Nicol E. Flandes, Felipe A. Villalobos, Robert King
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The effect of weathering on the variation of geotechnical properties of a granitic rock from Chile
The effect of rock weathering on geotechnical parameters can become substantial in geotechnical design. The weathering degree WD has been normally divided in five levels from fresh rock to completely weathered rock. In this study, the above five WDs are adopted to analyse the variation of several regularly used geotechnical properties. To that aim, a series of laboratory tests to a Chilean granitic rock in different stages of weathering was carried out. The results of the tests have been analysed by normalising each geotechnical parameter respect to the value obtained for slightly weathered samples instead of the fresh rock samples, which is usually adopted. In this way, it was found that the results of unconfined compressive strength UCS reduces steadily and considerably with each WD, which has been previously reported. Conversely, the modulus of deformation and P-wave velocity tend to stabilise the rate of reduction for highly and completely weathered rock samples, which does not agree with the trend and higher rate reductions found by other authors. This stabilisation reduction rate with WD was also found for compaction density, friction angle and Poisson's ratio.
期刊介绍:
Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House.
Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards.
The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.