IS 6403Cl. 5

Safe bearing capacity of shallow foundations

Net ultimate bearing capacity is computed via the Terzaghi-style equation with shape, depth, and inclination factors. Safe bearing capacity is q_u / FoS (typical FoS = 2.5 to 3.0).

Formulas

Net ult. bearing

q_n,u = c·N_c·s_c·d_c + (D_f·γ)·(N_q − 1)·s_q·d_q + 0.5·B·γ·N_γ·s_γ·d_γ

Safe bearing

q_s = q_n,u / FoS

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Editorial paraphrase for fast lookup — the official IS 6403 text is authoritative. For exact wording, refer to the published code.