Research Article
Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
Table 2
Parameters of the rock layers.
| | Lithology | Density (kN/m3) | Tensile strength (MPa) | Internal friction angle (°) | Cohesion (MPa) | Bulk modulus (GPa) | Shear modulus (GPa) |
| | Fine sandstone | 23 | 7.3 | 28 | 1.0 | 3.81 | 3.05 | | Medium sandstone | 24 | 8.4 | 32 | 2.6 | 11.49 | 7.26 | | Siltstone | 22 | 4.3 | 28 | 0.8 | 2.11 | 1.86 | | Middle conglomerate | 26 | 10.2 | 35 | 3.3 | 14.16 | 9.21 | | Coal | 13 | 3.3 | 29 | 0.2 | 0.35 | 0.18 | | Coarse sandstone | 25 | 9.6 | 33 | 2.9 | 13.21 | 8.75 |
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