Geotechnical Engineering

DHARM 220 GEOTECHNICAL ENGINEERING Substituting for ∆e in terms of the compression index, Cc from Eq. 7.4, recognising (e – e 0 ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 221 If the samples were to be hermetically sealed, permitting no escape of wate ...

DHARM 222 GEOTECHNICAL ENGINEERING to diminish, the spring starts getting compressed as the piston descends consequent to expul- ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 223 and the pore water by the water in the cylinder. The more compressible the ...

DHARM 224 GEOTECHNICAL ENGINEERING Pressure increment 1 2 3 Q Q t=0 h=Dsg/w P 123 P 4 DsJ 4 t=t 1 t=t 2 t=t 3 t=¥ Fig. 7.20 Mech ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 225 Certain soil properties such as permeability and modulus of volume change ...

DHARM 226 GEOTECHNICAL ENGINEERING on application of the pressure increment, pore water starts to flow towards the drainage face ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 227 This is written as: ∂ ∂ = ∂ ∂ u t c u v z . 2 2 ...(Eq. 7.19) where cv = k ...

DHARM 228 GEOTECHNICAL ENGINEERING This should be the same as the time-rate of volume decrease. Volumetric strain = mv.∆σ = – mv ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 229 This solution enables the hydrostatic excess u to be computed for a soil ma ...

DHARM 230 GEOTECHNICAL ENGINEERING It may be shown that if there exists a single drainage face only for the layer, one of the bo ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 231 7.6 Graphical Presentation of Consolidation Relationships One-dimensional c ...

DHARM 232 GEOTECHNICAL ENGINEERING Figure 7.22 does not depict how much consolidation occurs as a whole in the entire stratum. T ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 233 u 0 2H u 2 u 1 u 3 u 1 u 2 u=ui 0 I(a) I(b) u = u + u ———i 12 H–zH II u = u ...

DHARM 234 GEOTECHNICAL ENGINEERING Unless otherwise stated, it is the average consolidation ratio for a stratum that is re- ferr ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 235 excess pore pressure is not shown or is ignored; this effect is known as ‘S ...

DHARM 236 GEOTECHNICAL ENGINEERING this can be read off from the laboratory plot. The point corresponding to 100% primary consol ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 237 Tangent Asymptote 0.008 0.01 0.1 1 2 3 Time factor T (log scale) 2 20 40 60 ...

DHARM 238 GEOTECHNICAL ENGINEERING 0.020 0.015 0.010 0.005 Coefficient of consolidation mm /s 0 2 Effective stress,skN/m^3 100 2 ...

DHARM COMPRESSIBILITY AND CONSOLIDATION OF SOILS 239 Secondary consolidation is believed to come into play even in the range of ...