Geofem is a consultancy experienced in ground movement prediction and soil-structure interaction analysis using finite element analysis (FEA) for a wide range of projects across the globe. We are also experts at ground and structural movement measurement by radar satellite images using the latest linear and non-linear data analysis techniques. Our unique combination of expertise allows us to select the most appropriate analysis techniques for geotechnical and structural applications and to provide informed interpretations of radar satellite data.
Old War Office redevelopment
GEOFEM performed a 3D finite element analysis of the proposed basement construction to predict deflections in the Grade II* listed building and to support the structural engineers in the design of the sub-structures, piled foundations and permanent dewatering.
Barts Square Development
A 3D finite element analysis was performed of the raft foundations to two buildings in this large redevelopment to predict settlements (including critical party wall settlements) and to provide structural forces and coefficients of subgrade reaction to support structural design of the raft foundation.
Battersea Dogs and Cats Home
A 2D finite element analysis was performed to predict the future effects of construction of the Northern Line extension on the basement to the new Tealby Building and check that the design of the basement wall accommodated these effects.
Westgate Shopping Centre redevelopment
Finite element analyses were performed of the existing and new foundations and basements to predict ground movements in particular between existing and proposed parts of shopping centre, and to provide subgrade reaction coefficients to support structural design of the raft foundations. Groundwater flow analyses were also undertaken to support the design of the permanent basement dewatering.
GEOFEM performed a large pile group settlement analysis using 3D finite element analysis to predict differential settlements between The Tower and adjacent lightweight buildings as well as those resulting from re-use of under-reamed bearing piles and loading of new straight-shafted piles during the redevelopment.
A ground movement analysis was performed for the proposed New Marlborough School development in Chelsea, London to predict the deflection of an underlying relief sewer and to support structural design of the substructures.
Douglas Park New South Wales, Australia
Geofem conducted a Synthetic Aperture Radar (SAR) Interferometric survey for the greater area surrounding Douglas Park for ground stability monitoring purposes during mining activity. Ground displacement was identified (areas in red) coinciding with the mining operations. Ground displacement estimates from satellite radar analyses were in agreement with in situ surveying data.
Spaceborne radar is a popular source of data for pollution surveying, particularly for oil spills. Radar data offers the capability of monitoring oil discharges from ship traffic and offshore operations in a weather and cloud coverage independent manner enabling continuous tracking information.
South West coastline of the Isle of Wight
Geofem conducted an Interferometric survey using Synthetic Aperture Radar in the SW coast of the Isle of Wight, UK. The primary study area is the Roughlands Landslide located south of Brook village. A set of 40 Sentinel-1 scenes for the period between January 1st, 2017 and December 21st, 2017 were acquired and processed to determine the ground movement along the coastline. The Small Baseline Subset (SBAS) Interferometric Stacking technique was applied.
Fujairah – Dubai Freeway
Geofem was commissioned to perform an interferometric analysis of the Fujairah Freeway which connects Dubai in the west to Al Fujairah on the east coast in the United Arab Emirates, using satellite Synthetic Aperture Radar data. Analyses were performed using Persistent Scatters covering the period between December 2014 to November 2018. Displacement estimates were decomposed into vertical and horizontal directions.
Monitoring of Dams
Geofem performed Persistent Scatterer Interferometry analysis (PSI) on Kourris Dam in Cyprus. Dams are generally good scatterers giving highly accurate displacement results. Analysis between 2014 and 2018 showed movements matching those obtained at discrete points by in situ measurements. The big advantage with the remote PSI technique is that many points can be monitored, at regular intervals (every 6 days) at very low cost compared with in situ monitoring.
Monitoring of Infrastructure
Satellite data can help to monitor large urban areas for ground movement, mapping and land cover changes using change detection techniques. Critical infrastructure monitoring using satellites has become more and more popular for both economic and safety reasons. At Geofem we apply different techniques for monitoring the movement of buildings and infrastructure.