Self-Tuning Inference Model for Settlement in Shield Tunneling: A Case Study of the Taipei Mass Rapid Transit System’s Songshan Line

Table 1

Descriptions of factors in the dataset.

Variable	Factor	Type	Description
	Shear strength of soils	Input	The strength of the soil and its resistance to deformation
	Groundwater level	Input	The level at which the soil is saturated
	Depth of tunnel center line	Input	The distance between the tunnel center line and the soil surface
	Tunneling distance	Input	The distance of the segmental joint set in the shield tunnel
	Chamber pressure	Input	The pressure applied to counterbalance the lateral earth
	Total thrust force	Input	A reactive force exerted on the shield tunneling
	Tunneling speed	Input	The speed of the cutting head on total torque
	Backfill quantity	Input	Amount of material diffused behind the segmental lining
	Quantity of excavated soil	Input	Amount of soil excavated during the tunneling process
	Water pressure	Input	The pressure of the water distributed on the tunnel wall
	Settlement	Output	Subsidence due to tunneling activity