Upheavel Check according to Chinese Standard
This verification follows the Prandtl analysis of foundation soil bearing capacity.
Upheavel check scheme - Prandtl slip surface
Verification is done using a safety factor approach and follows formulas:
where: | SFu | - | safety factor of upheaval |
γm1 | - | weighted average value of the soil unit weight behind the structure | |
γm2 | - | weighted average value of the soil unit weight in front of the structure | |
ld | - | embedded depth of the structure | |
h | - | depth of the foundation pit | |
q0 | - | uniform load on the terrain | |
Nc, Nq | - | coefficients of bearing capacity | |
c, φ | - | cohesion and internal friction angle of soil below the bottom of structure |
Note: If there are more several layers of soil below the bottom of the structure, the software calculates the safety factor of upheaval for every layer. Depth of layer from the ditch bottom (D) is used instead of embedded depth (ld) .
Principle of the verifciation in case of a layer in a depth D
Literature: JGJ 120-2012