华中科技大学学报（自然科学版）2024，Vol.52Issue(4)：121-127,7.DOI:10.13245/j.hust.240097
无纺土工织物过滤黏性土的长期渗透试验研究
Experimental study on long-term permeability tests of nonwoven geotextile filtering clayey soil
摘要
Abstract
Nonwoven geotextiles with different masses per unit area(gram weight)and silty clay were used to investigate the filtration characteristics of nonwoven geotextiles filtering clayey soil during long-term seepage.The permeability coefficient of the soil-nonwoven geotextile system was measured,and the variation of the permeability coefficient with time was analyzed using a series of long-term permeability tests.The long-term seepage filtration characteristics of the soil-geotextile system were then discussed.The equivalent porosity approach for determining the permeability coefficient of filtered nonwoven geotextiles was proposed in conjunction with the current formula for calculating the permeability coefficient of nonwoven geotextiles.Results show that the permeability coefficient of the soil-nonwoven geotextile system decreases continuously with penetration time before becoming stable,and the connection between the permeability coefficient and penetration time fits the power function.The permeability of a nonwoven geotextile filter is characterized by its permeability coefficient,which is determined by its porosity after being clogged with fine particles.Based on the simplified approach of equivalent porosity,the permeability coefficient of filtered nonwoven geotextiles decreases by an order of magnitude while still meets the filtration criterion.The established power function connection of the permeability coefficient with penetration time can better reflect the clogging and permeability of nonwoven geotextile filters.关键词
土-无纺土工织物体系/反滤/长期渗透试验/渗透系数/等效孔隙率Key words
soil-nonwoven geotextile system/filtration/long-term permeability test/permeability coefficient/equivalent porosity分类
建筑与水利引用本文复制引用
杜春雪,徐超,杨阳,李明艳..无纺土工织物过滤黏性土的长期渗透试验研究[J].华中科技大学学报（自然科学版）,2024,52(4):121-127,7.基金项目
国家自然科学基金资助项目(42172297). （42172297）
