Table 6 Distribution of CO in the tunnel stable region (x > L).

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

Condition

Distribution function(t ≤ t0)

Condition

Distribution function(t > t0)

1

(3.48E−07t − 1.55E−04)x2 + 0.0400x − 0.02131t − 1.6956

1

0.028428x − 0.0239t − 0.22024

2

(4.26E−07t − 1.75E−04)x2 + 0.0383x − 0.02268t − 3.3511

2

0.028602x − 0.02373t − 2.46298

3

(2.09E−07t − 1.12E−04)x2 + 0.0394x − 0.02538t − 0.7433

3

0.028602x − 0.02373t − 2.46298

4

(4.04E−07t − 1.74E−04)x2 + 0.0375x − 0.02249t − 0.9689

4

0.028856x − 0.02392t − 0.07681

5

(4.71E−07t − 1.83E−04)x2 + 0.0365x − 0.02185t − 1.0107

5

0.028856x − 0.02373t − 0.09139

6

(3.54E−07t − 1.55E−04)x2 + 0.0363x − 0.02702t − 0.00305

6

0.029138x − 0.02373t − 0.07268

7

(3.15E−07t − 1.60E−04)x2 + 0.0410x − 0.02646t − 0.1722

7

0.02944x − 0.02390t − 0.02997

8

(2.88E−07t − 1.32E−04)x2 + 0.0446x − 0.0305t − 2.25

8

0.02777x − 0.02049t − 0.77806

9

(3.25E−07t − 1.65E−04)x2 + 0.044x − 0.0301t − 0.68306

9

0.03296x − 0.02403t − 1.3997

10

(4.56E−07t − 2.02E−04)x2 + 0.03628x − 0.024t − 0.03315

10

0.02958x − 0.02405t − 0.19085

11

(4.33E−07t − 2.10E−04)x2 + 0.0363x − 0.0218t − 0.0436

11

0.02469x − 0.0203t − 2.4939

12

(4.59E−07t − 2.25E−04)x2 + 0.0301x − 0.0181t − 1.0500

12

0.02888x − 0.01438t + 0.05327

13

(4.06E−07t − 2.11E−04)x2 + 0.0352x − 0.022t − 0.122

13

0.0281433x − 0.01961t + 1.30301

14

(3.66E−07t − 3.66E−04)x2 + 0.04559x − 0.02935t − 0.8474

14

0.029384x − 0.02792t − 0.63294

15

(3.20E−07t − 1.60E−04)x2 + 0.04793x − 0.02816t − 2.11955

15

0.029384x − 0.03251t − 0.76937

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