| 引用本文: | 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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| 摘要: |
| 【目的】为了在农田排水暗管设计中能合理地选择作为滤层的土工布,有必要了解土工布的水力性能及其影响因素。本文研究目的是探讨土工布水力性能与孔隙结构之间的关系。【方法】研究中选取了针刺短丝、聚酯长丝、超薄型等3种类型共10个规格的土工布,分别用显微观测技术分析、渗透技术、变角排水技术和改进砂芯漏斗技术,观测了土工布孔隙结构、饱和渗透特性、非饱和持水特性等指标；建立了评估土工布孔隙结构的模型；并在此基础上分析研究了土工布水力性能与其孔隙结构之间的关系。【结果】结果表明：(1)土工布的平面孔隙率和空间孔隙率都与其体积密度呈负相关关系；短丝和长丝类型的土工布的纵向孔隙率与其体积密度之间呈正相关关系；而超薄型土工布的纵向孔隙率随着体积密度的增大而先增大后减小。(2)各类土工布的垂直渗透性能都与土工布的纵向孔隙率呈正相关关系。(3)短丝和长丝类型的土工布的饱和度均随着土工布放置角度由小(0°)变大(90°)而降低；体积密度更大的土工布的持水能力更强；在同一饱和度下,这两种类型土工布的吸力与其厚度之间呈正相关关系。【结论】土工布的纵向孔隙率对其渗透能力和持水能力的影响相反。本文研究结果可为土工布的选择提供参考。 |
| 关键词: 暗管排水;非织造土工布;孔隙结构;渗透性;持水性 |
| DOI： |
| 分类号:S276.7 |
| 基金项目: |
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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 |
