29.E Vibration and Damage Control.
29.E.01 Blasting operations in or adjacent to cofferdams, piers, underwater structures, buildings, structures, or other facilities must be carefully planned with full consideration for all forces and conditions involved.
29.E.02 Prior to initiation of vibration controlled blasting operations, a written plan for monitoring the operations must be established.
29.E.03 When appropriate, owners, occupants, and the public must be notified of the nature of blasting operations to be undertaken and controls to be established.
29.E.04 Where vibration damage may occur, energy ratios and peak particle velocities must be limited in accordance with state requirements or the requirements in Table 29-1, whichever is more stringent. When any recording indicates either energy ratio or peak particle velocity limits have been exceeded, blasting must be suspended and the designated authority (Government and Contractor) must be immediately notified; blasting must not be resumed until the probable cause has been determined and corrective measures taken.
| The maximum total energy ratio (ER) shall be limited to 1.0, calculated as follows: ER = (3.29FA)2 Where:F = frequency in cycles per second A = amplitude in inches The total energy ratio is equal to the arithmetic sum of the energy ratios in the 3 mutually perpendicular planes of motion in the vertical and horizontal directions at any one instant of time. |
| The maximum total peak particle velocity (PV) shall be limited to 1.92, calculated as follows: PV = A/t Where:A = amplitude in inches t = time in seconds The total peak particle velocity is equal to the vector sum of the particle velocities in the 3 mutually perpendicular planes of motion in the vertical and horizontal directions at any one instant of time. |
29.E.05 Where required by State regulations, scaled distances must be determined before each shot and included in the records. Scaled distances must not exceed limitations set by the State.
29.E.06 Air blast pressure exerted on structures resulting from blasting must not exceed 133 dB (0.013 psi).
29.E.07 The monitoring, recording, and interpreting of vibrations must be by qualified personnel. Records and interpretations must be furnished to the GDA.
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29-7. What must owners, occupants, and the public be notified of prior to blasting?
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