The Influence of Hydraulic Conditions on the Stability of Dual Circular Tunnels in Unsaturated Soils

Table 1

Hydraulic parameters of different soils.

Soil type	n	(kPa^−1)	ks (m/s)
Silt	1.38	0.18	5e − 7
Clay	1.13	0.06	5e − 8
Sand	2.67	1.50	3e − 5
Sandy clay	1.28	0.28	1e − 7