GGU-STABILITY: Preface

The GGU-STABILITY program system allows slope failure investigations according to German Standard DIN 4084, DIN 4084:1996 and DIN 4084:2009, using circular slip surfaces (Bishop) and polygonal slip surfaces (Janbu, General Wedge method and Vertical slice method). Furthermore, it is possible to investigate soil nailing and reinforced soil walls. The formulas and relationships given in DIN 4084 are used (see "Theoretical principles").

The fundamentals of analysis using partial factors are given in EC 7/DIN 1054:2010. DIN 4084 contains the calculation procedures (Bishop, Janbu, General wedge method, etc.).

For bending design of the concrete shell according to EC 2, it is possible to export data to the GGU-SLAB program. Verification of punching according to EC 2 is implemented in the program module.

As a speciality, pore water pressure can be entered using not only the usual pore water pressure line, but also using a pore water pressure mesh. With a pore water pressure mesh, complicated flow conditions in a slope can be exactly modelled and taken into consideration for stability calculations. An interface to the groundwater program GGU-2D-SSFLOW is provided.

In 1996 Kölsch developed a constitutive equation for the analysis of slopes in waste materials (see 'The impact of fibrous constituents on the shear strength of domestic waste', Memoranda of the Leichtweiß Institute for Hydraulic Engineering at the TU Braunschweig, Bulletin 133/96 (Der Einfluss der Faserbestandteile auf die Scherfestigkeit von Siedlungsabfall). Mitteilungen des Leichtweiß-Instituts für Wasserbau der TU Braunschweig, Heft 133/96)). This constitutive equation is implemented in GGU-STABILITY as the "Kölsch method" and can be activated for the corresponding analysis. The theoretical principles are described in the section "General notes on analysis with fibre cohesion", further literature can be found in Section “Literature”.

The influence of vibrodisplacement compaction after Priebe can be investigated. It is also possible to include existing jointing. Moreover, you can have your system analysed using stabilisation columns after Neidhart/Gömmel.