Geotechnical Engineering

DHARM 160 GEOTECHNICAL ENGINEERING 2 2mm 3 3 mm Submerged Capillary conditions (assume 100% saturation) Dry (assumed) Original W ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 161 that which is borne through grain-to-grain contact is called the ‘effective ...

DHARM 162 GEOTECHNICAL ENGINEERING J.S. Kozeny: Über Kapillare Leitung des wassers in Boden, Berlin Wein Akademie, 1927. T.W. L ...

DHARM SOIL MOISTURE–PERMEABILITY AND CAPILLARITY 163 5.6 What are the various parameters that effect the permeability of soil in ...

DHARM 164 GEOTECHNICAL ENGINEERING 5.18 (a) State the important factors that affect the permeability of a soil. (b) A permeamete ...

6.1 Introduction ‘Seepage’ is defined as the flow of a fluid, usually water, through a soil under a hydraulic gradient. A hydrau ...

DHARM 166 GEOTECHNICAL ENGINEERING ‘flow channels’ of equal size. Since the flow is purely vertical, there cannot be flow from o ...

DHARM SEEPAGE AND FLOW NETS 167 ∴ qa = k. H nld. . b Since a square net is chosen, b = l. ∴ qa = kH. l nd . Since all flow throu ...

DHARM 168 GEOTECHNICAL ENGINEERING heads at elevations 700 mm and 300 mm are 100 mm and – 140 mm, respectively, as shown at the ...

DHARM SEEPAGE AND FLOW NETS 169 shown has been drawn within these boundaries. With the aid of flow net, we can compute the seepa ...

DHARM 170 GEOTECHNICAL ENGINEERING Impervious H L Dam Fig. 6.4 Concrete dam with cut-offs at heel and at toe Impervious Dam H Fi ...

DHARM SEEPAGE AND FLOW NETS 171 H Dam Impervious blanket Filter Impervious Fig. 6.7 Concrete dam with impervious blanket on the ...

DHARM 172 GEOTECHNICAL ENGINEERING 6.3.3 Flow through Earth Dam The flow through an earth dam differs from the other cases in th ...

DHARM SEEPAGE AND FLOW NETS 173 Vertical component of flow Z Y X dz dy dx (x, y, z) Fig. 6.10 Flow through an element of soil By ...

DHARM 174 GEOTECHNICAL ENGINEERING ∆q may be obtained in a different manner as follows: The volume of water in the element is: V ...

DHARM SEEPAGE AND FLOW NETS 175 But kx. ∂h/∂x = vx and kz. ∂h/∂z = vz, by Darcy’s law. ∴ ∂ ∂ ∂ ∂ v x v z xz+ = 0 ...(Eq. 6.5) Th ...

DHARM 176 GEOTECHNICAL ENGINEERING Functions φ and ψ are termed ‘Conjugate harmonic functions’. In such a case, the curves ‘‘φ(x ...

DHARM SEEPAGE AND FLOW NETS 177 lB bB aA aB aB kB b lA k A A Fig. 6.11 Flow at the boundary between two soils qA = qB But qA = k ...

DHARM 178 GEOTECHNICAL ENGINEERING From the transformed section, the rate of seepage can be determined using Eq. 6.1 with except ...

DHARM SEEPAGE AND FLOW NETS 179 unconfined flow, the top flow line is not known and hence should be determined first. The top fl ...