Table 1: Calculation parameters.

Material Elastic modulus E
(GPa)		 Poisson’s ratio
μ 		Unit weight γ
(kN/m3)		 Cohesion c
(MPa)		 Internal friction angle φ
(°)
Soil mass 2.0 0.4 18 0.14 25
Initial lining 31.5 0.2 25 -- --
Secondary lining 31.5 0.2 25 -- --