Inherent Complexities in Weathered Rocks : A Case of Volcanic Rocks

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Journal / PublicationRock Mechanics and Rock Engineering
Online published17 Jul 2021
Publication statusOnline published - 17 Jul 2021


This work presents the complex nature of weathered geomaterials by investigating the influences of geological features (textural, mineralogical, in situ specific volume, strength, structure) of parent rocks on weathering of decomposed volcanic rocks in the reconstituted and intact states. This was done by vertically comparing samples of the same weathering degrees but belonging to different formations and horizontally by comparing samples of different weathering degrees that belong to different formations. This is very important due to complex nature of geology and weathering processes of volcanic rocks. This was achieved through comprehensive physical and index tests, microstructure and mineralogical analyses, oedometer and triaxial tests as well as analyses of previous studies. Geological characters of parent rocks have been found to affect grading and index properties, mineralogy, compressibility, in-situ behaviour and strength. However, fabrics of decomposed volcanics are not parent geological features dependent and parent geological characters do not influence the effects of structure using both stress sensitivity and normalisation for volume. Based on these, geological and geotechnical properties of samples from different formations could be characterised separately to obtain parameters needed for engineering design and constructions. However, two geological units can be combined into the same geotechnical unit because physical, textural and mineralogical features lead to similar mechanical behaviour.

Research Area(s)

  • Geological formation, Geotechnical unit, Mechanical behaviour, Volcanic rock, Weathering

Bibliographic Note

Full text of this publication does not contain sufficient affiliation information. The Research Unit(s) information for this record is based on the then academic department affiliation of the author(s).