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標題: 圍壓狀態下土壤滲流沖蝕之探討
Study on Seepage Erosion of Soil under Confining Pressure
作者: 陳有臨
Yu-Lin Chen
關鍵字: 滲流沖蝕
Seepage erosion
Drag equation
Failure criterion
引用: 1. Aikhuele, D. O.(2015).'Ball Valves, Issues and Material Selections for Manufacturing' 2. ASTM.(2011).'Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils'.D4767-11, International. 3. ASTM.(2016).'Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter'.D5084-16a, International. 4. ASTM.(2017).'Standard Specification for Standard Sand'.C778-17, International. 5. Berthe, D. , Dowson, D. , Godet, M. , Taylor, C. M.(1987).'Fluid Film Lubrication-Osborne Reynolds Centenary'.Elsevier, 375-386. 6. Chang, D. S. & Zhong, L. M.(2011).'A stress-controlled Erosion Apparatus for Studying Internal Erosion in Soils'.Geotechnical Testing Jounal, Vol. 34, No. 6, 579-589. 7. Chu-Agor, M. L. , Fox G. A. , Cancienne, R. M. , Wilson, G. V.(2008).'Seepage caused tension failures and erosion undercutting of hillslopes'.Journal of Hydrology, 359, 247-259. 8. Crosta, G. & Prisco, C.(1999).'On Slope Instability by Seepage Erosion'.Canadian Geotechnical Journal, 36, 1056-1073. 9. Das, B. M.(2016). Principles of Foundation Engineering'Cengage Learning.47-52. 10. Das, B. M. & Sobhan, K.(2016).'Principles of Soil Geotechnical Engineering'.Cengage Learning, 212-260. 11. Fox, R. W. , Pritchard P. J. , McDonald, A. T.(2014).'Introduction to Fluid Mechanics'. John Wiley & Sons, Inc, 307-347. 12. Hillel, D.(1980).'Fundamentals of Soil Physics'.Academic Press, 166-172. 13. Moffat, R. A. & Fannin, R. J.(2006).'A Large Permeameter for Study of Internal Stability in Cohesionless Soils'.Geotechnical Testing Jounal, Vol. 29, No. 4, 273-279. 14. Munsin, B. R. , Okiishi, T. H. , Huebsch W. W. , Rothmayer, A. P. (2013).'Fluid Mechanics'.John Wiley & Sons Singapore Pte. Ltd. , 344-466. 15. Richards, K. S. & Reddi, K. R.(2014).'Kinetic Energy Method for Predicting Initiation of Backward Erosion in Earthen Dams and Levees'.Environmental & Engineering Geoscience, Vol. XX, No. 1, 85–97. 16. Rochim, A. , Marot; D. , Sibille, L. , Le, V. T.(2017).'Effects of Hydraulic Loading History on Suffusion Susceptibility of Cohesionless Soils'.Journal of Geotechnical Geoenvironmental Engineering, Vol. 143, No. 7, 04017025. 17. Simmons, C. T.(2008).'Henry Darcy(1803–1858):Immortalised by his scientific legacy'.Hydrogeology Journal, 16:1023-1038. 18. Sutera, S. P. & Skalka, R.(1993).'The history of Poiseuille's law'. Annual Review of Fluid Mechanics, 25:1-20 19. U.S. Silica Company.(2017).'ASTM C778 20-30 Standard Silica Product Data'. U.S. Silica Company. 20. 李光敦,(2014),《水文學》,五南圖書出版股份有限公司出版,1-3。 21. 林佳燕、蔡義誌、林俐玲,(2009),「土壤粒徑分析實驗方法之比較」,水土保持學報,第四十一卷,第二期,139-152。 22. 蘇郁婷,(2013),「利用滲透試驗探討雙層土壤之滲流沖蝕行為」,國立臺灣大學工學院土木工程學系碩士論文。
摘要: 土壤滲流為流體介質在土壤孔隙內流動的現象,然而許多邊坡災害的原因,往往跟土壤的滲流行為有關,人為的因素也有可能造成類似的災害發生,舉例來說,農田的灌溉以及水工構造物導致原本穩定的邊坡因為水流入滲量增加而產生漸進式的侵蝕破壞後而崩塌。 本研究採用傳統三軸實驗儀器的水箱進行儀器設計,主要探討砂土在不同的水流流速下造成滲流沖蝕破壞的臨界滲流流速,而為模擬較深層邊坡透水層中的重要條件,本實驗設計一組可以在土壤試體外部加上圍壓的儀器,進一步的瞭解圍壓對於土壤滲流造成的影響,接著利用流體動力學中的阻力方程式作為理論基礎,制定一套關於土壤滲流的破壞準則,期望將來可應用於現地滲流狀況的分析。 本實驗使用材質相同粒徑不同的石英砂,而由阻力方程式所推導出來的滲流破壞準則顯示臨界破壞流速受到了顆粒大小、孔隙率、圍壓、破壞區域以及摩擦角的影響,而實驗結果呈現出顆粒粒徑的大小以及圍壓會明顯影響試體的臨界破壞流速。
Soil seepage is the phenomenon that fluid medium flows in the porosity of soil. However, the causes of many slope disasters are often related to the seepage behavior of soil. Human factors may also cause similar disasters. For example, irrigation and hydraulic structures caused the originally stable slope to collapse from progressive erosion damage due to increased water infiltration. In this study, the apparatus design was carried out using the water tank of the traditional triaxial test. The critical seepage velocity of sand erosion caused by seepage erosion under different water flow rates was discussed. It is an important condition in simulating the deeper slope permeable layer. Design a set of apparatus that can be used to add confining pressure to the outside of the specimen to further understand the influence of confining pressure on soil seepage. Then use the drag equation in fluid dynamics as the theoretical basis to develop a set of failure criterion for soil seepage. It is expected to be applicable to the analysis of the current seepage conditions in the future. In this experiment, quartz sand with the same material size is used, and the seepage failure criterion derived from the resistance equation shows that the critical failure seepage velocity is affected by particle size, porosity, confining pressure, failure area and friction angle, and the experimental results are presented. The particle size and the confining pressure will significantly affect the critical failure flow rate of the sample.
文章公開時間: 2018-08-29
Appears in Collections:水土保持學系



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