Babu, GLS and Sporer, H and Zanzinger, H and Gattung, E (2022) Desiccation behaviour of selected geosynthetic clay liners. [Book Chapter]
Full text not available from this repository. (Request a copy)Abstract
Most capping systems of waste containment facilities have a mineral layer of low hydraulic conductivity to restrict the movement of fluids into waste body. These covers are intended to have sufficient capacity for containment of precipitation, and self healing properties enabling closure of cracks in the case of desiccation. Geosynthetic clay liners (GCLs) are being increasedly used to serve this function. However, a few case studies indicate that under some ground and climatic conditions, bentonite in GCLs desiccates leading to cracks and percolation of rain water through the cover systems. The objective of this paper is to examine the desiccation behaviour of GCLs and delineate the factors responsible for desiccation. Suction pressures in bentonitic materials used in GCLs in a typical cover system are evaluated and it is brought out that large variations in suction pressures are induced under simulated field conditions. It is shown that the suctions present in an initially dry GCL reduce to very low levels of suction quite rapidly which ensures high water content and hence the sealing effect. Low levels of suction are retained under different simulated field conditions of temperature and other associated changes as long as the soil layers adjoining the GCL are in a low suction range or if the low suction level is maintained. However, high suctions are induced in a GCL if it is placed next to zones having high suctions or materials such as gravel or dry sands that cannot retain large suctions leading to desiccation. © 2002 Swets & Zeitlinger, Lisse.
| Item Type: | Book Chapter |
|---|---|
| Publication: | Clay Geosynthetic Barriers |
| Publisher: | CRC Press |
| Additional Information: | The copyright for this article belongs to CRC Press |
| Department/Centre: | Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 23 May 2022 05:54 |
| Last Modified: | 23 May 2022 05:54 |
| URI: | https://eprints.iisc.ac.in/id/eprint/71809 |
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