顆粒外形對顆粒體在滑坡道流動行為之影響及內部性質之探討

以作者查詢圖書館館藏

、以作者查詢臺灣博碩士

、以作者查詢全國書目

、勘誤回報

、線上人數：38

、訪客IP：3.133.155.235

姓名

林昊勳(Hao-Hsun Lin) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

顆粒外形對顆粒體在滑坡道流動行為之影響及內部性質之探討

相關論文

★ 顆粒形狀對顆粒體在旋轉鼓內流動行為之影響	★ 圓片顆粒體在振動床迴流現象之研究-電腦模擬與實驗之驗證
★ 水中顆粒體崩塌分析與電腦模擬比對	★ 以離散元素法探討具有傾斜開槽之晶體結構在單軸拉力作用下的裂縫生成與傳播行為
★ 可破裂顆粒在單向度壓力及膨脹收縮之力學行為	★ 掉落體衝擊顆粒床之力學與運動行為的研究 : DEM的實驗驗證及內部性質探討
★ 掉落體衝擊不同材質與形狀顆粒床之運動及力學行為	★ 顆粒體在具阻礙物滑道中流動行為研究：DEM的實驗驗證及傳輸性質與內部性質探討
★ 以物理實驗探討顆粒形狀對顆粒體在振動床中傳輸性質的影響	★ 以物理實驗探討顆粒形狀對顆粒體在旋轉鼓中傳輸性質的影響
★ 一般顆粒體與可破裂顆粒體在單向度束制壓縮作用下之力學行為	★ 以二相流離散元素電腦模擬與物理實驗探討液體中顆粒體崩塌行為
★ 振動床內顆粒體迴流機制的微觀探索與顆粒形狀效應	★ 非球形顆粒體在剪力槽中的流動行為追蹤與分析
★ 以有限元素法模擬單向度束制壓縮下顆粒體與容器壁間的互制行為及摩擦效應的影響	★ 以離散元素法分析苗栗縣南庄鄉鹿湖山區之土石崩塌行為及內部性質之探討

檔案

[Endnote RIS 格式]

[Bibtex 格式]

[相關文章]

[文章引用]

[完整記錄]

[館藏目錄]

至系統瀏覽論文 (2024-12-1以後開放)

摘要(中)

本研究使用離散元素法(Discrete Element Method, DEM)模擬三種質量相同但形狀不同(球形、雙球形及三球形)的顆粒體於一傾斜滑坡道自由崩塌之流動行為，並探討顆粒形狀對流動行為的影響，觀察三種顆粒體在滑動及沉積靜止時的外觀及其對應的物理性質。研究結果顯示球形顆粒體堆積高度較低且沉積的範圍較為廣泛，雙球形及三球形顆粒體堆積高度較高且較集中，顆粒間互鎖效應(interlocking effect)的強度依次為: 三球形顆粒體>雙球形顆粒體>>球形顆粒體。球形顆粒體在運動中易於滾動，整體運動速度較快，碰撞耗能比例較另外兩者更高，雙球形及三球形顆粒體外形較易互鎖，由摩擦主控著耗能及運動行為。雙球形及三球形顆粒體在運動過程中粒子體積佔有率及平均配位數較球形顆粒體大，而在沉積靜止時則是球形顆粒體較大。球形顆粒體在運動中的平均接觸力最大，而在沉積靜止時則為最小。研究結果進一步顯示顆粒體在運動過程中並非全然是滑動摩擦，同時也存在滾動摩擦。雙球形及三球形顆粒體接近滑動摩擦的比例皆較球形顆粒體高，數值最高的情況發生在三球形顆粒體中顆粒與牆壁的接觸，但也僅佔據約整體的70%。

摘要(英)

The aim of this study is to investigate the gravity-driven free surface flow of granular avalanches over complex basal topography by using Discrete Element Method (DEM). Three different kinds of particle shape are used in the study, that is, spherical, double-spherical and triple-spherical. The influence of particle shape on the flow behavior is explored. Numerical results show that the particle interlocking effect follows the sequence: triple-spherical > double-spherical >> spherical. The spherical granules show a low packing height and a wide range of deposition, while the double-spherical and triple-spherical granules show a high packing height and a narrow range of deposition. The spherical granules intend to rotate during avalanche, move faster, and exhibit higher energy consumption from collision mechanism. The double-spherical and triple-spherical granules are easier to interlock, and the energy dissipation is mainly dominated by friction. The double-spherical and triple-spherical granules show higher solid fraction and coordination number during avalanche, while the spherical granules show more densely packed configuration at settlement. Not only sliding friction but also rolling friction occurs during avalanche. The percentage close to sliding friction of the double-spherical and triple-spherical granules is larger than that of spherical granules. Only 70% of particle-wall contacts in triple-spherical granules, the highest percentage, can attain sliding friction.

關鍵字(中)

★ 離散元素法
★ 顆粒體崩塌
★ 傳輸性質
★ 內部性質
★ 摩擦啟動因子

關鍵字(英)

論文目次

摘要 i
Abstract ii
目錄 iii
附表目錄 v
附圖目錄 vi
第一章緒論 1
1-1 顆粒體的崩塌 1
1-2 顆粒體的崩塌實驗與模擬 1
1-3 崩塌過程的內部性質 4
1-4 研究動機 6
1-5 研究項目 6
第二章研究方法 7
2-1 離散元素法 7
2-1-1 離散元素法之架構 7
2-1-2 三維剛體的運動方程式 7
2-1-3 接觸力模型 9
2-1-4 計算時間步 10
2-2 傳輸性質計算 10
2-2-1 能量計算 10
2-2-2 擾動速度 12
2-2-3 粒子溫度 13
2-3 內部性質計算 13
2-3-1 顆粒粒子體積佔有率 13
2-3-2 平均配位數 14
2-3-3 平均接觸力 14
2-4 摩擦啟動因子計算 14
2-4-1 摩擦啟動因子 14
2-5 離散元素模型 15
2-5-1 模型設立 15
2-5-2 顆粒體的自然沉積 16
2-5-3 顆粒體的崩塌滑動 16
第三章結果與討論 17
3-1 顆粒體形狀對流動形態之影響 17
3-2 顆粒體形狀對傳輸性質之影響 18
3-3 顆粒體形狀對內部性質之影響 21
3-4 顆粒體形狀對摩擦啟動因子之影響 24
第四章結論 28
參考文獻 30

參考文獻

[1] P. A. Cundall, O. D. L. Strack, A discrete numerical model for granular assemblies, Geotechnique 29 (1979), 47-65
[2] J. M. N. T. Gray, M. Wieland, K. Hutter, Gravity-driven free surface flow of granular avalanches over complex basal topography, Proc. R. Soc. 11 (1999), 1841-1874
[3] M. Wieland, J. M. N. T. Gray, K. Hutter, Channelized free-surface flow of cohesionless granular avalanches in a chute with shallow lateral curvature, J. Fluid Mech. 392 (1999), 73-100
[4] P. Mills, D. Loggia, M. Tixier, Model for a stationary dense granular flow along an inclined wall, Europhys. Lett. 45 (1999), 733-738
[5] T. Faug, I. Einav, P. Childs, E. Wyburn, Diffuse and steep jumps in steady-state granular flows, ACMSM 23 (2014), 769-774
[6] R. Valentino, G. Barla, L. Montrasio, Experimental Analysis and Micromechanical Modelling of Dry Granular Flow and Impacts in Laboratory Flume Tests, Rock Mech. Rock Engng. 41 (2008), 153-177
[7] L. E. Silbert, J. W. Landry, G. S. Grest, Granular flow down a rough inclined plane: Transition between thin and thick piles, Phys. Fluids 15 (2003), 1-10
[8] C. Y. Lo, M. D. Bolton, Y. P. Cheng, Velocity fields of granular flows down a rough incline: a DEM investigation, Granul. Matter 12 (2010), 477-482
[9] L. E. Silbert, D. Ertas, G. S. Grest, T. C. Halsey, D. Levine, S. J. Plimpton, Granular flow down an inclined plane: Bagnold scaling and rheology, Phys. Rev. E 64 (2001), 051302
[10] M. Sadjadpour, C. S. Campbell, Granular chute flow regimes: mass flowrates, flowrate limits and clogging, Advanced Powder Technol. 10 (1999), 175-185
[11] D. Takagi, J. N. McElwaine, H. E. Huppert, Shallow granular flows, Phys. Rev. E 83 (2011), 031306
[12] Y. C. Chung, C. W. Wu, C. Y. Kuo, S. S. Hsiau, A rapid granular chute avalanche impinging on a small fixed obstacle: DEM modeling, experimental validation and exploration of granular stress, Appl. Math. Model. 74 (2019), 540-568
[13] H. Teufelsbauer, Y. Wang, S. P. Pudasaini, R. I. Borja, W. Wu, DEM simulation of impact force exerted by granular flow on rigid structures, Acta. Geotech. 6 (2011), 119-133
[14] A. Albaba, S. Lambert, F. Nicot, B. Chareyre, Relation between microstructure and loading applied by a granular flow to a rigid wall using DEM modeling, Granul. Matter 17 (2015), 603-616
[15] H. Teufelsbauer, Y. Wang, and M. C. Chiou, Flow-obstacle interaction in rapid granular avalanches: DEM simulation and comparison with experiment, Granul. Matter 11 (2009), 209-220
[16] P. W. Cleary, DEM prediction of industrial and geophysical particle flows, Particuology 8 (2010), 106-118
[17] Y. Guo, J. S. Curtis, Discrete Element Method Simulations for Complex Granular Flows, Annu. Rev. Fluid Mech. 47 (2015), 21-46
[18] C. Salot, P. Gotteland, P. Villard, Influence of relative density on granular materials behavior: DEM simulations of triaxial tests, Granul. Matter 11 (2009), 221-236
[19] Y. Li, Y. Xu, S. Jiang, DEM simulations and experiments of pebble flow with monosized spheres, Powder Technol. 193 (2009), 312-318
[20] R. M. Yuan, C. L. Tang, J. C. Hu, X. W. Xu, Mechanism of the Donghekou landslide triggered by the 2008 Wenchuan earthquake revealed by discrete element modeling, Nat. Hazards Earth Syst. Sci. 14 (2014), 1195-1205
[21] C. M. Lo, M. L. Lin, C. L. Tang, J. C. Hu, A kinematic model of the Hsiaolin landslide calibrated to the morphology of the landslide deposit, Eng. Geol. 123 (2011), 22-39
[22] R. Poisel, A. Preh, 3D landslide run out modelling using the Particle Flow Code PFC3D, Landslides and Engineered Slopes. From the Past to the Future (2008), 873-879
[23] S. Ji, H. H. Shen, Effect of Contact Force Models on Granular Flow Dynamics, J. Eng. Mech. 132 (2006), 1252-1259
[24] G. G. D. Zhou, Q. C. Sun, Three-dimensional numerical study on flow regimes of dry granular flows by DEM, Powder Technol. 239 (2013), 115-127
[25] C. S. Campbell, C. E. Brennen, Chute flows of granular material: some computer simulations, J. Appl. Mech. 52 (1985), 172-178
[26] 林沐禾, 掉落體衝擊顆粒床之力學與運動行為的研究 : DEM的實驗驗證及內部性質探討, 國立中央大學碩士論文 (2016)
[27] Y. Tsuji, T. Tanaka, T. Ishida, Lagrangian numerical-simulation of plug flow of cohesionless particles in a horizontal pipe, Powder Technol. 71 (1992), 239-250
[28] Y. C. Chung, C. K. Lin, J. Ai, Mechanical behaviour of a granular solid and its contacting deformable structure under uni-axial compression-Part II: Multi-scale exploration of internal physical properties, Chem. Eng. Sci. 144 (2016), 421-443

指導教授

鍾雲吉

審核日期

2019-11-8

推文