ABSTRACT

It is very difficult to predict weathering characteristics of rock because of limitation caused by time and space. An experimental study of accelerated weathering was performed on Cretaceous granitic rock samples from Jinhae and Gimhae area in southeastern Korea to investigate physico-mechanical property changes including revelation characteristics of microfractures due to laboratory accelerated weathering process. Total of 140 cycles of freeze-thaw were completed on deteriorated rock specimens with measuring the index properties as well as geometries of microfractures. Each complete cycle of freeze and thaw implemented 24 hours, comprising 2 hours of saturating in vacuum chamber, 8 hours of freezing at 16±1°C and 14 hours of thawing at room temperature. The seismic velocity was found to decrease with increasing freeze-thaw cycle. Effective porosity and absorption tend to increase with freeze-thaw cycle. The amount of deterioration of rock samples depend on pre-test degree of weathering. Effective porosity, absorption and seismic velocity can be used as the measure of physical weathering for granitic rocks of the study area. The size and plane density of the microfracture on rock specimens were obviously changed with increasing freeze-thaw weathering. The conducted research in this study has shown that accelerated weathering test has strong capability to capture the weathering characteristics of deteriorated rocks.

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