Calcolatrice Capacità Portante del Suolo Gratuita

Calcola la capacità portante del suolo con la formula di Terzaghi.

kPa
kN/m^3
m
m

Ultimate Bearing Capacity

643.8 kPa

Allowable Bearing (FoS=3)214.6 kPa

Ultimate Bearing Capacity vs Soil Cohesion (c)

Vedi formula →

Formula

## Terzaghi's Bearing Capacity Theory The bearing capacity of a shallow foundation depends on soil properties, foundation depth, and width. ### Formula (strip footing) **q_u = c Nc + gamma Df Nq + 0.5 gamma B Ngamma** The three terms represent cohesion resistance, surcharge (overburden) resistance, and self-weight resistance. Nc, Nq, and Ngamma are dimensionless bearing capacity factors that depend on the soil friction angle.

Esempio Risolto

A 2 m wide strip footing at 1.5 m depth, c=20 kPa, gamma=18 kN/m^3, phi=20 deg.

  1. 01Cohesion term: 20 x 17.7 = 354 kPa
  2. 02Surcharge term: 18 x 1.5 x 7.4 = 199.8 kPa
  3. 03Width term: 0.5 x 18 x 2 x 5.0 = 90 kPa
  4. 04q_u = 354 + 199.8 + 90 = 643.8 kPa
  5. 05q_a = 643.8 / 3 = 214.6 kPa (with FoS = 3)