JNC TN8430 2003-002 ) 7.878 15.138 47.155 exp( 2 ρ b ρ b κ + = κ [m 2 ] b ρ [Mg/m 3 ] * **
JNC TN8430 2003-002 March2003 Hydraulic characteristics of Buffer Material-II The influence which saline water exert on hydraulic properties of bentonite buffer material (Testing Document) Hirohito KIKUCHI**, Kenji TANAI*, Kazuhiro MATSUMOTO**, Haruo SATOU*, Kenichi UENO*, and Takeshi TETSU* Abstract By the second progress report(h12) on research and development for the geological disposal of HLW in Japan, Japan Nuclear Cycle Development Institute (JNC) extended the database on basic properties of compacted bentonite, and this was mainly obtained by using distilled water as test fluid. This report presents influence of dry densities, silica sand content and temperature on the hydraulic properties of compacted bentonite under condition of marine-based groundwater, which was simulated by use of synthesized seawater. We found that hydraulic conductivity increases with increasing temperature, and the relationship between effective clay density and intrinsic permeability is obtained by the following equation. κ = exp( 47.155 + 15.138ρ b 7.878ρ b ) where κ is intrinsic permeability[m 2 ], ρ is effective clay density[mg/m 3 ]. b Intrinsic permeability using synthetic seawater as test fluid is about ten times higher then that under distilled water condition. Difference between them however becomes smaller with increasing dry density. We also examined the smectite layers distance after test samples, but remarkable change was not found between them. 2 * Barrier performance group, Waste isolation research division, Waste management and fuel cycle research center, Tokai works ** Inspection Development Corporation
w ρ n S r ρ s Ww w = 100 W s ρ = W s d V V = v ρ = 1 d n 100 V ρs S V 1 w r = = 1 Vv 0.01 d w ρs
ρ d w n r S ρ d
Q k A i i A k Q = Q
Hydraulic conductivity[m/s] Temperature [] Hydraulic conductivity[m/s] Temperature []
k κ ρ g k = κρ g / µ ρ ρ µ ν µ ν
k κ ρ κ R s d ρb ρ s ρ b ρd (100 Rs ) = Rs 100 ρd ρ s ρb κ κ = exp( 47.155 + 15.138ρ b 7.878ρ b ) 2
Intrinsic permeability [m 2 ] Temperature [] Intrinsic permeability [m 2 ] Temperature []
κ = exp( 51.082 + 19.418ρ d 8.289ρ d R 2 = 0.9895 2 ) Intrinsic permeability [m 2 ] κ = exp( 47.12 + 15.064ρ d 7.842ρ d R 2 = 9907 Sand ratio= 0wt% Sand ratio=30wt% 2 ) Dry density [Mg/m 3 ] Intrinsic permeability [m 2 ] 2 κ = exp( 47.155 + 15.138ρ b 7.878ρ b ) R 2 = 9908 Effective clay density [Mg/m 3 ]
Temperature Hydraulic conductivity[m/s] Synthetic seawater k = exp( 25.64 + 8.29ρ b 5.689ρ R 2 = 9907 Distilled water k = exp( 29.815 + 7.801ρb 4.803ρ R 2 = 0.941 2 b 2 b ) ) Effective clay density [Mg/m 3 ]
Quartz peak Intensity [cps] 2(cuk )[deg] Quartz peak Intensity [cps] 2(cuk )[deg]
Intensity [cps] Distilled water Synthetic seawater 2(cuk)[deg]
JNC TN1400 99-0200241999 1990 1977 1987 PNC TN8430 93-0031993 PNC TN8410 90-0601990 3wt%NaCl Ca,2003 1991 PNC TN8410 92-0571992 JACOB BEARHydraulics of GroundwaterMcGraw-hill publishing company 1979 JIS K 0061. 2001 JIS Z 88031991 2000 PNC TN8410 97-2961997 p.2.19-12002 R.N.Yong Soil suction and soil-water potentials in swelling clays in engineered clay barriers Eng.Geol.,54,3-141999
JNC TN8430 2003-002 Appendix
JNC TN8430 2003-002
JNC TN8430 2003-002 0 W
JNC TN8430 2003-002 W W ) ( 1 W0 1 W W 2 W ) ( 2 W0 0
JNC TN8430 2003-002 D W2 W 0 0 [( W W0 )/( W1 W0 )] ( ρ w ρ a + ρa D = ) W 2 W1 W 2 W1 W 0 ρ w ρ a Cl Cl Cl Density[g/cm 3 ] water sea water(chemical Oceanography) test-1 test-2 Temperature
JNC TN8430 2003-002 w ρ a ρ D D D D
JNC TN8430 2003-002 ρw ρa D D D D
JNC TN8430 2003-002 ρw ρa D D D D
JNC TN8430 2003-002
JNC TN8430 2003-002 m 1 m 1 m 2 ν t2 ν = ν t 1 1 ν 1 t1 m 1 m 2 t2 m 1 m 2 µ ρ µ = ν ρ
JNC TN8430 2003-002 Viscosity mpa s water sea water NaCl(density5%) NaCl(density10%) NaCl(density15%) NaCl(density20%) NaCl(density25%) Temperature Viscosity mpa s Density of NaCl [%]
JNC TN8430 2003-002 1 ν 1 t 2 t ν ρ µ µ
JNC TN8430 2003-002 JIS K 00612001 JIS Z 88031991 JIS R 35032000 J.P.Riley and G.SkirrowChemical Oceanography1975 1975