Gravity and Cantilever Retaining Wall Analysis Program
GWALL Version 4 for Windows
Copyright Dr D.L.Borin  2023
Distributed by Geosolve, London, UK
Please read this file before installing and running GWALL. It contains important information about the program including recent revisions to GWALL.
____________________________________________________

GWALL Version 4.01   Revision A06.B06.R60                                      August 2023

New features
Gabion Wall Input
The wall geometry can now be entered as a gabion wall, with up to 20 layers of variable height, width and horizontal offset from the toe of the wall. 

Apply Multiple Factor Sets
Revision of partial factors application to allow the definition of limit states, and the application of limit states to each load case allowing ULS and SLS partial factors to be applied to all calculations. This also allows for different load and surcharge types, with different factors applied.

Lateral Equilibrium for Bearing and Bending Calculations
Amended analysis method for bearing pressure calculations, and calculation of shear force and bending moments in the base of stem to ensure lateral loads are in equilibrium.

Multiple Load Sets Supported
Revision of loads applied to wall to allow multiple loads to be defined, with relevant loads selected for each load case. 

Updated Interface for Soil Properties
Revision of soil properties dialog for greater consistency with WALLAP.

Unfactored Soil/Wall Friction 
GWALL now allows the use of unfactored shear angle for friction between the back of wall and/or base, even where other friction angles are factored. This allows the program to represent the use of constant volume friction angles on the soil/wall interface, and/or for the active thrust to act in-line with the backfill gradient.

Support for Virtual Back and Inclined Back of Wall
GWALL models walls using either a vertical virtual back or, where appropriate, the inclined soil/wall interface. 
____________________________________________________

GWALL Version 3.03   Revision A04.B04.R58                                      October 2020

New features
Notes files
An important new facility to enable users to keep track of their data and results.
A Data file can now have an attached Notes file. The Notes filename is chosen by the User and is specified in the Titles section of the WALLAP data. Notes files are fully formatted and can include graphics.  Notes files are intended for recording:
    Aims and objectives of a set of analyses,
    Main assumptions and sources of information,
    Key results, observations and conclusions.
The same Notes file can be shared by several data files.

Help with data input menus
Double-click on any of the Error or Warning messages below the data input menu for further information about the error or warning.

Help feature when viewing results listings
Right-click on blue underlined text to link to the associated Help Topic which gives explanations and interpretation of the output.

Knowledge Base 
The previous collection of Example Data files has been expanded and is now called the Knowledge Base. Data files are linked to an accompanying Notes file (see above). A search facility allows the user to find all data files associated with a group of search key words entered by the user.

File Open Menu - Recently used files 
The option for re-opening recently used data files has been greatly improved. It now offers 2 levels of file history;  the last 15 folders and the last 15 files from within each folder.

____________________________________________________

GWALL Version 3.02   Revision A03.B03.R56                                      March 2019
Improved report generation
____________________________________________________

GWALL  Version  3.02   Revision   A02.B03.R55                                October 2017

Improved, user-friendly copy protection for Network Installations.
Restrictions on dots and spaces in data filenames.
____________________________________________________

GWALL  Version 3.02    Revision  A02.B03.R49                               October 2015
 
ULS resultant labelled                                   
SLS and ULS text in results on graphic display.
SLS / ULS labelling of Summary results 
SLS Contact pressure included in Summary 
___________________________________________________

GWALL  Version 3.01    Revision A02.B03.R39                      19th Decemeber 2010 

Display resultant force arrows on base of wall
____________________________________________________

GWALL Version 3.01     Revision A02.B02.R38                       17th December 2008

Further changes to verification of network installations  
 _____________________________________________________

GWALL Version 3.01     Revision A02.B02.R35                                26th April 2007

Minor changes to verification of network installations    
_______________________________________________________

GWALL Version 3.01     Revision A02.B02.R33                       20th November 2006

Revised data definition
The "Partial Factor of Safety on Passive" (see Analysis Options) is now applied only to the ULS calculations i.e. Factors of Safety.
Calculation of bending moments and shear forces is now done without partially factoring the passive resistance as these forces have been estimated as insitu forces and do not need a significant movement to mobilise them. The results are annotated accordingly.
____________________________________________________

GWALL Version 3.01     Revision A01.B01.R30                                   18th July 2005

First windows version of GWALL

New features
There are some major new features in GWALL 3.01 for windows which were not available in version GWALL 2.42:

1)  All surcharges have an additional parameter which defines the length of the surcharge parallel to the wall.
2)  Load Cases have been introduced. Each load case defines the surcharges which are to be included in the analysis and there are separate load factors for surcharges and the loads applied to the wall. This should enable users to model the various combinations of dead and live loads required by codes of practice.
3)  The Stability and Bending Moment analyses are now described as ULS and SLS analyses. Partial factors can be applied to the soil strength parameters for the ULS analysis.
____________________________________________________________

December 2000   to             July 2005     Version  2.42  A04.B05.R25  
    October 1998  to             July  2000    Version  2.41  A04.B05.R24  
November 1993  to  September  1994    Version  2.41  A02.B03.R11  

November 1993   First DOS version of GWALL 
____________________________________________________________

Dr D.L.Borin  March 2019
Distributed by Geosolve, London, UK