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).

IS 14881

: 2001

Method for Blast Vibration Monitoring - Guidelines

CurrentSpecializedGuidelinesGeotechnical · Rock Mechanics

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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

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).

Practical Notes

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).