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IS 14881:2001 is the Indian Standard (BIS) for method for blast vibration monitoring - guidelines. This standard provides guidelines for monitoring ground vibrations induced by blasting operations in mining, quarrying, and civil engineering projects. It details the required instrumentation, monitoring procedures, data analysis techniques, and establishes safe vibration limits (PPV) to prevent damage to various types of structures and address human response.
Method for Blast Vibration Monitoring - Guidelines
! The relationship between charge weight, distance, and vibration (Scaled Distance) is site-specific and must be determined through trial blasts for accurate prediction and control.
! Proper coupling of the geophone transducer to the ground or structure is critical for accurate measurements; poor coupling will result in erroneously low readings.
! Human annoyance is often a governing factor, as vibration levels that are safe for structures can still lead to complaints. Refer to both structural damage criteria (Table 1) and human response criteria (Table 2).
Field Practice Guidelines for Blasting Seismographs 2015International Society of Explosives Engineers (ISEE), USA
HighCurrent
Field Practice Guidelines for Blasting Seismographs
Provides detailed guidelines on the selection, deployment, and use of seismographs for blasting.
AS 2187.2-2006Standards Australia, Australia
HighCurrent
Explosives - Storage and use - Part 2: Use of explosives
Includes comprehensive sections on managing blast effects, including ground vibration and airblast monitoring procedures.
DIN 4150-3:2016-12Deutsches Institut für Normung, Germany
MediumCurrent
Structural vibration - Part 3: Effects of vibration on structures
Focuses on vibration effects and damage criteria, but includes required measurement protocols to assess them.
BS 7385-2:1993British Standards Institution (BSI), UK
MediumCurrent
Evaluation and measurement for vibration in buildings - Part 2: Guide to damage levels from ground-borne vibration
Provides guidance on damage levels and the necessary measurement techniques to evaluate ground-borne vibration.
Key Differences
≠IS 14881 is a 'guideline' and is generally less prescriptive in its requirements compared to the ISEE Guidelines, which define specific performance classes (e.g., Class 1) for seismographs used in compliance monitoring.
≠While IS 14881 suggests recording air overpressure, it is less specific on the microphone's frequency response characteristics. ISEE guidelines explicitly require a 2 Hz high-pass response system to accurately measure low-frequency airblast.
≠IS 14881 recommends calibration 'periodically as per manufacturer’s recommendations', while standards like AS 2187.2 and the ISEE Guidelines are more specific, typically recommending an annual calibration interval.
≠International standards like DIN 4150-3 and BS 7385 are tightly integrated with specific building damage criteria curves (PPV vs. frequency), whereas IS 14881 is a standalone document focused purely on the monitoring method, referencing other IS codes for damage criteria.
Key Similarities
≈All standards identify Peak Particle Velocity (PPV) as the primary parameter for assessing the potential for ground vibration to cause structural damage.
≈The use of triaxial geophone sensors to measure vibration in three mutually perpendicular axes (Vertical, Longitudinal/Radial, Transverse) is a fundamental and common requirement across all standards.
≈All guidelines stress the critical importance of ensuring proper coupling of the geophone to the ground (e.g., by burying, spiking, or using sandbags) to ensure accurate data collection.
≈A common requirement is the need for comprehensive documentation for each measurement, including blast details, instrument settings, sensor location, and site conditions.
Parameter Comparison
Parameter
IS Value
International
Source
Primary Ground Vibration Metric
Peak Particle Velocity (PPV) in mm/s.
Peak Particle Velocity (PPV) in mm/s or in/s.
ISEE Guidelines / AS 2187.2
Sensor Configuration
Triaxial geophone assembly.
Triaxial geophone assembly.
ISEE Guidelines / AS 2187.2
Recommended Instrument Frequency Range
Should be capable of responding from 2 Hz to 250 Hz.
Flat response (e.g., within +/- 5%) from 2 Hz to at least 250 Hz for compliance-grade instruments.
ISEE Guidelines
Air Overpressure Measurement
Measured in dB or on a linear scale (e.g., Pa, mbar).
Linear Peak Sound Pressure Level in decibels (dBL) with a 2 Hz high-pass microphone.
ISEE Guidelines
Calibration Interval
Periodically as per manufacturer's recommendations.
Annually recommended for compliance monitoring instruments.
ISEE Guidelines / AS 2187.2
Resultant Peak Vector Sum (PVS)
Mentions calculation but focuses on individual component PPVs.
Often calculated and reported, but component PPV remains primary for comparison with frequency-based criteria.
ISEE Guidelines
Sensor Placement Guidance
Coupled firmly by burying or using sandbags on a levelled surface.
Detailed guidance including burial depth (at least half the sensor height), use of spikes for soil, or bolting/epoxy for rock/concrete.
AS 2187.2
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Safe PPV for domestic houses (<10 Hz)5 mm/s
Safe PPV for domestic houses (>10 Hz)10 mm/s
Safe PPV for historical structures (<10 Hz)2 mm/s
Safe PPV for industrial RCC structures (>10 Hz)25 mm/s
Human perception threshold for vibration0.5 mm/s
PPV level for frequent human complaints2.5 mm/s
Key Formulas
PPV = K * (D / sqrt(W))^-B — Scaled distance formula for predicting Peak Particle Velocity (PPV), where D is distance, W is charge weight, and K & B are site constants (Clause 7.3).
Tables & Referenced Sections
Key Tables
Table 1 - Safe Limits of Peak Particle Velocity (ppv) at Foundation Level for Different Types of Structures
Table 2 - Human response to transient vibration in terms of peak particle velocity
Key Clauses
Clause 4 - Instrumentation
Clause 5 - Monitoring Procedure
Clause 7 - Evaluation of Vibration Effects
Annex A - Damage Criteria for Various Structures
Annex B - Human Response to Vibration
Frequently Asked Questions4
What is the safe vibration limit (PPV) for a typical residential building?+
For frequencies below 10 Hz, the limit is 5 mm/s. For frequencies above 10 Hz, the limit is 10 mm/s (Table 1).
At what vibration level do humans typically start to complain?+
Complaints are frequent for vibrations above 2.5 mm/s. The threshold for human perception can be as low as 0.5 mm/s (Table 2).
What instrument is used to measure blast vibrations?+
A blast vibration monitor (seismograph) equipped with tri-axial geophones is used to measure the peak particle velocity (PPV) in three orthogonal directions (Clause 4).
How is the location for monitoring chosen?+
Monitoring should be done on the ground level of the structure nearest to the blast, or on the foundation. The transducer should be firmly coupled to the surface (Clause 5.2).