NDLI: Advances in experimental investigation on hydraulic fracturing behavior of bentonite-based materials used for HLW disposal

Content Provider	Springer Nature Link
Author	Chen, Yong Gui Jia, Ling Yan Ye, Wei Min Chen, Bao Cui, Yu Jun
Copyright Year	2016
Abstract	Bentonite-based materials (BBM) in the form of blocks or rings have been commonly proposed as buffer materials for high-level radioactive waste disposal. In a real repository, hydraulic fracturing is likely to be present when the ground water pressure exceeds to hydraulic resistance, and the existence of technological gaps increases the risk of hydraulic fracturing. Based on the previous studies of hydraulic fracturing of BBM and technological interfaces, the present work systematically analyzes the experimental achievements. Results show that the fracturing pressure of BBM and interfaces increases with hydration time, initial dry density, bentonite content and overburden pressure, while it decreases with initial water content and gap thickness. The temperature effect on hydraulic fracturing depends on the predominant cation of bentonite. For Na-bentonite, the higher temperature leads to the larger swelling pressure, and thus the stronger hydraulic resistance. Tensile failure, shear failure and synthesis failures are increasingly accepted for hydraulic fracturing mechanism. The hydraulic fracturing of highly compacted BBM is mainly controlled by tensile failure, while the initial shear failure can be found for BBM with a low enough density. Since hydraulic fracturing is expected to occur several times during the repository operation, the long-time monitoring of hydro-mechanical behavior is of vital importance until the technological gaps are completely sealed. Furthermore, the failure mechanism of hydraulic fracturing of BBM should be further researched, as well as the sealing properties of interfaces under thermo-hydro-mechanically coupled conditions are proposed to be studied thoroughly.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-04-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geological disposal High-level radioactive waste Bentonite-based materials Hydraulic fracturing Technological gap Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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