Stress-Strain-Strength Characteristics of Frozen Sands with Various Fine Contents

Abstract

Recently, the participation on the development of the natural gas pipeline in Russia as well as the recent construction of the second Korean Antarctic research station, the Jangbogo station provide the research interests on the behavior of the permafrost ground. To investigate the effect of fines on the mechanical responses of frozen sands, unconfined compression tests were performed on the frozen sands with 0, 5, 10 and 15% of fine contents at -5, -10 and -15℃. The poorly graded (SP) Joomunjin sand and kaolinite, silt with low plasticity (ML) were used for the preparation of the frozen soil specimens. The mechanical responses of the tested soils were investigated via unconfined compression tests in the temperature controlled laboratory and analyzed in terms of peak unconfined compressive strength and secant modulus at 50% of the peak strength. As the fine contents increase, the unfrozen water contents increase and thus the strength and stiffness of frozen soils decrease. The increment of the stiffness and strength due to the temperature decrease vary with the fine contents.

Particle Spacing Analysis of Frozen Sand Specimens with Various Fine Contents by Micro X-ray Computed Tomography Scanning

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ABSTRACT :The mechanical characteristics of frozen sand greatly depend on the frozen temperature and the fine contents according to the previous study by Chae et al (2015). There are two hypotheses to explain this experimental results; one is the unfrozen water contents greatly affected by the fine contents and frozen temperature and the other is the sand particle spacing greatly affected by the pore-ice.

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The Effect of Fines and Temperature on the Mode I Fracture Characteristics of the Frozen Sand

“…ese research studies show that the fine contents, temperature, and unfrozen water contents are the major influencing factors affecting the mechanical behaviour of frozen soil. Chae et al [8] performed the unconfined compression tests using the frozen sand with different fine contents and temperature to investigate the mechanical response of the frozen sand. Based on the test results, as the fine contents and temperature increase, the strength and stiffness of frozen sand decrease.…”