GWALL analyses a wide range of retaining wall problems including gravity walls and cantilever walls with a base.

Methods of Analysis
GWALL carries out two types of analysis within the one program:

Limit equilibrium analysis for calculating factors of safety against sliding and overturning.
Calculation of bending moments and shear forces in the stem and base (including the effect of earth pressures due to compaction).

Wall Geometry
A wide variety of wall geometries can be analysed including variable heel and toe width, battered front and back faces and a shear key at any position.

Soil Properties
Up to 20 soil strata may be defined. For each stratum the following parameters may be specified:

Density
Friction angle and cohesion
Earth pressure due to compaction
Earth pressure coefficients

The program will, if desired, calculate earth pressure coefficients from values of soil friction, wall friction, batter angle and backfill angle given by the user.

Water Pressures
Hydrostatic or non-hydrostatic water pressure profiles may be defined on both sides of the wall.

Applied Loads and Surcharges
Surcharges may be specified to act on or below the ground surface on the active side.

Vertical, horizontal and moment loads may be applied to the top of the wall. Horizontal and vertical components of anchor load may be applied to the face of the wall.

Units
Data may be entered in any consistent set of units e.g. (kN,m), (lb,feet). All print-out from the program is automatically annotated in the appropriate units.

Output
Printed output from the program consists of the input data followed by details of the forces, factors of safety, wall pressures, bending moments and shear forces.

Interactive graphics
Graphical display of the data shows the shape of the wall, the soil profile, ground water levels, applied loads and anchor position (if present).

In the Windows version the data can be edited interactively.

Results are displayed in the form of bending moment, shear force and wall pressure diagrams.