无纺土工织物孔径测量技术

Measurement of pore size of geotextile under different pressures

无纺土工织物的孔径大小及其分布是工程应用的重要技术指标,本文提出这个指标在不同压力下的两种测量技术:①负压法测孔技术,根据毛管理论,试验研究织物的亲水性cosθ以解决测量技术的关键,可测不同压力下织物孔径分布;②渗透法测孔技术,根据管道层流理论,试验研究织物的水流阻力比x以解决测量技术的关键,可测不同压力下织物特征孔径O50,O95;这二种测孔技术其原理明确、方法简单、使用方便、测量可靠、通用性强。这项研究成果为国内外首创。

Pore size of geotextile was one of the important parameters for application in engineering practices. Two methods were presented for the measurement of geotextile pore size under different pressures： ①Negative pressure method： based on the capillary theory, hydrophilic nature of geotextile, cosθ, was determined by experiment, and then the pore size distribution of geotextile under different pressures could be obtained.②Penetration method： based on the laminar flow theory, the ratio of flow resistance, χ, was determined by experiment, and then the characteristic pore sizes of geotextile, 050 and 095, could be obtained under different pressures. The two methods for measurement of pore size are of advantages of convenience, reliability and practicabitity.