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Prediction of Vibration from Compaction Passes (TRL)
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The following equation is proposed for the prediction of vibration from normal compaction passes:

`\nu_(res)=k_ssqrt(n)(A/(x+w))^(1.5)`

where:
- `k_s=75`, with a 50% probability of the vibration level being exceeded
- `k_s=143`, with a 33% probability of the vibration level being exceeded
- `k_s=276`, with a 5% probability of the vibration level being exceeded
- `n` is the number of drums
- `A` is the nominal amplitude of the vibrating roller (mm)
- `x` is the distance along the ground surface from the roller (m) and
- `w` is the width of the vibrating drum (m)

During the start up and run down of vibratory rollers, the attenuation rate was found to be lower than that during steady state vibration. The following relation was determined:

`\nu_(res)=k_tsqrt(n)(A^(1.5))/((x+w)^(1.3))`

where:
- `k_t=65`, with a 50% probability of the vibration level being exceeded
- `k_t=106`, with a 33% probability of the vibration level being exceeded
- `k_t=177`, with a 5% probability of the vibration level being exceeded

Source: Transport Research Laboratory Report 429 *Groundborne vibration caused by mechanised construction works* (2000), Equations 11 & 12

Comments or suggestions to
strutt@arup.com