Sydney Metro, together with signalling and infrastructure upgrades across the existing Sydney rail network, will increase the capacity of train services entering the Sydney CBD – from about 120 an hour today to up to 200 services beyond 2024. That’s an increase of up to 60 per cent capacity across the network to meet demand.
The Challenge – Buildings/structural deformation and surface settlement monitoring surveys. The challenge lies within the establishment and maintenance of high precision survey control networks within the zone of influence in a three-dimensional facet, reaching millimetre order (generally 2-3 millimetres)
The Solution –With careful planning and in-depth analysis of each monitoring zones along the project alignment, survey control networks were designed, being composed of first and secondary order networks. These terrestrial networks were designed with principles such as geodetic quadrangles and centralised polygon schemes which allows for long term preservation and repetitive surveys.
The Outcome – As a result of this implementation in the heart of Sydney’s CBD and it’s surrounds, a great deal of understanding and knowledge principles were gained. This includes characteristics such as varying meteorological/atmospheric conditions, natural elastic deformation, heave and subsidence of buildings and pavement surfaces and its effect on a precise survey network.