Although a clear trend in reduction in ground vibration was not observed in the transverse direction, the RMS of ground acceleration has been reduced by 52 %, 53.5 % and 20 % for trench widths of 30 cm, 60 cm and 90 cm, respectively. 3.3 Effect of depth of trench filled with coal bottom ash Figs. 11 , 12 , and 13 compare the wave form at L1 (in front of the coal bottom ash in-filled trench) and L2 (behind the coal bottom ash in-filled trench) for trenches with depths of 50 cm, 75 cm and 100 cm, respectively.
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Use of in-filled trenches to screen ground vibration due to impact pile driving: experimental and numerical study.
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