[Retracted] Engineering Application of Nanomaterial and Ferroelectric Domain Polarization to the Dynamic Structure of the Surrounding Rock of Heavy-Duty Railway with Small Clear Intersection Tunnel

Table 1

Comparison of various train parameters.

Train type	Gross weight (t)	Train axle load (t)
Subway	15	650
High-speed rail	19	1300
Heavy-duty train	75% more than the subway	13 times the subway
	40% more than high-speed rail	6 times of high-speed rail