研究生: |
林瑞鈞 JUI-JIUN LIN |
---|---|
論文名稱: |
土壤與不織布複層過濾及排水效能評估 Experimental Evaluation of Filtration and Drainage Efficiency of Double Filter System Composed of Granular Soil and Nonwoven Geotextile Layers |
指導教授: |
楊國鑫
Kuo-Hsin Yang |
口試委員: |
林宏達
Horn-Da Lin 洪勇善 Yung-Shan Hong |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 英文 |
論文頁數: | 149 |
中文關鍵詞: | Geotextile 、granular soil 、double filter system 、hydraulic conductivity 、gradient ratio 、clogging |
外文關鍵詞: | Geotextile, granular soil, double filter system, hydraulic conductivity, gradient ratio, clogging |
相關次數: | 點閱:303 下載:4 |
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A double filter system, composed of a layer of granular soil overlying a nonwoven geotextile layer, is often applied in many geotechnical applications. However, until now, the filter and drainage efficiency of the double filter system have not been fully investigated. In addition, the material selection and design procedure for the double filter system have not well established. According, this thesis presents an experimental study to evaluate the drainage and filtration efficiency of double filter systems. An infiltration system including a large permeameter (H = 350 mm, D =158 mm), constant seepage apparatus, loading frame and manometer tubes was developed. A series of vertical downward seepage tests was conducted to quantify the system drainage and filtration efficiency by measuring the system hydraulic conductivity and the gradient ratio of the hydraulic gradient at the geotextile layer to that at the vegetative soil. The test variables include 2 geotextiles which have different thicknesses (Geotextile A with t =1.7 mm and Geotextile B with t =4.5 mm), 2 different granular filters (river and quartz sands) with 3 different granular filter thicknesses (0, 6 and 11cm) and test duration (0-7 days). The test specimen was prepared by filling the double filter system underlying a vegetative (local fine) soil. A surcharge of 10 kPa was applied on the top of specimens to model the soil overburden pressure above. The test results indicate the system hydraulic conductivity (vegetative soil + granular filter + geotextile) increases and the gradient ratio decreases as the granular filter thickness increases, suggesting that the granular filter can effectively reduce the long-term clogging of geotextile by preventing the fine particles of the vegetative soil from migrating through seepage. The tests with thinner geotextile (Geotextile A) and the granular filter with larger mean soil particle size (quartz sand) show better drainage efficiency and lower long-term clogging potential. In addition to the gradient ratio, the clogging of geotextile was also quantified by measuring the weight difference between geotextile before and after tests and observed using Scanning Electron Microscope (SEM) in this study. Based on the results in this study, an evaluation procedure was proposed for the material selection and design of the double filter system to encourage the practical application of double filter system in the geotechnical field.
A double filter system, composed of a layer of granular soil overlying a nonwoven geotextile layer, is often applied in many geotechnical applications. However, until now, the filter and drainage efficiency of the double filter system have not been fully investigated. In addition, the material selection and design procedure for the double filter system have not well established. According, this thesis presents an experimental study to evaluate the drainage and filtration efficiency of double filter systems. An infiltration system including a large permeameter (H = 350 mm, D =158 mm), constant seepage apparatus, loading frame and manometer tubes was developed. A series of vertical downward seepage tests was conducted to quantify the system drainage and filtration efficiency by measuring the system hydraulic conductivity and the gradient ratio of the hydraulic gradient at the geotextile layer to that at the vegetative soil. The test variables include 2 geotextiles which have different thicknesses (Geotextile A with t =1.7 mm and Geotextile B with t =4.5 mm), 2 different granular filters (river and quartz sands) with 3 different granular filter thicknesses (0, 6 and 11cm) and test duration (0-7 days). The test specimen was prepared by filling the double filter system underlying a vegetative (local fine) soil. A surcharge of 10 kPa was applied on the top of specimens to model the soil overburden pressure above. The test results indicate the system hydraulic conductivity (vegetative soil + granular filter + geotextile) increases and the gradient ratio decreases as the granular filter thickness increases, suggesting that the granular filter can effectively reduce the long-term clogging of geotextile by preventing the fine particles of the vegetative soil from migrating through seepage. The tests with thinner geotextile (Geotextile A) and the granular filter with larger mean soil particle size (quartz sand) show better drainage efficiency and lower long-term clogging potential. In addition to the gradient ratio, the clogging of geotextile was also quantified by measuring the weight difference between geotextile before and after tests and observed using Scanning Electron Microscope (SEM) in this study. Based on the results in this study, an evaluation procedure was proposed for the material selection and design of the double filter system to encourage the practical application of double filter system in the geotechnical field.
ASTM (D2434-68), “Standard Test Method for Permeability of Granular Soils (Constant Head)” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D421-85), “Standard Test Method for Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil Constants” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D4253-00), “Standard Test Method for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D4254-00), “Standard Test Method for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D4318-10), “Standard Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D4491-99a), “Standard Test Method for Water Permeability of Geotextiles by Permittivity” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D4751-12), “Standard Test Method for Determining Apparent Opening Size of geotextile1” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D5101-12), “Standard Test Method for Measuring the Filtration Compatibility of Soil-Geotextile System” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D5199-12), “Standard Test Method for Measuring the Nominal Thickness of Geosynthetics” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
ASTM (D6913-04), “Standard Test Method for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis” American Society for Testing Materials, West Conshohocken, Pennsylvania, USA.
Amneus, J. S., (1965) “A New Pulp Drainage Model, Its Application and Verification” Tappi Journal, 48, No11, pp. 641-647.
Berndtsson, J. C., (2010), “Green Roof Performance towards Management of Runoff Water Quantity and Quality: A Review” Ecological Engineering, 36, pp. 351-360.
Calhoun, C. C. Jr., (1972) “Development of Design Criteria and Acceptance Specifications for Plastic Filter Cloths” Technical Report S-72-7, US Army Waterways Experiment Station, Vicksburg, Mississippi, USA.
Chen, C. F., (2013), “Performance Evaluation and Development Strategies for Green Roofs in Taiwan: A Review” Ecological Engineering, 52, pp. 51-58.
Chen, R. H., Ho, C. C., and Chung, W. B., (2008), “The Filtration Mechanism and Micro-observation of Soil-geotextile Systems under Cyclic Flows” Journal of Geoengineering, 134, No3. pp. 101-112.
Fannin, J., (2008), “Karl Terzaghi: From Theory to Practice in Geotechnical Filter Design” Journal of Geotechnical and Geoenvironmental Engineering, 134, No3.
Faure, Y. H., Baudoin, A., Pierson, P., and Ple, O., (2006), “A Contribution for Predicting Geotextile Clogging during Filtration of Suspended Solids” Geotextiles and Geomembranes 24, pp. 11-20.
FHWA (1998), “Geosynthetic Design and Construction Guidelines” Federal Highway Administration Demonstration, HI-95-038, April. pp. 31-46.
Ghosh, C., and Yasuhara, K., (2004), “Clogging and Flow Characteristics of a Geosynthetic Drain confined in Soils undergoing Consolidation” Geosynthetics International, 11 NO. 1, pp. 19-34.
Hsiao, Y. L., and Chen, C. F., (2012) “Water Quality Analysis of Extensive Green Roof Runoff” Hwa Kang Journal of Agriculture 29, pp. 15-34 (in Chinese).
Koerner, R. M., and Ko, F. K., (1982) “Laboratory Studies on Long-term Drainage Capability of Geotextile” Proceedings of the Second Conference on Geotextiles, Las Vegas, USA, Vol 1, pp. 5-91.
Ling, H. I., Tatsuoka, F., Wu, T. H., and Nishimura, J., (1993) “Hydraulic Conductivity of Geotextiles under Typical Operational Conditions” Geotextiles and Geomembranes 12, pp. 509-542.
Palmeira, E. M., and Gardoni, M. G., (2002), “Drainage and Filtration Properties of Non-woven Geotextiles under Confinement using Different Experimental Techniques” Geotextiles and Geomembranes 20, pp. 97-115.
Rollin, A., and Lombard, G., (1988), “Mechanisms Affecting Long-Term Filtration Behavior of Geotextiles” Geotextiles and Geomembranes 07, pp. 119-145.
Rollin, A., Bolduc, G., Mlynarek, J., and Lewandowski, J. B., (1991), “Soil-Geotextile System Interaction” Geotextiles and Geomembranes 10, pp. 161-176.
蔡厚南 (2013),綠屋頂技術手冊,詹式書局,台灣,第18-28頁。