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Modules add speed and safety

CADS' Piled Wall Suite, first launched in 1996, was developed to assist experienced engineers in designing and drawing embedded retaining walls and cofferdams. Embedded walls are defined as retaining walls that rely on their embeddment into the ground to provide stability. The structural form may be either cantilever or tied/propped at one or more levels. This form of wall includes sheet piles, bored piled walls, diaphragm walls and king pile walls.

There are now four modules that make up PWS. Module 1 is for stability analysis of embedded, propped and cantilever walls, to determine pile length, factor of safety and moments and shears for section design.

Module 2 is for wall design, providing structural design for steel sheet piles, steel king piles with timber lagging, contiguous and secant bored piles and diaphragm wall sections. Module 3 is used to design the steel framing for cofferdams, and the new slip circle analysis module completes the suite.

As well as the new module, the latest version incorporates several new features and enhancements as a result of comments from users and builds on Version 2, released at the end of last year, when deflection calculations were added to the program.

'The slip circle analysis module for assessing the factor of safety of slope profiles surrounding piled walls is another feature requested by users,' says CADS technical director Bob Hairsine.

The new module allows engineers to check the overall stability of a design, whereas the basic embedded wall analysis incorporated in the existing software is used to ensure that wall stability is achieved by not exceeding the limiting passive resistance of the soil.

CADS says the latest addition is designed to be used after the designer has first carried out the basic analysis. The module carries out an analysis of a set of slip circles automatically as the program is started, using default data for the analysis if none is specified. Users can then alter the data to further investigate the overall stability of the wall.

The company adds that the new module is not intended to replace general slip circle analysis software. However, it claims that its use will reduce the time of such an analysis from several days to a few minutes. This, it says, will encourage designers to perform this check, which it claims is otherwise frequently neglected by wall designers. It adds that there may be a need to check further slips below the toe of the pile in another software package if the design incorporates layered soils.

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