Vol. 2, Issue 9, Part F (2016)
Ground improvement techniques to mitigate the impact of seismic action on underground structures
Akinola Johnson Olarewaju
This study examines the various available ground improvement techniques to mitigate the effects of seismic actions like accidental explosions on underground structures (e.g. pipes). In this study, lateritic soil was taken at Abalabi, Ilaro, Ogun State, Nigeria and the solid plastic wastes were taken from different locations in Ilaro. The plastics wastes were grounded into pellets and substituted with laterite at 1% to 10%, 15%, 20%, 25% and 30% for compaction test with 0% serving as control experiment. Tests were conducted in line with BS 1377 (1990) to determine the moisture content, specific gravity and compaction. Another lateritic soil was taken from a borrow pit at Ona-Egbo, Ilaro, Ogun State, Nigeria and fly ash material was obtained from Ewekoro cement factory (Lafarge Group Nigeria Ltd) Papa-Itori road, Ewekoro, Ogun State. Cement used is elephant Portland cement. Fly ash at 2%, 4%, 6%, 8%, and 10% were used to replace lateritic soil at percentage water ratio ranging from 2% to 14%. Tests conducted in line with BS 1377 (1990) are the moisture content determination as well as compaction. The results were compared with the simulated results of Olarewaju (2013) in the study of the response of underground structures due to blast loads. From the results, the lowest dry density value is 0.96kg/m3 at 30% plastic pellets mixed with lateritic soil while the lowest bulk density value is 1.130 kg/m3 at 30% plastic pellets mixed with lateritic soil. It is evidently clear that at 30% plastic substitution and above, the density is relatively low and this would reduce the impact of accidental explosions on underground structures.
How to cite this article:
Akinola Johnson Olarewaju. Ground improvement techniques to mitigate the impact of seismic action on underground structures. Int J Appl Res 2016;2(9):383-387.