| Cite this article: | 谢中意,李明思,韩寒,等.用于农田排水暗管滤层的土工布水力性能与其孔隙结构关系的研究[J].灌溉排水学报,0,():-. |
| XIE Zhongyi,LI Mingsi,HAN Han,et al.用于农田排水暗管滤层的土工布水力性能与其孔隙结构关系的研究[J].灌溉排水学报,0,():-. |
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| The relationship between the hydraulic elements of geotextile and its pore structure used as the filter layer for drainage pipe in farmland |
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XIE Zhongyi, LI Mingsi, HAN Han, LAN Mingju
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College of Water Resources and Architectural Engineering,Shihezi University
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| Abstract: |
| 【Objective】It is necessary to comprehend the geotextile’s hydraulic performance when the geotxtile is selected reasonably as the filter layer of the subsurface drainage pipe in farmland drainage project. The objective of this study were to investigate the geotextile hydraulic elements and their influence factors.【Method】Firstly, 3 categories of geotextiles including the needled short-fiber geotextile, polyester-filament geotextile, and the super-thin geotextile, which in 10 types, were tested. Sceondly, different laboratory experiments including the microscopic observation technique, permeability test, water drainage in changed placement angle of geotextile, and the improved funnel-tension plate assembly, were used to test geotextiles’ hydraulic elements including the pore-structure, saturated permeability, unsaturated water-holding capacity. Finally, the mathematics models calculating the pore-structure were developed, on which the relationship between the hydraulic elements of geotextiles and their microstructure was determined.【Result】(1) With the volume density of geotextiles increasing, the plane porosity and spatial porosity of geotextiles gradually decreased. At the same time, the thickness-directional porosity of short-fiber geotextiles or polyester-filament geotextiles increased, and that of super-thin geotextiles first increased and then decreased. (2)The greater thickness-directional porosity of geotextiles, the better permeability of geotextiles in the vertical direction. (3) The water saturation of short-fiber geotextiles or polyester-filament geotextiles, placed from 0° to 90°, was gradually decreased. Simultaneously, the higher volume density of geotextiles, the strongerSwater-holding capacity. In addition, there was a positive correlation between the suction and thickness of geotextiles at the same water saturation.【Conclusion】The thickness-directional porosity of geotextiles gives the permeability and water-holding capacity with contrary influences. These research results of this paper can provide valuable information for the selection of the geotextiles in the designing of subsurface drainage pipe system. |
| Key words: subsurface pipe drainage; nonwoven geotextiles; pore structure; permeability; water holding capacity |
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