An experimental study of clogging of the geotextile filter system under normal stress

PENG Shantao; XU Chao; DU Chunxue; ZHANG Pengcheng

doi:10.16030/j.cnki.issn.1000-3665.202106037

2022 Vol. 49, No. 2

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Article navigation > Hydrogeology & Engineering Geology > 2022 > 49(2): 71-76

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PENG Shantao, XU Chao, DU Chunxue, ZHANG Pengcheng. An experimental study of clogging of the geotextile filter system under normal stress[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 71-76. doi: 10.16030/j.cnki.issn.1000-3665.202106037

Citation:

PENG Shantao, XU Chao, DU Chunxue, ZHANG Pengcheng. An experimental study of clogging of the geotextile filter system under normal stress[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 71-76. doi: 10.16030/j.cnki.issn.1000-3665.202106037

An experimental study of clogging of the geotextile filter system under normal stress

1.
Department of Geotechnical Engineering, Tongji University, Shanghai　200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai　200092, China
3.
Shanghai Investigation, Design & Research Institute Co. Ltd., Shanghai　200434, China

More Information

Corresponding author: DU Chunxue, cx_d0114@tongji.edu.cn

Received Date: 16 June 2021

Revised Date: 09 August 2021

Publish Date: 15 March 2022

Abstract

Abstract

For simulating the actual working conditions, a series of gradient ratio tests of geotextile filtering clay are completed by using an improved gradient ratio permeameter that can apply vertical load. The tests are carried out under the condition of the critical hydraulic gradient (1.0) and hydraulic gradient equal to 2.0, respectively, with the 4th layer of clay soil in Shanghai and the short fiber needle punched non-woven geotextile. The variation of the filtration performance of geotextile with hydraulic gradient and normal stress is studied by changing the vertical load. The results show that the hydraulic gradient and normal stress are the important factors affecting the clogging characteristics and the permeability of geotextile filter. The gradient ratio of the geotextile filter clay increases with the increase of the vertical load, but there is no impermissible clogging when it is stable. Under a certain load, the coefficient of permeability decreases with time and then tend to stabilize. The stabilized coefficient of permeability decreases with the increase of the vertical load. The hydraulic gradient from 1.0 to 2.0 also causes the increase of the gradient ratio and the decrease of the permeability. The test results better reflect the filtration effect of the geotextile filter under the actual working conditions, which can provide references for similar engineering design.
- geosynthetics /
- nonwoven geotextiles /
- filtration /
- normal stress /
- gradient ratio test

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References

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