴试验的颗粒流模拟[J]. 岩土工程学报,2000(6):701-704.
[2]刘文白, 周 健. 扩底桩的上拔试验及其颗粒流数值模拟[J]. 岩土力学,2004(S2):201-206.
[3]苑伟娜, 范 文, 邓龙胜, 等. 黄土颗粒结构特征及其对剪切行为的影响[J]. 工程地质学报,2021,29(3):871-878.
[4]王 颖, 庄建琦, 李 威, 等. 地震作用下黄土斜坡失稳及运动过程的离散元模拟[J]. 工程地质学报,2018,26(5):1139-1154.
[5]同 霄, 朱兴华, 马鹏辉, 等. 颗粒离散元方法中黄土强度参数研究[J]. 地下空间与工程学报,2019,15(2):435-442.
[6]李 涛, 蒋明镜, 张 鹏. 非饱和结构性黄土侧限压缩和湿陷试验三维离散元分析[J]. 岩土工程学报,2018,40(S1):39-44.
[7]蒋明镜, 胡海军, 李 涛. 非饱和结构性黄土双轴湿陷试验的离散元分析[J]. 地下空间与工程学报,2016,12(4):1110-1116.
[8]周 杰. 模型维数对岩土离散元试验影响的宏–微观研究[J]. 地下空间与工程学报,2015,11(1):84-88,97.
[9]周 剑, 张路青, 戴福初, 等. 基于黏结颗粒模型某滑坡土石混合体直剪试验数值模拟[J]. 岩石力学与工程学报,2013,32(S1):2650-2659.
[10]周 喻, MISRA A, 吴顺川, 等. 岩石节理直剪试验颗粒流宏细观分析[J]. 岩石力学与工程学报,2012,31(6):1245-1256. doi: 10.3969/j.issn.1000-6915.2012.06.021
[11]YOU Z, ZHANG M, LIU F, et al. Numerical investigation of the tensile strength of loess using discrete element method[J]. Engineering Fracture Mechanics, 2021, 247:107610.
[12]SUENG WON J, KABUYAYA K, DONG EUN L, et al. Numerical analysis of shear and particle crushing characteristics in ring shear system using the PFC2D[J]. Materials,2021,14(1):229. doi: 10.3390/ma14010229
[13]JIANG M, LI T, HU H, et al. DEM analyses of one-dimensional compression and collapse behaviour of unsaturated structural loess[J]. Computers and Geotechnics,2014,60:47-60. doi: 10.1016/j.compgeo.2014.04.002
[14]PARK J, SONG J. Numerical simulation of a direct shear test on a rock joint using a bonded-particle model[J]. International Journal of Rock Mechanics and Mining Sciences,2009,46(8):1315-1328. doi: 10.1016/j.ijrmms.2009.03.007
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