Geotechnical Engineering

DHARM 140 GEOTECHNICAL ENGINEERING 5.9.2 Capillary Rise in Soil The rise of water in soils above the ground water table is analo ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 141 Table 5.2 Typical ranges of capillary rise in soils (Mc Carthy, 1977) Soil ...

DHARM 142 GEOTECHNICAL ENGINEERING responsible for capillary rise. There would be menisci at both ends of the suspended column, ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 143 At level PP: Total stress σ = (hc + hs) γsat Neutral stress u = hsγw Effect ...

DHARM 144 GEOTECHNICAL ENGINEERING If a dry and powdered soil sample is thoroughly mixed and packed into a glass tube with a scr ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 145 If the degree of saturation is S, Darcy’s Law for a particular value of x, ...

DHARM 146 GEOTECHNICAL ENGINEERING The left-hand side of Eq. 5.41 is nothing but the slope m of this plot ; thus, we have two va ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 147 n dz dt k hz z ..= ()c− If z is zero when t is zero, the solution of this d ...

DHARM 148 GEOTECHNICAL ENGINEERING γsat = Ge e w + + F HG I 1 KJ .γ = (.. ) . 268 072 172 + × 9.81 kN/m^3 = 19.39 kN/m^3 Total p ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 149 Let us assume: G = 2.65 or 17.66 = (. ) () (^265) (. ) 1 981 e e whence e ...

DHARM 150 GEOTECHNICAL ENGINEERING Neutral stress at 15 m below the bottom of the lake: u = 21 × 9.81 kN/m^3 = 206.0 kN/m^2 Effe ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 151 It may be pointed out that the pore pressure in the zone of partial capilla ...

DHARM 152 GEOTECHNICAL ENGINEERING Dry weight of sample = 4.86 N Volume of sample = A. L = 6.25 × π × 15 cm^3 = 294.52 cm^3 Dry ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 153 When h 1 = 50; h 2 = 25; substituting: 1 300 log 10 (50/48) = (1/t) log 10 ...

DHARM 154 GEOTECHNICAL ENGINEERING k 1 = 8 × 10–4 cm/s h 1 = 7 m k 2 = 52 × 10–4 cm/s h 2 = 3 m k 3 = 6 × 10–4 cm/s h 3 = 10 m k ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 155 We know, k = qrr zz log ( / )e () 21 2 2 1 π−^2 = 2 303 2 70 15 100 60 31 3 ...

DHARM 156 GEOTECHNICAL ENGINEERING ∴ k 2 = 0 2025 0 1296 . . × 0.36 = 5.625 × 10–1 mm/s. Example 5.15. Permeability tests on a s ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 157 = 3 × 9.81 kN/m^2 = 29.43 kN/m^2. Example 5.17. The D 10 size of a soil is ...

DHARM 158 GEOTECHNICAL ENGINEERING Substituting, hc = 4 T d s γwc = 36 cm, since dc for the second soil is double that of the fi ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 159 Pressure at X = + hcγw = 15 981 100 ..× = 0.147 kN/m (^2) = 147 N/m 2 Press ...