What are Deformation Monitoring Surveys?
Deformation Monitoring Surveys are a systematic process of measuring and analysing the changes in position of natural or man-made features over a period of time to detect movement, displacement, or structural deformation.
This type of survey utilises high-precision instrumentation such as total stations, laser scanners, digital micrometers, extensometers, and tilt sensors to observe, record, and interpret spatial changes to the millimetre. This allows us to assess structural integrity and associated risks, and provide data for engineering analysis, construction management, or early-warning systems. Deformation monitoring surveys can be continuous (real-time), providing information remotely, or periodic. Deformation surveys are commonly applied in contexts such as historic building preservation, tunnel construction, bridge maintenance, and tall building performance.
When do I need a Deformation Monitoring Survey?
A deformation survey is appropriate wherever it is necessary to record and quantify the extent to which an asset may be moving. The frequency of visits will be determined by the level of risk involves, for example low risk movement may merit only monthly visits, whereas a high risk asset may require automated motorised Total Stations or wireless tilt-sensors reporting 24/7 in real-time.
The requirement for a monitoring survey is usually triggered by one of three scenarios:
- Construction risk: when new works pose a risk to existing structures
- Structural failure (pathology): in the case of subsidence, retaining wall failure, or movement in historic buildings
- Statutory compliance: in the case of Party Wall works or in the case of a Licence to Alter.
Deliverables
Deliverables will include:
- Detailed reporting
- Monitoring data to an agreed schedule – a record of change in the form of coordinate spreadsheets or similar
- In the case of real time monitoring – live cloud-based reporting
- Photographic schedules
