Novapoint GS Spont
| • Combine total stress soil models in layers | • Database |
| • Graphical presentation of input and result | • Re-calculation for variation |
| • Step by step of excavation phases | • Editable phase definition setup |
The user interface
The user interface is designed to be very easy to use. It consists of panes, representing logical steps within the calculation process. The result is presented in both tabular and graphical views.
Soil models
Effective- and total stress soil models are available. These can be chosen as “automatic”, calculating the limiting earth pressures according to well-established equations, or you can choose to specify the limiting pressures more directly. This gives a total of four different soil models to use. The actual earth pressure between the limits is found through a non-linear displacement stiffness relationship. The stiffness formulation comprises unloading/reloading qualities generating hysteresis when load direction changes.
Sheet pile
You can select a sheet pile section from the producer’s product tables directly. Or you can freely define the wall with an E-modulus, moment of inertia and section modulus, varying over depth.
Calculation
After establishing the soil profile and other key information, the analysis is run in a suggest- and approve/reject phase manner. The calculation of phases can comprise:
• Excavation
• Change in water pressure, constant gradient flow, or user defined
• Introduction and pre-tensioning of struts/anchors
• Application of external point loads or loads distributed by depth acting on the wall
The anchor menu gives user assistance in selection of anchor type and pretension force relative to the anchor capacity. This process ends up in a phase definition setup that can be edited for optimisation, or can be re-executed with altered wall length, wall stiffness or changes in soil or other parameters. An optimised wall depth, combination of excavation intervals, anchor pretension etc can thereby be searched. And the sensitivity to changes in other para- meters can easily be investigated.
The approved phase combination is saved, and can be rerun for example for another selection of the sheet pile type or depth etc.
Result
The result from each calculation phase is presented in a dockable graphical view and in tabular views.
A status plot showing the current state of the supported excavation is always shown and can be complemented with graphs showing a number of different results. Graphs by depth for displacement, shear force, bending moment, soil and water pressure, vertical stress or shear mobilization in the adjacent soil as well as the evolution during the phases of some key results can be drawn for both approved and proposed phases. All crucial data for the calculation and the result may be printed out as a report.
