Vibration Response Characteristics of the Cross Tunnel Structure

Table 2

Boundary parameters.

Soil layers	Coefficients of spring stiffness			Viscous parameters
	(kN/m^3)	(kN/m^3)	(kN/m^3)	(kN⋅s/m)	(kN⋅s/m)
Plain fill	19980	26310	/	830	497
New loess	15214	18076	/	968	559
Improved soil	58591	77156	/	1834	981
Old loess	16221	22169	/	1014	585
Silty clay	20857	27486	12402	1268	768