Table 2 Physical and mechanical properties of rock.

From: Failure control of large-scale exposed tunnels under the combined effects of excavation damage and dynamic disturbance at a depth of 1240 m

Number

Disturbance times

Amplitude(MPa)

Frequency(Hz)

Density(kg·m-3)

Wave velocity

(m·s-1)

Peak strength(MPa)

1240–1-1

3000

8

20

2643.13

4267.22

297.43

1240–1-2

3000

8

20

2,654,031

4267.22

1240–1-3

3000

8

20

2684.55

4302..58

1240–2-1

3000

14

20

2678.19

4365.81

276.34

1240–2-2

3000

14

20

2635.78

4289.57

1240–2-3

3000

14

20

2684.95

4199.65

1240–3-1

3000

20

20

2677.24

4275.59

252.57

1240–3-2

3000

20

20

2689.14

4249.36

1240–3-3

3000

20

20

2685.42

4219.63

Back to article page