Geotechnical Verification Of Impact Compaction
Author(s)
P. J. Waddell, R. A. Moyle & R. J. Whiteley
Abstract
Remediation of brownfield sites is often dominated by environmental treatment
of the fill. However, conventional methods for geotechnical verification of
ground improvement techniques are invasive, slow, costly and of limited
accuracy. Seeking improvements to this process, we applied both innovative
geophysical testing and conventional testing methods to assess ground
improvement in a full scale impact compaction trial. Ground improvement using
an impact roller was proposed to form a compacted soil raft suitable to support
commercial development, thus avoiding excavation and compaction of the full
fill thickness.
A range of geotechnical testing and monitoring techniques were utilised to
assess the effect of the impact compaction, including: Multi-channel Analysis of
Surface Waves (MASW), Electric Friction Cone Penetrometer Tests (CPT), In
situ Density Tests, Dynamic Cone Penetration Tests, and Topographic survey.
The results of extensive geotechnical and geophysical testing showed
reasonable correlation between the CPT, density and S-wave velocity results.
These tests showed a similar depth of influence as a result of impact compaction,
which generally increased with increasing number of passes.
The MASW testing provided shear wave velocity profiles showing the
consistency achieved in the landform. A statistical approach was used to
develop a relationship between the MASW testing and DDR. This allowed a
target shear wave velocity to be identified and the MASW to be used as a rapid
means to assess both density and variability within the fill before and after
ground treatment.
Keywords: density, compaction control, MASW, impact rolling.
Keywords
density, compaction control, MASW, impact rolling
Related Book
Other papers in this volume
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