An Investigation of Effects and Safety of Pipelines due to Twin Tunneling

Table 5

Pipeline parameters used in the centrifuge model tests.

Pipeline	Material	Section shape	Section width/diameter (mm)	Wall thickness (mm)	Elastic modulus, Ep (MPa)	Stiffness, EpIp (N·m^2)
Pipe 1	Aluminium pipeline	Square	19.05	1.63	70	2.56 × 10^10
Pipe 2	Aluminium pipeline	Tubular	19.06	6.23	70	7.54 × 10^9
Pipe 3	Plastic pipeline	Tubular	16.00	0.26	2.9	2.04 × 10^8