Influence of Sublevel Unloading Excavation with Deep Consideration of the Superposition Effect on Deformation of an Existing Tunnel under an Intelligent Geotechnical Concept

Table 1

Calculation parameters of the soil layer.

Soil type	Thickness (m)	Bulk modulus (MPa)	Shear modulus (MPa)	Density (kg/m^3)	Cohesion (KPa)	Friction angle (°)
Miscellaneous fill	2.2	5	3.2	1700	10	8
Plain fill	4.9	12.5	5.0	1860	21	10
Silt	13.8	16.0	8.6	1950	12	18
Clay	10.5	18.6	9	1960	75	22
Medium weathered limestone	8.6	840	490	2300	240	37