Author(s): Uwanabasi Edet Umana, Oboho O. Eminue, Colin T. Davie
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 5 - Issue. 11 , November - 2016
Climate change is predicted to result in warmer and drier summer as well as wetter winter which we are already experiencing. This could result in instability of earth structures hence this study. Durham boulder clay was used to investigate the crack patterns, crack geometric parameters, shear strength and infiltration time of 400 mm x 400 mm x 75 mm samples sieved through 20 mm sieve and compacted to 1.35 g/cm3, 1.65 g/cm3 and 1.70 g/cm3 densities. Six cycles each were carried out and the samples were air-dried. The photographic images of the sample surface were used for crack analysis. Stability of crack pattern for each cycle was attained after 24 hours of drying. The final shear strengths of all the samples were higher than the control implying increased strength. The final crack depth of the VLC sample was 3.48 times that of the WC sample. The final crack width for the VLC sample was 2.12 times that of the WC sample. The CIF of all the samples reached stability by the 5th cycle. There was also stabilization in the infiltration of the samples by the third cycle and as such valid predictions could be made from this cycle. In practical scenarios, earth structures undergo more than 6 cyclic wetting and drying hence it can be inferred that they will attain stability by the fifth cycle. From this study, it can be noted that loosely compacted structures are more susceptible to failure than well-compacted structures.
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