Table 1 Experimental specimen parameters.
Specimen number | Combined models | Coal seam strength ratio | Triaxial in-situ stress (MPa) | Water injection flow (mL/min) | ||
|---|---|---|---|---|---|---|
\({\sigma }_{H}\) | \({\sigma }_{h}\) | \({\sigma }_{v}\) | ||||
Scheme 1 | Rock–coal–rock | Zone 1: Zone 2: Zone 3 = 1.03:1.05:1 | 3.3 | 3 | 2.1 | 80 |
Scheme 2 | Rock–coal–rock | Zone 1: Zone 2: Zone 3 = 1:1:1 | 3.3 | 3 | 2.1 | 80 |
Scheme 3 | Rock–coal–rock | Zone 1: Zone 2: Zone 3 = 1.05:1:1.03 | 3.3 | 3 | 2.1 | 80 |
