Overview - ISO 10815:2016 (Mechanical vibration, tunnel vibration measurement)
ISO 10815:2016 defines the basic principles for measuring, processing and evaluating vibration generated internally in railway tunnels by passing trains. The standard establishes repeatable procedures so that tunnel structural responses can be compared:
- over time for the same tunnel and excitation source, and
- between different tunnels when excitation is comparable.
It applies to measurements of the tunnel structure and secondary elements mounted in the tunnel, not to human perception (people in or near tunnels, or train passengers).
Key topics and technical requirements
- Scope and purpose: Standardizes tunnel vibration measurement procedures to obtain comparable data for structural response monitoring and verification.
- Factors affecting vibration: Tunnel geometry, lining and secondary elements, depth, soil properties (stiffness, compaction, water level) and source-related factors (train, track, wheel-rail contact, speed, loading).
- Frequency ranges: Frequencies of interest typically cover about 1 Hz to 100 Hz for tunnel elements; rail-side excitation can include up to ~2 kHz and beyond.
- Quantities to measure: Kinematic values - velocity is preferred at low frequencies; acceleration at higher frequencies.
- Transducer positioning: Prefer a straight tunnel stretch (ideally ≥200 m). Typical measurement points per cross-section:
- Invert (vertical centre line) between sleepers or fasteners,
- Vault directly above the invert point,
- Tunnel wall close to the track (~1.20 m above rail level),
- Foot of rail for source–structure correlation (mounted perpendicular to rail plane).
- Mounting and instrumentation: Follow ISO 5348 for accelerometer mounting; mountings must be rigid, light and have resonance well above the measurement band. Protect accelerometers from airborne sound. Measure background noise (signal-to-noise ratio) where possible.
- Test types: Full tests (multiple sections and axes) and limited tests (reduced set of points) with rules for repeatability and discarding inconsistent readings.
- Reporting and evaluation: Guidance on processing, evaluation and test report contents to enable comparative assessment.
Practical applications and users
ISO 10815:2016 is used for:
- Post-construction verification against design predictions,
- Regular monitoring when maximum allowable vibration levels are defined,
- Integrity checks after abnormal events (e.g., blasting, earthquakes),
- Assessing effects of track or vehicle modifications.
Typical users:
- Railway infrastructure owners and asset managers,
- Tunnel and structural engineers,
- Vibration and acoustic consultants,
- Maintenance teams and testing laboratories,
- Regulatory bodies and researchers.
Related standards
- ISO 5348 - Mechanical mounting of accelerometers (normative reference)
- ISO 1683 - Preferred reference values for acoustical and vibratory levels (normative reference)
- ISO 4866 - Mechanical vibration (referenced for signal classification)
Keywords: ISO 10815:2016, tunnel vibration measurement, railway tunnels, mechanical vibration, transducer placement, accelerometer mounting, signal-to-noise ratio, 1–100 Hz.