Alluvial Geology of North-West Sydney and its Impact on Development

Somerville, Jarrod (2021) Alluvial Geology of North-West Sydney and its Impact on Development. [USQ Project]

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SOMERVILLE Jarrod dissertation_redacted.pdf

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Gravel, sand, silt and clay sediments were transported by an ancestral Hawkesbury-Nepean River system and deposited at various heights above the river forming river terraces and plains that make up the landscape of North-West Sydney that we know today. This region is one of the last remaining underdeveloped areas of Greater Sydney. However, with Sydney’s rising population this region will need to be heavily developed in the coming years.

Alluvial soils can cause a myriad of problems for developments, both during and post construction. Typical problems can include, low bearing capacity in soft clays or loose sand, excessive shrink-swell distortions due to highly reactive soils, seasonal waterlogging, soil aggressivity to buried concrete and steel structures and the risk of acid sulfate soils.

This study is intended to classify engineering properties of the alluvial geological units found in the north-western region of Sydney and create a template for conducting geotechnical investigations in the area. For this purpose, several engineering reports, research and journal articles, standards and government databases were studies in detail.

The main engineering properties examined include consistency/density, plasticity, moisture conditions, permeability and soil aggressivity. Discussions are made regarding groundwater flows and fluctuations, excavation conditions, slope stability, shallow and deep foundation designs and the potential of acid sulfate soils.

It was discovered that all of the studied alluvial units display a high variability which can lead to further complexity for developments.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Mirzaghorbanali, Ali
Qualification: Bachelor of Engineering (Honours) (Civil)
Date Deposited: 03 Jan 2023 04:47
Last Modified: 26 Jun 2023 02:45
Uncontrolled Keywords: sediment, geology, alluvial, soil, Sydney, Hawkesbury-Nepean, properties, groundwater

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