Table 3 The main factors affecting safety time.

From: Study of harmful gas migration law and influencing factors after tunnel blasting in high-altitude tunnels under push ventilation conditions

Condition

Y0/s

Y1/km

Y2/m

Y3/m3 s−1

1

433

0

30

38

2

439

1

30

38

3

431

2

30

38

4

451

3

30

38

5

452

4

30

38

6

446

5

30

38

7

450

6

30

38

8

498

3

20

38

9

431

3

25

38

10

449

3

35

38

11

465

3

40

38

12

746

3

30

22.8

13

598

3

30

30.4

14

364

3

30

45.6

15

307

3

30

53.2

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