Overview
ISO/TS 14837-32:2015 - Mechanical vibration - Ground-borne noise and vibration arising from rail systems - Part 32: Measurement of dynamic properties of the ground - is a Technical Specification that provides guidance and standardized methods to measure and estimate the dynamic properties of the ground that control transmission of ground-borne vibration and noise from rail systems into nearby buildings and foundations. Published in December 2015, this part of the ISO 14837 series supports reliable prediction, design of railways and foundations, development of countermeasures, and validation of design methods.
Key Topics
- Fundamental wave propagation: definitions of p‑waves (dilatational), s‑waves (shear), surface and guided waves, wave speeds and impedances that influence transmission and distance attenuation.
- Dynamic ground parameters: shear modulus, bulk modulus, constrained modulus, mass density, material loss factor (damping), non-linearity, anisotropy and effects of groundwater and layering (stratification).
- Geometry and nearfield effects: influence of layer geometry, lateral variability and free surfaces on wave propagation.
- Measurement and estimation methods:
- Empirical correlations with geotechnical index parameters (SPT, CPT).
- Indirect in-situ determination from penetration tests (CPT, SPT).
- Direct in-situ seismic methods: surface-wave measurements, down‑hole/up‑hole (S‑CPT), cross‑hole, refraction/reflection techniques.
- Laboratory tests: piezo measurements, resonant column, cyclic triaxial, torsional shear and other dynamic tests.
- Strategy and application: guidance on selecting methods based on expected severity, available data, and whether direct propagation measurements or parameter-based models are appropriate.
- Symbols and abbreviations: standardized nomenclature to support consistent reporting and modelling.
Applications
ISO/TS 14837-32:2015 is used to:
- Predict ground-borne vibration and noise from rail operations for environmental assessments.
- Design railway track systems, foundations and mitigation (insulation, barriers, foundation isolation) to meet vibration/noise criteria.
- Validate and calibrate numerical models and transmission predictions.
- Support site investigation programs and data interpretation for projects near rail lines.
Who should use this standard
- Geotechnical and geophysical engineers
- Railway and track designers
- Vibration and acoustic consultants
- Structural and foundation engineers
- Regulators and environmental assessment professionals
Related Standards
- ISO 14837-1:2005 - Mechanical vibration - Ground-borne noise and vibration arising from rail systems - Part 1: General guidance (normative reference).
- ISO 14837 series (other parts under development), developed by ISO/TC 108/SC 2.
This specification is essential for practitioners needing standardized, practical methods for measuring dynamic ground parameters to assess and mitigate ground‑borne vibration and noise from rail systems.