Pore Water Pressure Responses in Sand Stratum during Shield Tunnelling: A Case Study

Table 1

Parameters of the finite element model.

Number	Unit weight	Elasticity modulus	Poisson ratio	Cohesion	Friction angle	Void ratio	Permeability coefficient
	kN·m^−3	E (MPa)	Ν	c (kPa)	(°)	e	k (m/s)
1	18.9	25	0.35	10	30	0.69	2.06e − 4
2	23.5	256	0.29	185	32	0.54	1.88e − 6
3	24.3	2200	0.25	1200	38	0.43	5.75e − 7
4	25.0	34500	0.2	—	—	—	1.0e − 13

(1) fine sand; (2) highly weathered conglomerate; (3) medium-weathered conglomerate; (4) concrete segments.