Econ. Environ. Geol. 2009; 42(3): 261-272

Published online June 30, 2009

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Variation of Engineering Geological Characteristics of Jurassic Granite in Wonju Due to Freeze-Thaw Weathering

Jeong-Gi Um1, Ik Woo2 and Hyuck Jin Park3*

1Dept. of Energy Resources Engineering, Pukyong National University
2Dept. of Coastal Construction Engineering, Kunsan National University
3Dept. of Geoinformation Engineering, Sejong University

Correspondence to :

Hyuck Jin Park

hjpark@sejong.ac.kr

Received: May 25, 2009; Accepted: June 24, 2009

Abstract

An experimental study of the accelerated weathering was performed to investigate the variations of physicomechanical properties of deteriorated rocks due to freeze-thaw weathering for the Jurassic granite specimens from Wonju, Gangwon-do. Each complete cycle of freeze and thaw was lasted 24 hours, comprising 2 hours saturating in vacuum chamber, 8 hours freezing at -20±1oC and 14 hours thawing at room temperature. Freeze-thaw cycles were implemented with measuring the index physical properties as well as geometries of microfractures. The seismic velocity was found to decrease with increasing freeze-thaw cycles. On the other hand, absorption tends to increase with freeze-thaw cycles. In the end, it was concluded that variations of the index properties of deteriorated specimen depend on its initial properties and flaws in rock. The size and density of the traces of the microfracture on slab specimen were changed continuously with increasing freeze-thaw weathering. The results obtained in this study show that the box fractal dimension(DB) has the strong capability of quantifying the combined effect of size and density of the microfractures.

Keywords weathered rocks, freeze-thaw, granite, microfracture, fractal dimension

Article

Econ. Environ. Geol. 2009; 42(3): 261-272

Published online June 30, 2009

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Variation of Engineering Geological Characteristics of Jurassic Granite in Wonju Due to Freeze-Thaw Weathering

Jeong-Gi Um1, Ik Woo2 and Hyuck Jin Park3*

1Dept. of Energy Resources Engineering, Pukyong National University
2Dept. of Coastal Construction Engineering, Kunsan National University
3Dept. of Geoinformation Engineering, Sejong University

Correspondence to:

Hyuck Jin Park

hjpark@sejong.ac.kr

Received: May 25, 2009; Accepted: June 24, 2009

Abstract

An experimental study of the accelerated weathering was performed to investigate the variations of physicomechanical properties of deteriorated rocks due to freeze-thaw weathering for the Jurassic granite specimens from Wonju, Gangwon-do. Each complete cycle of freeze and thaw was lasted 24 hours, comprising 2 hours saturating in vacuum chamber, 8 hours freezing at -20±1oC and 14 hours thawing at room temperature. Freeze-thaw cycles were implemented with measuring the index physical properties as well as geometries of microfractures. The seismic velocity was found to decrease with increasing freeze-thaw cycles. On the other hand, absorption tends to increase with freeze-thaw cycles. In the end, it was concluded that variations of the index properties of deteriorated specimen depend on its initial properties and flaws in rock. The size and density of the traces of the microfracture on slab specimen were changed continuously with increasing freeze-thaw weathering. The results obtained in this study show that the box fractal dimension(DB) has the strong capability of quantifying the combined effect of size and density of the microfractures.

Keywords weathered rocks, freeze-thaw, granite, microfracture, fractal dimension

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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