Numerical simulation of two-dimensional particle flow in broken rockfill materials
-
摘要: 堆石料在外力作用下极易发生破碎,基于单颗粒破碎机制,依靠生成的颗粒簇单元克服刚性圆形颗粒模拟堆石料颗粒不能破碎的缺陷,采用线性接触模型建立堆石料颗粒破碎的数值模型。模拟室内平面应变试验,分析堆石料在整个加载过程中内部接触力、微裂纹和各种能量的变化,探讨堆石料颗粒破碎的内在机制。研究表明：颗粒簇生成的数值试样通过内部黏结力断裂更能真实反映堆石料颗粒破碎;堆石料颗粒破碎首先发生在大粒径和接触力较大的颗粒,并逐步向最大压应力方向发展,最终试件内部产生剪切破裂滑动面;在整个加载过程中,堆石料的剪切微裂纹数大于拉伸微裂纹数,颗粒破碎主要以剪切破坏为主,峰值点附件产生大量颗粒破碎;小变形情况下,总输入能以弹性应变能的形式储存在颗粒簇内部颗粒间接触,大变形情况下,弹性应变能以储存-释放的形式转换其他形式耗能,并导致其他形式耗能增加。研究成果可为研究堆石坝体变形提供参考。Abstract: Rockfill materials are easily broken under external force. Based on the single particle crushing mechanism, the indestructible defect is simulated in particle of rockfill materials depending on the generated particles cluster units to overcome rigid circular particle. A broken numerical model for particle of rockfill materials is established by adopting the linear contact model. Indoor plane strain tests are simulated. The internal contact force, micro crack and a variety of energy changes in rockfill materials are analyzed under the loading process. The breakage mechanism for particle of rockfill materials is investigated. The results show that the numerical sample generated by particle clusters can more truly reflect the breakage of particle of rockfill materials through the internal bond strength fracture. The breakage of particle of rockfill materials occurs first in the large particle size and contact force larger particles, then gradually to direction of the maximum pressure, finally shear fracture sliding plane is generated. The number of shear micro crack is greater than that of tensile micro crack throughout the whole loading process, the particle breakage mainly is shear failure, and a lot of particle breakage is produced near the peak point. The total input energy stores in particle cluster in the form of elastic strain energy under small deformation. The elastic strain energy can be converted to other forms of energy dissipation in the form of storage release under large deformation. The research results can provide reference for the study on the deformation of rockfill dams.
-
Keywords:
- rockfill /
- particle breakage /
- particle cluster /
- numerical simulation
-
[1] LADE P V, YAMAMURO J A, BOPP P A. Significance of particle crushing in granular materials[J]. Journal of Geotechnical Engineering, 1996, 122(4): 309-316. [2] 刘 尧, 卢延浩. 粗粒土大型单剪颗粒破碎试验研究[J]. 河海大学学报(自然科学版), 2009, 37(2): 175-178. (LIU Yao, LU Yan-hao. Large-scale simple shear tests of particle breakage of coarse-grained soil[J]. Journal of Ho-hai University (Natural Sciences), 2009, 37(2): 175-178. (in Chinese)) [3] HARDIN B O. Crushing of soil particle[J]. Journal of Geotechnical Engineering, 1985, 111(10): 1177-1192. [4] 孔宪京, 刘京茂, 邹德高, 等. 紫坪铺面板坝堆石料颗粒破碎试验研究[J]. 岩土力学, 2014, 35(1): 35-40. (KONG Xian-jing, LIU Jing-mao, ZOU De-gao, et al. Experimental study of particle breakage of Zipingpu rockfill material[J]. Rock and Soil Mechanics, 2014, 35(1): 35-40. (in Chinese)) [5] 陈生水, 韩华强, 傅 华. 循环荷载下堆石料应力变形特性研究[J]. 岩土工程学报, 2010, 32(8): 1151-1157. (CHEN Sheng-shui, HAN Hua-qiang, FU Hua. Stress and deformation behaviors of rockfill under cyclic loadings[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(8): 1151-1157. (in Chinese)) [6] CHENG Y P, BOLTON M D and NAKATA Y. Crushing and plastic deformation of soils simulated using DEM[J]. GEOTECHNIQUE, 2004, 54(2): 131-141. [7] 邵 磊, 迟世春, 张 勇, 等. 基于颗粒流的堆石料三轴剪切试验研究[J]. 岩土力学, 2013, 34(3): 711-720.(SHAO Lei, CHI Shi-chun, ZHANG Yong, et al. Study of triaxial shear tests for rockfill based on particle flow code[J]. Rock and Soil Mechanics, 2013, 34(3): 711-720. (in Chinese)) [8] 马 刚, 周 伟, 常晓林, 等. 堆石体三轴剪切试验的三维细观数值模拟[J]. 岩土工程学报, 2011, 33(5): 746-753. (MA Gang, ZHOU Wei, CHANG Xiao-lin, et al. 3D mesoscopic numerical simulation of triaxial shear tests for rockfill[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(5): 746-753. (in Chinese)) [9] 杨 贵, 许建宝, 刘昆林. 粗粒料颗粒破碎数值模拟研究[J]. 岩土力学. 2015, 36(11): 3301-3306. (YANG Gui, XU Jian-bao, LIU Kun-lin. Numerical simulation of particle breakage of coarse aggregates[J]. Rock and Soil Mechanics, 2015, 36(11): 3301-3306. (in Chinese)) [10] OLIVIER T D V, JEAN-CLAUDE C. Numerical model of crushing of grains inside two-dimensional granular materials[J]. Powder Technology, 1999(105): 190-198. [11] BEN-NUM O, EINAV I. The role of self-organization during confined comminution of granular materials[J]. Philosophical Transactions of the Royal Society A, 2010, 36(8): 231-247. [12] ZHOU Wei, YANG Li-fu, MA Gang, et al. Macro-micro responses of crushable granular materials in simulated true triaxialtests[J]. Granular Matter. 2015, 17(4): 497-509. [13] MARSAL R J. Mechanical properties of rockfill[M]. New York: Wiley, 1973: 109-200. [14] 宿 辉, 党承华, 李彦军, 等. 考虑不均质度的岩石声发射数值模拟研究[J]. 岩土力学, 2011, 32(6): 1886-1890. (SU Hui, DANG Cheng-hua, LI Yan-jun, et al. Study of numerical simulation of acoustic emission in rock of inhomogeneity[J]. Rock and Soil Mechanics, 2011, 32(6): 1886-1157. (in Chinese)) -
期刊类型引用(4)
1. 徐宇冉，蒋函静. 考虑颗粒破碎的粗粒土一维压缩试验及数值模拟. 地下空间与工程学报. 2025(02): 452-460 . 
百度学术
2. 闫世豪，迟世春，王晋伟，郭宇，周新杰. 考虑微裂纹随机分布的堆石颗粒准静态强度统计模型. 岩土力学. 2024(05): 1378-1387 . 百度学术
3. 曹志刚，申昆鹏，毛天学，肖力，庄峻淇. 淤泥质钻渣土碳化造粒方法及强度增长机理试验. 中国公路学报. 2024(06): 217-227 . 百度学术
4. 赵淑红，张鑫，袁溢文，侯磊涛，杨悦乾. 粉末状有机肥条施排肥器设计与试验. 农业机械学报. 2022(10): 98-107 . 百度学术
其他类型引用(11)
计量
- 文章访问数: 329
- HTML全文浏览量: 6
- PDF下载量: 307
- 被引次数: 15
下载:
