Vertical bearing cap. - Spring method

The "Vertical bearing capacity" frame allows for verifying the pile vertical bearing capacity. The analysis is performed automatically when switching to this frame. More computations can be performed in the frame. The verification can be performed either for individual loads or the program finds the most critical one (can be selected from a combo list)

The analysis is performed with the help of Shear depression spring method. The results are automatically updated whenever one of the analysis parameters "Maximal deformation", "Coefficient increasing limit skin friction due to technology" or "Procedure determining influence zone bellow heel" is changed.

Two options are available to determine influence zone below the heel:

By default the analysis follows the procedure described in the theoretical part of the hint in section "Depth of influence zone".

The second options assumes the depth influence zone to be set a k-th multiple of the pile diameter. During gradual increase of pile surcharge the depth of influence zone is continuously changed from zero at the onset of loading to the k-th multiple of the pile diameter when exceeding the total load.

The second method, originally used in the old version GEO4, with the value of k=2,5 offers less accurate results and usually underestimates the pile bearing capacity. Therefore a new option that allows for specifying the depth of influence zone through analysis is offered and is also recommended by the default setting.

Switching between results is available in the left part of the frame (limit loading curve, distributions of internal forces, dependence of shear on displacement). The shear-displacement relationship is derived for a given depth measured from the pile head. The results are updated whenever the depth is changed.

The "In detail" button opens the dialog window, which contains detailed listing of the results of verification analysis.

Visualization of results can be adjusted in the "Visualization style settings" dialog window.

Frame "Vertical bearing capacity" - Shear depression spring method