Influence and the Control of Shield Tunneling on Ancient Tower Vibration

Table 2

Shield model material parameters.

Material	Thickness (m)	Density (kg/m^3)	Poisson’s ratio	Elastic modulus (MPa)
Miscellaneous fill	1.5	1,930	0.35	140
Strongly weathered quartzite	1.1	2,070	0.22	1,130
Apoplectic quartzite	97.4	2,600	0.29	3,100
Square foundation	2	2,390	0.20	31,500
Base	1.5	2,200	0.20	30,000
Lining	0.6	2,500	0.20	38,000