SP22.13330.2016
This solution is based on Russian standard SP22.13330.2016, which has two approaches for the calculation of soil bearing capacity:
1) Service resistance (R)
where: | γc1, γc2 | - | |
k | - | k = 1 if the strength characteristics are determined by the direct tests, or k = 1.1 (taken from the tables of Annex A) | |
Mγ, Mq, Mc | - | ||
kz | - | kz = 1 if b < 10 m, else kz = 8/b+0.2 [m] | |
b | - | width of foundation | |
γ1, γ2 | - | unit weight of soil above/below the footing bottom | |
c | - | cohesion of soil | |
d1 | - | depth of the footing bottom |
Note: Parameters φ, c, γ2 are taken as weighted average to the depth of zSP, where zSP = b/2 if b < 10 m, else zSP = 4+0.1b [m]
2) Bearing capacity (N)
kde: | γc | - | |
γn | - | coefficient of reliability (γn = 1.2; γn = 1.15; γn = 1.1 for structures with level of responsibility I, II, III) | |
Nγ, Nq, Nc | - | ||
sγ, sq, sc | - | shape factors | |
bef | - | effective width of foundation | |
γ1, γ2 | - | unit weight of soil above/below the footing bottom | |
c | - | cohesion of soil | |
d | - | depth of the footing bottom |
Note: Parameters φ, c, γ2 are taken along the Prandtl slip surface.
Literature:
SP22.13330.2016.