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Experimental study on permeability characteristicsof clay-gravel mixtures
under freezing-thawing actions in core wall of earth-rock dams
1
LU Yang 1,2 ,LIU Sihong 1,2 ,ZHANG Yonggan ,
1 1,2 3
YANG Meng ,WANG Liujiang ,LI Zhuo
(1. College of Water Conservancy and Hydropower,Hohai Univ.,Nanjing 210098,China;
2. International Joint Laboratory of Long-term Behaviour & Environmentally Friendly Rehabilitation Technologies on Dams,
Nanjing 210098,China;3. Dame Safety Management Department,
Nanjing Hydraulic Research Institute,Nanjing 210029,China))
Abstract:Clay-gravel mixture is generally used as the compacted impermeable material in the core wall of
high earth-rock dams. In high cold regions, it will endure severe freeze-thaw actions during the construc⁃
tion process. In this study,a series of triaxial permeability tests were performed to investigate the evolution
law of permeability characteristics after freeze-thaw cycles. The results show that:(1) the permeability coef⁃
ficient increased significantly after freeze-thaw cycles,and the degree of increase was controlled by various
factors such as confining pressure,number of freeze-thaw,gravel content and the initial molding water con⁃
st nd
tent;(2) the 1 -2 cycle of freezing-thawing has the most prominent influence on the increase of permea⁃
bility;(3) a lower confining stress and a higher molding water content will dominate the increase of perme⁃
ability induced by freeze-thaw actions;(4) the effect of gravel content on the permeability is closely relat⁃
ed to the inner meso-structural distribution of clay-gravel particles;(5) the freeze-thaw triggered variation
of permeability will significantly increase with increasing the initial molding water contents, and a greater
increasing amplitude will be found on the dry side of optimum water content,while a smaller amplitude on
the wet side. The results can provide useful guidance for the design of impervious structures in high
earth-rock dam as well as the prevention of freeze-thaw damages during its construction in winter.
Keywords: high cold region; core-wall dam; clay-gravel mixture; freeze-thaw cycles; permeability; me⁃
so-structure
(责任编辑:王冰伟)
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