Research Article
Optimization of Indirect Fracturing Process Parameters Based on Mechanical Properties of Fractured and Low-Permeability Coal
| | | (%) | E0 (GPa) | μ | η1 | η2 | η3 | Ψ (°) | σb0/σc0 | Kc | σUTS | δ | εmin | εmax | kmin (10−6 ms−1) | kmax (10−6 ms−1) | | Coal matrix | 8.9 | 1.61 | 0.3 | −0.4 | 8.6 | 0.5 | 20 | 2.0 | 0.667 | 0.1 | 0.1 | 0.012 | 0.016 | 0.03 | 52 | | Roof | 7.9 | 6.58 | 0.2 | −0.1 | 10 | 0.1 | 28 | 1.5 | 0.667 | 4.70 | 0.1 | 0.008 | 0.01 | 0.01 | 87 |
| | | En (GPa) | Ess (GPa) | Ett (GPa) | (MPa) | (MPa) | (MPa) | T0 | sn (10−4m) | sS (10−4m) | sn,p (10−4m) | sS,p (10−4m) | | Coal discontinuity | 0.98 | 1.83 | 1.83 | 0.67 | 1.06 | 1.06 | 1 | 3.2 | 5.9 | 0.61 | 1.78 |
| | | Β | γ | χn | χS | Gn (N/m) | GS (N/m) | m | n | Γn | ΓS | l/m3 (s·MPa) | | Coal discontinuity | 3.56 | 3.36 | 0.19 | 0.29 | 57.74 | 343.05 | 0.3 | 0.94 | 2.72 | −1132.5 | 1.2 × 10−10 |
|
|
