Research Article
Calculation Method of Underground Cavern Loosening Pressure Based on Limit Analysis Using Upper-Bound Theory and Its Engineering Application
Table 2
Physical and mechanical parameters of the rock mass of Zhifang tunnel.
| | Surrounding rock category | Elastic modulus ES (GPa) | Poisson’s ratio | Lateral pressure coefficient | Cohesion (KPa) | Internal friction angle (o) | Bulk weight γ (kN/m3) |
| | Strongly weathered carbonaceous slate | 0.8 | 0.40 | 1.0 | 55 | 20 | 17.5 | | Moderately weathered carbonaceous slate | 3.0 | 0.31 | 1.0 | 135 | 30 | 23.5 |
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