Advances in Civil Engineering / 2020 / Article / Tab 1

Research Article

Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method

Table 1

The results of in situ stress measurements around the Houziyan underground powerhouse.

No.PointsLocationH-d (m)V-d (m)σ1σ2σ3

1σSPD1-10 + 253 m in SPD1253390Value (MPa)21.3312.066.98
α (°)315.69147.647.32
β (°)21.5368.044.12

2σSPD1-20 + 400 m in SPD1400560Value (MPa)29.0618.4413.85
α (°)290.115.6100.3
β (°)42.5−4.947.1

3σSPD1-30 + 106 m in the lower adit of SPD1400570Value(MPa)28.0722.8516.11
α (°)305.521.2100.4
β (°)47.5−12.839.7

4σSPD1-40 + 525 m in SPD1525780Value (MPa)33.4522.6214.12
α (°)285.3352.973.3
β (°)54.3−15.331.4

5σSPD1-50 + 236 m in the fourth adit of SPD1385576Value (MPa)36.4329.822.32
α (°)319.33.374.7
β (°)44.5−36.223.6

6σSPD9-10 + 250 m in SPD9250440Value (MPa)21.4617.596.2
α (°)286.296.711.1
β (°)47.142.5−4.8

7σSG-10 + 41 m in the 2nd-layer drainage gallery330500Value (MPa)24.6711.044.83
α (°)301.333.5123.9
β (°)67.60.922.4

8σSG-20 + 90 m in the 2nd-layer drainage gallery280480Value (MPa)22.6718.549.65
α (°)288.0169.468.4
β (°)54.219.029.0

9σSG-30 + 59 m in the upstream sidewall of No. 2 tailrace tunnel430580Value (MPa)34.7719.7612.26
α (°)270.0170.562.5
β (°)34.513.552.2

Note: H-d is the horizontal depth of the measured point, while V-d is the vertical depth of the measured point. α is the dip direction of the principal stress and β is the dip angle of the principal stress.

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