The Analysis of Time-Space Effect of Surrounding Rock Deformation of TBM Tunnels in Deep Composite Stratum with or without Support

Table 1

Mechanical properties of the rock.

Sequence number	Lithology	Compressive strength (MPa)	Elastic modulus E (GPa)	Poisson’s ratio	Bulk weight (104 N/m^3)
1	Mudstone	14.3 (2–54)	2.24 (2–20)	0.35	18
2	Siltstone	24 (22–110)	2.5 (1.6–5.3)	0.29	18

The rock parameters were selected from the 1991 edition of the Manual of Rock Mechanics Parameters.