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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >Unsaturated hydraulic properties of a nonwoven polypropylene geotextile
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Unsaturated hydraulic properties of a nonwoven polypropylene geotextile

机译：非织造聚丙烯土工布的不饱和水力学性能

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摘要

Geotextiles are increasingly being used to modify the environment and terrain for a wide variety of uses, such as reinforcement, separation and drainage to improve the performance of roads, both paved and unpaved; drainage and separation in landfill covers and liners; and reinforcement for slopes, embankments, and retaining walls. These geotextiles are often in contact with unsaturated soils; however, the hydrologic behavior of geosynthetic materials in unsaturated environments is most often ignored because the basic characterization of these materials does not exist. One example that illustrates the significance of the hydrologic interaction between geosynthetics and unsaturated soils involves the behavior of some geosynthetic materials as a capillary break. A capillary break is a layer which essentially interrupts the unsaturated movement of water because its unsaturated hydraulic conductivity is so low. Preliminary work by the US Army has shown the promise of some geosynthetics as capillary breaks to prevent water from being drawn up beneath a pavement and thus limit frost heave and subsequent thaw weakening (Henry and Holtz, 1997). While capillary breaks using geosynthetics may have many positive applications, it is possible that geosynthetics may inadvertently form capillary breaks and have negative consequences. For example, a recent side slope failure of a landfill cover was attributed to a geotextile inadvertently acting as a capillary break (Richardson, 1997). In this paper, the characterization of the unsaturated hydraulic properties of a nonwoven, polypropylene geotextile is given. The geotextile has a mass per unit area of 340 g/m~2 with an apparent opening size of 0.18 mm. The characterization involves determination of the water retention function and the transmissivity - suction head relationship. The results suggest that geotextiles have unsaturated , properties quite different than most soils.
机译：土工布越来越多地用于改变环境和地形，以用于多种用途，例如加固，分隔和排水，以改善铺装和未铺装道路的性能；垃圾掩埋场和衬里的排水和分离；以及对斜坡，路堤和挡土墙的加固。这些土工织物通常与不饱和土壤接触；然而，由于不存在土工合成材料的基本特征，因此人们经常忽略其在非饱和环境中的水文行为。一个说明土工合成材料和非饱和土壤之间水文相互作用的重要性的例子涉及某些土工合成材料的行为，如毛细破坏。毛细破坏是基本上中断水的不饱和运动的层，因为其不饱和水力传导率非常低。美国陆军的初步工作显示了某些土工合成材料的前景，即毛细破坏会阻止水在人行道下方被吸入，从而限制霜冻的发生和随后的融化减弱（Henry和Holtz，1997年）。虽然使用土工合成材料的毛细破坏可能有许多积极的应用，但土工合成材料可能会无意间形成毛细破坏，并产生负面影响。例如，最近的一个垃圾掩埋场边坡破坏是由于土工织物无意中起到了毛细作用（Richardson，1997）。本文给出了非织造聚丙烯土工布不饱和水力特性的表征。土工织物的单位面积质量为340 g / m〜2，表观开口尺寸为0.18 mm。表征涉及保水功能和透射率-吸头关系的确定。结果表明，土工织物具有非饱和特性，与大多数土壤完全不同。

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