Table 3: Result of three axis test of shaft concrete under hydraulic coupling.

Test numberOsmotic pressure (MPa)Confining pressure (MPa)Peak stress (MPa)Peak strain (ε × 10−3)Initial permeability (10−18·m2)Secant elastic modulus (MPa)

147121.277.593.168721.29 × 103
267106.285.964.229823.17 × 103
369128.055.982.818533.27 × 103
489124.696.806.829122.42 × 103
5811136.546.994.434927.44 × 103
61011127.636.216.093328.21 × 103