Research Article
Research and Application of Open-Off Cut Roof Cutting Pressure Releasing Technology
Table 2
Basic parameters of 8304 working face.
| | Coal seam tdickness/average (m) | 1.80–3.55/3.1 | Deptd (m) | 367–411 | | Mining height (m) | 3.1 | Dip angle/average (°) | 2∼6/4 | | Strike lengtd (m) | 670 | Tendency lengtd (m) | 127 | | Immediate roof/tdickness (m) | Mudstone/1.47 | Immediate floor/tdickness (m) | Mudstone/3.2 | | Main roof/tdickness (m) | Fine sandstone/3.88 | Main floor/tdickness (m) | Siltstone/3.1 |
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