Influence of clogging substances on pore characteristics and permeability of geotextile envelopes of subsurface drainage pipes in arid areas

文献类型： 外文期刊

第一作者： Guo, Chenyao

作者： Guo, Chenyao;Wu, Jingwei;Zhu, Yan;Lin, Zhongbing;Qian, Yingzhi;Yang, Haoyu;Li, Hang;Mao, Wei;He, Shuai

作者机构：

关键词： Geosynthetics; Geotextile envelope; Clogging substances; Pore size characteristic; Permeability coefficient; Potential susceptibility

期刊名称：GEOTEXTILES AND GEOMEMBRANES （ 影响因子：5.292； 五年影响因子：5.918 ）

ISSN： 0266-1144

年卷期： 2020 年 48 卷 5 期

页码：

收录情况： SCI

摘要： This study investigates the influence of clogging substances on pore characteristics and permeability of geotextile envelopes that were used for 3, 7 and 15 years in irrigated farmlands in Xinjiang region, which is arid and suffers from the soil salinity problem. Results show that the macropores (above 125 mu m) of envelopes are evidently clogged, whereas the smaller pores less than 100 mu m are still unblocked after operation. The permeability coefficients of geotextile envelopes after serving for 3 and 15 years are smaller than the minimum required permeability coefficients after clogging. The main chemical components of clogging substances in the geotextile envelope are silicon dioxide and calcium carbonate. Calcium carbonate content of the geotextile envelope is consistent with calcium carbonate content of soil. Chemical clogging susceptibility increases with the operation time of the subsurface drainage pipes. The ratio of O-90 size of envelope material over d(90) of soils (O-90/d(90)) and saturation index (SI) can be used to assess the susceptibility of physical and chemical clogging respectively. This study provides a preliminary reference for estimating the clogging susceptibility of geotextile envelopes in arid areas.

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