Standard Analysis
The bearing capacity of foundation soil composed of rocks or weak rocks is found from the expression proposed by Xiao-Li Yang and Jian-Hua Yin1:
where:
where: | s | - | nonlinear parameter depending on rock properties (according to Hoek and Brown) |
GSI | - | Geological Strength Index | |
D | - | coefficient reflecting damage of a rock mass | |
Nq, Nγ | - | coefficients of bearing capacity depending on the angle of internal friction | |
Ns | - | coefficient of the strength of rock depending on GSI and strength parameter mi | |
φ | - | angle of internal friction of the rock | |
σc | - | uniaxial compressive strength of rock > 0,5 MPa | |
q0 | - | equivalent uniform load accounting for the influence of foundation depth | |
γ2 | - | unit weight of soil above the footing bottom | |
b | - | width of foundation |
1 Xiao-Li Yang, Jian-Hua Yin: Upper bound solution for ultimate bearing capacity with a modified Hoek-Brown failure criterion, International Journal of Rock Mechanics & Mining Sciences 42 (2005),str. 550-560.