APPLICATION • DEMOLITION
Geotechnical & Structural Monitoring for Demolition Projects
Plan demolition with evidence around vibration, structural movement, settlement, cracks, tilt and adjacent assets. GEOUE helps project teams match monitoring methods to the demolition sequence, site geometry and risk profile.
01 / Risk context
Why Monitoring Matters During Demolition
Changing load paths
Breaking, cutting, crushing or removing structural members can redistribute loads and create local deformation. Partial demolition and temporary works deserve particular attention.
Energy reaches beyond the site
Hydraulic breakers, falling debris, heavy plant and compaction can produce transient vibration or ground movement that affects sensitive structures, utilities or equipment.
Existing conditions need a baseline
Condition surveys and pre-demolition readings help distinguish pre-existing cracks or movement from changes observed during the works.
02 / What to measure
What Should Be Monitored?
Ground & geotechnical
SettlementLateral movementPore pressureRetaining wallsUse these where demolition interacts with basements, excavation, retaining systems, soft ground, buried assets or groundwater risk.
Structural response
DisplacementTiltCrack widthStrainTrack response of retained structures, shared walls, temporary supports and sensitive adjacent buildings when the risk assessment calls for it.
Dynamic response
VibrationPPVAccelerationFrequencyDynamic measurements help relate demolition activities to the response of nearby structures, equipment or transport infrastructure.
A survey prism, for example, does not measure the same physical quantity as a tiltmeter. Instrument choice should follow the engineering question, not a generic checklist.
03 / Instrumentation
Typical Demolition Monitoring Instruments
Vibration
Vibration monitor / seismograph: records time-history, PPV and frequency for construction or demolition vibration criteria.
Geophone: senses particle velocity across selected axes and is common for ground-transmitted vibration.
Accelerometer: measures acceleration and is useful for structural dynamic response or higher-frequency behaviour.
Movement & survey
Prism + total station: provides point displacement and, with an automated total station, repeatable remote observations where line of sight exists.
Precise levelling: supports high-quality relative level-change measurements.
GNSS: can suit open-sky, larger-scale movement where satellite visibility and required accuracy are appropriate.
Tilt, cracks & structure
Manual or MEMS tiltmeter: measures rotation at a local point and can be automated.
Tell-tale, crack gauge or crackmeter: provides visual or quantitative crack-width change.
Strain gauge, load cell or displacement transducer: suits specific structural or temporary-support questions after engineering review.
Ground response
Inclinometer: profiles subsurface lateral movement, often around retaining systems.
Settlement point: supports level-change monitoring.
Piezometer or standpipe: is relevant only when groundwater or pore-pressure response is part of the risk.
04 / Selection logic
Different Instruments for the Same Monitoring Parameter
Related instruments can all inform “movement”, “crack change” or “vibration”, but they observe different physical quantities and have different deployment constraints.
05 / Dynamic risk
Demolition Vibration Monitoring
Where vibration comes from
Concrete breaking, cutting, crushing, heavy machinery, falling debris and ground treatment can create different signatures. Trial activities can help characterise the response before full production works.
Monitoring may track PPV, frequency, acceleration and time-history, depending on the asset and the engineering question.
How to use the data
Establish baseline readings, relate events to the demolition sequence, define project-specific trigger levels and route alerts to responsible personnel. Thresholds should reflect local regulations, specifications, asset sensitivity and condition.
There is no universal global PPV limit. Alerting does not replace engineering review or site verification.
06 / Adjacent assets
Protecting Adjacent Buildings and Sensitive Property
Before demolition
Review asset condition, construction joints, shared walls, basements, utilities and access constraints. Complete a condition survey and establish baseline vibration, level, movement or crack readings where justified.
During demolition
Combine the methods that answer the risk: crack or tilt monitoring for retained structures, prisms for surface movement, levelling for settlement and vibration monitors for dynamic effects.
After critical activities
Compare trends with the baseline, investigate alerts, document inspections and complete final verification. Monitoring evidence supports decisions; it does not make legal or damage-liability determinations.
07 / Automation
Automated Monitoring and Alerts
Remote observations
Automated total stations, tilt sensors, electronic crackmeters and remote vibration monitors can produce time-series data without requiring a team member at every point.
Data flow
Dataloggers, dashboards and threshold-based notifications can help teams see trends and route alerts by SMS or email where the selected system supports it.
Human validation
Automation still needs sensor checks, reference stability review, maintenance, manual verification and engineering interpretation. A practical model is manual verification + automated monitoring + engineering review.
08 / Delivery
A Practical Demolition Monitoring Workflow
Risk and asset review
Map demolition methods, retained structures, neighbours, utilities and sensitive equipment.
Baseline survey
Record relevant condition, level, movement, tilt or vibration information before work.
Monitoring design
Define points, instruments, sampling, trigger levels, responsibilities and reporting.
Installation
Install, protect, survey and validate instruments and reference points.
Baseline readings
Confirm stable data and make sure the team understands the dashboard or report.
Active demolition
Relate readings to the sequence, equipment and critical activities.
Review and alert
Check trends, investigate triggers and coordinate engineering/site responses.
Close-out
Complete final verification, reporting and a clear record of monitoring observations.
09 / Published references
International Verified Demolition Monitoring Examples
These are published third-party examples, not GEOUE projects. Instrument details are stated only where the cited source identifies them.
United States • Seattle
Alaskan Way Viaduct Demolition
Infrastructure demolition and subsequent filling of the Battery Street Tunnel created a vibration risk for nearby infrastructure and adjacent structures.
Project context and monitoring relevance
Sixense reports that risk calculations and trial tests were used to assess heavy machinery and falling concrete pieces. The implemented plan used 17 vibration monitors and a long-term unattended monitoring system during demolition and tunnel filling.
Source: Sixense, Alaskan Way Viaduct Demolition project page. Industry case study; project and method details are attributed to Sixense.
United Kingdom • London
Bevis Marks Office Block Pile Reuse
Demolition effects on existing piles and surrounding soil were studied before a new development reused the foundations.
Project context and monitoring relevance
Cambridge CSIC describes distributed fibre optic sensing installed in existing piles and a borehole. The system produced continuous strain profiles during demolition and captured ground heave, helping assess pile performance and suitability for reuse.
Source: University of Cambridge CSIC, Monitoring reused piles with distributed fibre optic sensing.
Australia • Sydney
AMP Centre Partial Demolition and Reconstruction
A 48-storey office building underwent renovation involving demolition and reconstruction of its northern section.
Project context and monitoring relevance
Western Sydney University’s thesis record describes real-time structural health monitoring of the core wall and podium, with attention to structural response, differential settlement, potential damage during demolition and existing concrete defects.
Source: Western Sydney University, Structural health monitoring of the AMP building during its partial demolition and reconstruction, 2022 thesis record.
France • Narbonne
Orano Malvési Processing Centre Demolition
A concrete slab foundation was demolished within a uranium processing centre beside sensitive processing equipment.
Project context and monitoring relevance
Sigicom reports a real-time vibration plan for an adjoining sensitive building and tank structure. Two triaxial vibration monitors were placed at 2 m and 5 m from hydraulic rock-breaker activity; monitoring was used first to evaluate the structure’s response and then during active demolition.
Source: Sigicom, Vibration monitoring of a demolition project. Supplier-published case study; no GEOUE involvement is implied.
United States • Maryland
Harry Nice Bridge Existing-Bridge Demolition
Controlled blasting of an existing bridge took place beside a newly constructed bridge.
Project context and monitoring relevance
Foundation Test Group states that it conducted vibration monitoring of the new bridge during controlled blasting of the existing bridge to verify structural response against established project limits.
Source: Foundation Test Group, Harry Nice Bridge case study. Supplier-published case study; project claims are attributed to FTG.
United States • Chicago
Urban Demolition Beside a 90-Year-Old Residence
A higher-education institution demolished structures for a new mid-rise building next to an older residential property in a dense urban setting.
Project context and monitoring relevance
CTLGroup reports a preconstruction survey, ground-vibration monitoring with remotely readable units in neighbouring and institution-owned properties, and later structural monitoring of a shared unreinforced masonry wall. The project name was not disclosed in the source.
Source: CTLGroup, Remote Monitoring for Urban Demolition. Industry case study; project name not disclosed.
10 / GEOUE support
How GEOUE Supports Demolition Monitoring
Integrated monitoring design
Bring ground, structural, vibration and survey questions into one risk-led monitoring plan instead of selecting instruments in isolation.
Flexible instrument selection
Compare project geometry, adjacent assets, demolition method, frequency requirements, visibility and automation needs before recommending a combination.
Manual and automated options
Use campaign surveys, installed sensors, remote data collection or a hybrid approach according to risk, access and reporting requirements.
Data with engineering context
Baseline review, trend assessment, trigger evaluation and clear reporting are as important as sensor installation. Explore GEOUE’s automated monitoring and geotechnical instrumentation capabilities.
Related monitoring services
Depending on the site, relevant disciplines may include settlement monitoring, building monitoring and technical reporting supported by the GEOUE Technical Hub.
Project discussion
Share the demolition sequence, nearby assets and decision points so the monitoring scope can be developed around the actual project—not a generic equipment list.
11 / Conversion point
Planning a demolition project?
Discuss monitoring scope, adjacent assets, instrumentation selection, automated monitoring and reporting requirements with the GEOUE team.
12 / Common questions
Demolition Monitoring FAQ
What monitoring is typically required during demolition?
There is no universal package. The appropriate scope may include condition survey, vibration, settlement, displacement, tilt, crack, groundwater or retaining-wall monitoring, depending on the method, structure and neighbouring risks.
How is vibration monitored during demolition?
Vibration monitors or seismographs are placed at representative sensitive locations and configured for the project’s measurement objective. Data is reviewed against project-specific criteria, activity records and the asset’s condition; PPV and frequency may be relevant, while accelerometers can suit structural dynamic questions.
How can adjacent buildings be monitored during demolition?
Start with a baseline condition survey and select complementary methods such as prisms, levelling, tiltmeters, crack gauges and vibration monitors. Automated and manual observations can be combined with engineering review.
What is the difference between prism monitoring and tilt monitoring?
Prisms observed by a total station measure the displacement of a surveyed point, potentially in 3D. A tiltmeter measures local angular rotation. A structure can rotate without showing the same translation at every point, so the two methods answer different questions.
When is automated monitoring useful?
Automation is useful when the risk, access, monitoring frequency or response time makes repeated remote readings valuable. It still requires reference checks, maintenance, validation and engineering interpretation.
Are inclinometers required for demolition projects?
Not necessarily. They may be appropriate when the demolition interacts with retaining systems, excavation, ground movement or nearby underground works. They are not a default requirement for every building demolition.
When should demolition monitoring begin?
As early as the project risk assessment requires, with baseline surveys and readings before relevant demolition activities. The start point should be agreed with the project team around access, asset sensitivity and the monitoring design; there is no single fixed global time period.
13 / Technical references
Sources & Technical References
Government and institutional guidance
- Singapore LTA — Handbook on Development & Building Works in the Railway Protection Zone
- Singapore BCA — Building Control Act amendment regulations and instrumentation/monitoring plan requirements
- University of Cambridge CSIC — Monitoring reused piles with distributed fibre optic sensing
- Western Sydney University — AMP building structural health monitoring thesis record
Published project and industry case studies
External examples are presented as published third-party references. They do not represent GEOUE projects or GEOUE participation.
GEOUE / DEMOLITION
Discuss Your Demolition Monitoring Requirements
Tell us about the demolition sequence, adjacent structures, ground conditions and reporting needs. We can discuss a proportionate monitoring approach for your project.