Variation of Rock Mass Pressure during Tunnel Construction in Phyllite Stratum

Table 1

On-site monitoring measurement project and method of the Mingyazi tunnel.

Number	Monitoring content	Instrument	Monitoring frequency
1	Clearance convergence	TOPCON (OS-600G) total station	1–15 days	1-2 times/day
			16 days-1 month	1 time/day
			1 month later	1-2 times/week
2	Crown settlement	TOPCON (OS-600G) total station	1–15 days	1-2 times/day
			16 days-1 month	1 time/day
			1 month later	1-2 times/week
3	Rock mass pressure and contact pressure	Pressure sensor	1 time/day