Table 2 Related physical parameters in the model.
parameter | Parameter name | Parameter value |
|---|---|---|
E | Elastic modulus of rock beam | 8.0 × 109 Pa |
h | Buried depth | 300 m |
L0 | Half length of goaf | 20 m |
Ls | Length of plastic coal range | 4 m |
L1 | Undamaged coal stress concentration zone range | 3 m |
L2 | Range of original rock stress zone | 300 m |
k | Elastic foundation coefficient of coal body in the original rock stress zone | 1.0 × 105 kN/m3 |
ks | Elastic foundation coefficient in plastic zone | 0.8 × 105 kN/m3 |
γ | Overburden rock volumetric weight | 25 kN/m3 |
q0 | Load at the working face | 1.5 × 104 kN/m |
q1 | Load at peak | 3.5 × 104 kN/m |
q2 | Original rock stress load | 2.5 × 104 kN/m |
qL | Load in the middle of the goaf | 0.3 × 104 kN/m |
