Application of Distributed Optical Fiber Sensing Technology in the Anomaly Detection of Shaft Lining in Grouting

Table 1

Main aquifers that the shaft crosses.

Layer	Thickness (m)	Aquifer thickness (m)	Aquifer type	Static water level (m)	Estimated water inflow (m^3/h)
The Quaternary	99	50	Confined pore water	+120.52	63.89
Liujiagou group of Triassic sandstone	283	159	Porous-fractured water	+150.28	762.78
The Permian Shiqianfeng formation + first division sandstone	262.5	168.7	Porous-fractured water	+149.38	176.93
The Permian coal stratum	521	122	Porous-fractured water	+90.292	13.47