A Consolidated Earth Pressure Model for Geotechnical Stability Design of Embedded Cantilever Walls-PPT Presentation

PPT Presentation

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The presentation introduces a consolidated “WYDIWYG” earth pressure model for designing the embedment of propped and free cantilever walls. It addresses shortcomings in conventional approaches, including inconsistent stability assessments, uncertainty about applying the geotechnical strength reduction factor (φg), and limitations in calculating embedment.<br /><br />The model is based on two principles: the maximum driving factor above the limiting-equilibrium design condition provides a consistent benchmark for stability; and ground pressures below that condition are treated as effective resistances. This approach defines how φg is applied under Australian Standard AS 5100.3 and supports both rotational and horizontal-force equilibrium checks.<br /><br />The presentation compares the model’s performance for a 5 m-high wall using effective- and total-stress analyses, and illustrates its application to a free cantilever wall designed to AS 5100.3. The authors describe the model as applicable across a wide range of soil strengths and suitable for both free and propped walls, as well as other laterally loaded structures.<br /><br />The proposed method is intended to provide a rational, consistent basis for determining limiting embedment, balancing safety and economy. The presentation notes that this embedment is a starting point for subsequent serviceability design, rather than a replacement for it, and suggests the approach could be adapted to other design standards.

Keywords

earth pressure model

WYDIWYG

embedment design

propped walls

free cantilever walls

geotechnical strength reduction factor

AS 5100.3

limiting equilibrium

soil stability

laterally loaded structures