Geotechnical calculation often are complicated by the presence of many different geological layers, each with its own material properties. Information over such layers are available in the form of CAD data, either coming from in-situ measurements or other sources of information. To predict settlements and safety after doing excavations or groundwater level changes, Finite Element calculations are used. However, making a 1D, 2D or even 3D mesh from the complex geometry is an elaborate task when using general purpose pre-processors. For this reason RWE Power, Germany, http://www.rwe.de and FEAT developed a complete set of 1D, 2D and 3D special purpose pre-processing tools enabling fast and flexible conversion of CAD information to Tochnog Professional input files.




Femop1D is a 1d preprocessor. It operates on CAD data for 1 column with geological layers. The graphical environment allows for specification of layers, definition of multiple phreatic levels, switch on/off of consolidation, etc. A complete ready-to-run input file is generated for Tochnog Professional.









Femop2D is a special purpose preprocessor, operating on 2D geological CAD data. In the graphical environment it allows for automatic geology specification, layer detection, definition of faults, multiple excavation, over time changing multiple hydrological levels, etc. A complete ready-to-run input file can be generated for Tochnog Professional.








Femop3D reads in 3D CAD data with geological information from many columns. It allows the user to select a limited region of interest, and also filter the amount of columns to be used. All Femop1D actions are available after choosing a specific column in Femop3D, and all actions taken will be automatically transferred from the specific column to all other columns, such that consistency between columns is maintained. Again multiple phreatic levels changing over time, fault specification in space, consolidation analysis can be required by the user. And again a complete ready-to-run input file will be generated for Tochnog Professional.






experimental pressure frpm cone penetration test





Femopcep determines for Cone Penetration Test experimental data the corresponding initial void ratio pattern. Input of Femopcep are the depth - pressure curve of the Cone Penetration Test, see the picture on the left, and parameters for the hypoplasticity law of the soil. In the background Tochnog Professional is called a number of times in order to establish a polynomial relationship between the initial void ratio and the resulting numerical pressure. Then, given the experimental pressure over the depth, the initial void ratio over the depth is determined by inverse modelling the relationship. Output is the distribution of the initial void ratio. The initial void ratio curve can be used to determine weak material zones, which is relevant to know before starting large scale excavations.











Femopmat generates material data sets for the above Femop programs, taking information from user databases.





... FEAT