Prediction of Surface Settlement Induced by Large-Diameter Shield Tunneling Based on Machine-Learning Algorithms

Table 3

Parameters of the prediction model.

Data	Type	Variable
Input	Equipment parameter	Grouting pressure, sludge sump pressure, grouting quantity, rotating speed cutterhead, total thrust, propulsion speed, slurry delivery density, sludge density, air cushion chamber pressure, slurry delivery flow, sludge discharge, penetration, cutterhead torque (13 in total)
	Geological parameter	Internal friction angle, cohesion
	Geometric parameter	Cover depth
	Date parameter	Date
Output	Settlement parameter	Surface settlement variation