Research Article
Prevention and Control Technology for Harmful Toxic Gas Intrusion in High-Fire-Hazard-Risk Areas of Close-Distance Coal Seams
Table 2
SF6 gas sample analysis results.
| | Sampling location | Sampling time | Volume content (×10−6) |
| | 31202 cutting hole 2# drawing off water hole | 12 : 30 | 1.2129 | | 12 : 50 | 1.1048 |
| | 31202 cutting hole 5# drawing off water hole | 12 : 20 | 1.0376 | | 12 : 40 | 1.3867 |
| | 31201 return air roadway joint roadway 26# closed observation hole | 12 : 50 | 2.8301 | | 13 : 00 | 1.6324 |
| | 31201 auxiliary transport roadway joint airway 34# closed observation hole | 12 : 55 | 1.2351 | | 13 : 10 | 1.0235 |
| | 31201 return air corner | 13 : 15 | 1.0630 | | 13 : 35 | 0.9562 |
| | 31201 return air flow | 13 : 40 | 0.1056 | | 14 : 00 | 0.0987 |
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