The Prototype Test on Sealing Capacity and Mechanical Behavior of the Underground Segmental Lining in a Low Vacuum Environment

Table 1

Maximum stress of reinforcing bar at monitoring point.

Monitoring point	Initial frequency f1	Working frequency f2	Stress (kN/m^2)
K2	1460	1453	25.21
2B1	1410	1407	10.98
K2	1805	1796	42.08
1A1	1354	1353	3.50
1A2	1412	1409	10.60
1A8	1333	1330	10.40
1A9	1368	1359	29.88
2A2	1469	1459	35.42
3A2	1448	1446	7.12