[Retracted] Application of Internet of Things Based on Wireless Sensor in Tunnel Construction Monitoring

Table 2

Pressure test frequency.

Excavation time	Frequency
1 ~ 15 d	1 ~ 2times/d
16~30 d	1/2 d
1 ~ 3 m	1 ~ 2 times/w
>3 m	1 ~ 3 times/m