The ground condition at a site are shown in th figure below
Water table is at ground level

Water content = 20%
Specific gravity of solids = 2.7
Unit weight of water = $10 k N / m^{3}$

The saturated unit weight of the sand $(k N / m^{3})$ is

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Solution

The correct option is C 21
Saturated unit wt.

$γ_{s a t} = [\frac{G_{s} + S e}{1 + e}] γ_{w}$

$= ⎡ ⎢ ⎢ ⎢ ⎣ \frac{G_{s} + w G_{s}}{1 + \frac{w G_{s}}{S}} ⎤ ⎥ ⎥ ⎥ ⎦ γ_{w}$

S = 1 ; w = 20%

$G_{s} = 2.7; γ_{w} = 10 k N / m^{3}$

$= ⎡ ⎢ ⎢ ⎢ ⎣ \frac{2.7 + 0.2 \times 2.7}{1 + \frac{0.2 \times 2.7}{1}} ⎤ ⎥ ⎥ ⎥ ⎦ \times 10$

= $21.039 k N / m^{3}$

= 21 kN/ $m^{3}$

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The ground condition at a site are shown in th figure below Water table is at ground level Water content = 20% Specific gravity of solids = 2.7 Unit weight of water = 10kN/m3 The saturated unit weight of the sand (kN/m3) is

The correct option is C 21Saturated unit wt. γsat=[Gs+Se1+e]γw =⎡⎢ ⎢ ⎢⎣Gs+wGs1+wGsS⎤⎥ ⎥ ⎥⎦γw S = 1 ; w = 20% Gs=2.7; γw=10kN/m3 =⎡⎢ ⎢ ⎢⎣2.7+0.2×2.71+0.2×2.71⎤⎥ ⎥ ⎥⎦×10 = 21.039kN/m3 = 21 kN/m3

The ground condition at a site are shown in th figure below
Water table is at ground level

Water content = 20%
Specific gravity of solids = 2.7
Unit weight of water = $10 k N / m^{3}$

The saturated unit weight of the sand $(k N / m^{3})$ is