Study of Tunnel Damage Caused by Underground Mining Deformation: Calculation, Analysis, and Reinforcement

Table 2

PIM parameters used in calculation.

Excavation time	Coal seam	q	b
October 2008–October 2010	All	0.07	0.23	1.40
After October 2010		0.7	0.23	1.40
After October 2010		0.77	0.23	1.40