Geotechnical Engineering Calculators
Bearing capacity, pile capacity, settlement, soil phase relationships and earth pressure — the ground checks that decide how deep a foundation has to go.
Slope Stability Calculator
Ordinary (Fellenius) factor of safety over a circular slip surface built from slices you define, with pore pressure applied to each slice.
FoS = sum(c*L + N*tan(phi)) / sum(W*sin(alpha)) Soil Bearing Capacity Calculator
Terzaghi bearing capacity with the standard shape factors, divided by a global safety factor to give an allowable pressure.
qu = c Nc sc + q Nq + 0.5 gamma B Ng sgamma ; q_all = qu / FS Pile Capacity Calculator
Single pile capacity in clay or sand from skin friction and end bearing, split into components and divided by a safety factor.
Qs = alpha c pi D L ; Qp = Nc c pi D^2 / 4 ; Q_all = (Qs + Qp)/FS Foundation Settlement Calculator
Estimate immediate elastic settlement and one-dimensional consolidation settlement beneath a footing.
de = q B (1 - nu^2) If / E ; sc = Cc H /(1+e0) log10((s0 + ds)/s0) Soil Voids Ratio Calculator
Derive void ratio, porosity, degree of saturation and the dry, saturated and submerged unit weights from bulk unit weight and water content.
e = (Gs gamma_w (1+w) / gamma) - 1 ; n = e/(1+e) ; Sr = w Gs / e Differential Settlement Calculator
Angular distortion and differential settlement along a row of footings, from your reference settlement and bearing pressures, finding the worst local pair rather than the end-to-end average.
s = (σ/σ_ref)·s_ref; Δ/L = |s_j − s_i| / L (local pairs) Earth Pressure Calculator
Rankine active and at-rest horizontal earth pressure with surcharge, resultant thrust and the height at which it acts.
Ka = (1-sin phi)/(1+sin phi) ; K0 = 1 - sin phi ; Pa = 0.5 gamma H^2 Ka + q Ka H