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Effect of Water Table on Bearing Capacity of Soil
where R_{q}^{*} and R_{y}^{*} are water table correction factor.
when 0 ≤ z_{q} ≤ D_{f} when 0 ≤ z_{γ} ≤ B.
If Z_{γ} > B they R_{γ}^{* }= 1
If Z_{γ }≤ 0 they
If water table rise to G.L
R_{q}^{*} = 1 / 2 and R_{γ}^{*} = 1 / 2
Significant for Granular Soils
Pecks Equation
q_{a net} = 0.44NS = C_{w}kN/m^{2}
D_{w} = depth of water table below G.L
D_{f} = Depth of foundation
B = Width of foundation
N = Avg. corrected S.P.T. no.
S = Permissible settlement of foundation
C_{w} = Water table correction factor
q_{a net} = Net allowable bearing pressure.
Teng's Equations
C_{w} =Water table correction factor
D_{w} = Depth of water table below foundation level
B = Width of foundation
C_{d} =Depth correction factor
S = Permissible settlement in 'mm'.
I.S Code Method
q_{ns} =Net safe bearing pressure in kN/m^{2}
B = Width in meter.
S = Settlement in 'mm'.
I.S. Code Formula for Raft
q_{ns} = 0.88NSC_{w}
C_{w}: Same as of peck Henson.
MeyerHoffs Equation
q_{ns} = 0.88NSC_{w}C_{d}
where, q_{ns} = Net safe bearing capacity in kN/m^{2}.
B < 1.2 m
B ≥ 1.2 m (where q_{ns} is in kN/m^{2}.
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