10-8 9 8 7 6 5 10-6 4 3 Kvo,m/s 10-9 10-7 9 8 7 6 5 rk = 1.5 4 cm/sec rk = 1 2 Deltaic 3 Champlain clays Other Canadian clays Other clays φ 50 mm triaxial tests 2 Atchafalaya 10-10 10-10 2 3 4 5 6 7 8 9 -9 10 2 3 Kho, m/s 4 10-8 5 6 7 8 9 -8 10 Comparison of vertical and horizontal permeabilities in intact natural clays. For marine clays (mostly Canada) Typical rk= kh/kv = 1.0 - 1.5 kv = 10 + 5 x 10-8 cm/sec 101 2.3 2 3 5 l o g σ' vc (kPa) 2 3 4 103 5 6 7 8 9 1.75 σp̀ 2.1 1.50 σv̀o 1.25 e - lg σv̀ 1.9 1.00 e - lg k 1.7 ck = 0.5 eo ck Void Ratio, α 4 σ' ,kPa v 102 6 7 8 9 0.75 1.5 ck = 1/3 eo 0.50 ck = de / d log k ~ ( 12 1g = log10 1.3 0.25 - 1 3 ) eo Champlain clays Other Canadian clays 1.1 10-10 0 2 3 4 5 6 7 8 9 10-9 Permeability k, m/s 2 3 4 5 6 7 8 9 10-8 l o g k (m / s ) The e vs. lg σv̀ and e vs. lg k relationships from a typical OEDK test on Louiseville clay. Other clays 0 0.5 1.0 1.5 eo 2.0 2.5 3.0 3.5 Relation between the permeability change index Ck and eo for all clays tested. Adapted from Tavenas et al. (1983). "The Permeability of Natural Salt Clays: Parts I & II." CGJ 20(4), 629-668 Vicksburg Silty Clay: WL = 37, WP = 23 & IP = 14 120 S= 10-5 10-6 Low Wopt 10-7 10-8 10-9 10 Dry Unit Weight (pcf) Conductivity (cm/s) (for S = 100%) 10-4 Medium High Effort a 15 20 Molding Water Content (%) 25 110 10 0% High Medium 100 Low Compactive Effort b 90 10 Kneading Compection 15 20 Molding Water Content (%) Data from Mitchell et al. ASCE, JSMFD 91(4). (1965) for Silty Clay Compacted with Impact Compaction: (a) Hydraulic Conductivity versus Molding Water Content; (b) Compection Curve (1 pct = 0.157 kN/m3) Adapted from Daniel & Benson (1990), ASCE JGE 116(12) 25

IV-3a Coefficient of Permeability

Related Documents

Recommended Documents

Description

Related Documents

Want to Download This Document?

Free up your schedule!

Take 5 seconds to unlock