A Novel Method for Analyzing the Factors Influencing Ground Settlement during Shield Tunnel Construction in Upper-Soft and Lower-Hard Fissured Rock Strata considering the Coupled Hydromechanical Properties

Table 1

Model material parameters.

Stratum	Elastic modulus E/MPa	Cohesion c/kPa	Internal friction angle /(°)	Poisson’s ratio	Density /(kg/m^3)
Plain fill	10.5	10	20	0.30	1836.73
Silty clay	20	30.3	15.2	0.35	2000
Coarse sand~gravel sand	30	0	38	0.30	2091.83
Moderately weathered rhyolite	12000	1300	33	0.22	2551.02
Slightly weathered rhyolite	25000	6000	48	0.15	2663.26
Segment	27600			0.2	2500
Shield tail	21000			0.3
Equivalent circle zone	10			0.2