(Ysat 19 kN/m³). c' and '. Chamber pressure, σ3 Test no. (kN/m²) Deviator stress, (Aσd) (kN/m²) Pore pressure at failure, (Au) (kN/m²) 1 100 170 -15 2 200 260 -40 3 300 360 -80 Cengage Learning 2014