News & Insights

GeoSEA XVI Geosciences Congress

The Regional Geoscience Congress of Southeast Asia (GEOSEA) 2021, a virtual scientific conference which was held in early December. This year’s convention provided a venue for geoscientists to share and discuss current perspectives and latest innovations from the various fields of the geosciences including energy and resources, geohazards and tectonics, among others.

On show at the conference was our broad Geotechnical capability with presentations on behalf of our teams based around the Asia Pacific Region. The presentations exhibited our innovations and expertise in the field of geotechnics to an international audience.

Our Geosciences team presented on two different topics they are dealing with each day around the stability of slopes.

A Comparison of 2D and 3D Slope Stability Analyses of Road Embankments

Authored by: Jan Christian Valencia and Adrian Kho

The paper investigates the discrepancy between the critical Factors of Safety (FoS) that are obtained from two- and three-dimensional LE techniques by considering variations in surcharge load configuration, slope gradient, embankment height, and material strength parameters. The results of this parametric study show that for the same slope, three-dimensional analyses would produce higher FoS than two-dimensional LE calculations, with variations reaching as high as 40%.  The results of this study assert the significance of performing three-dimensional slope stability analyses on road embankments to achieve potential cost savings on projects.

Utilization of Remotely Piloted Aircraft (RPA) in supplementing slope stability assessments

Authored by Lizalyn Giezelle Cadeliña, Adrian Kho, Trudie Bradbury and Amy Steiger

Cardno has experimented with the integration of RPA for photogrammetry and 3D modelling to assist geotechnical risk assessment works at several project sites. Investigations and surveys conducted via RPA are utilized alongside traditional on-site slope assessment methods as an innovative approach in geotechnical data acquisition and design of remedial measures. Oblique photography assessments, which entails the acquisition of oblique images using multi-rotor RPA for steep areas, are used to produce high-resolution orthophotography and 3D models. The resulting aerial imagery and model can then be interrogated to identify potential hazards which are not noted during visual inspection or where large areas are required to be examined efficiently. This also provides an alternative avenue of investigation on inaccessible or potentially hazardous areas without compromising the safety of personnel.

The paper highlights the potential use of RPA in the field of engineering geology and geotechnics and how this can provide innovative means to improve and supplement traditional site-based assessment works. Remote inspection also leverages the safety capabilities of RPA to enable high-quality data acquisition on areas where traditional methods are unfeasible. The use of RPA on other relevant assessments to provide imagery and mapping means (rockfall assessment) and rehabilitation works (mining) are also discussed.

The RPA presentation is a great example of team members working together and collaborating to achieve a common goal, no matter their geography – the authors are based in Manila, Wollongong, Mackay and Brisbane. A true example that our teams can work together wherever they are located.

Cardno, now Stantec’s Geosciences team have the capability and resources across the Asia Pacific region to complete a variety of tasks with the latest technology.

For more information contact:

Andy Williams
Business Leader - Geosciences

Adrian Kho
Team Leader - Geosciences Brisbane