Abstract
This paper presents an experimental investigation on the effect of freeze–thaw cycling on expansive soil slopes with different initial moisture contents. Clay soil from Weifang, China, was remolded and selected to build the expansive soil slope for the indoor slope model tests. A total of five freeze–thaw cycles were applied to the three expansive soil slopes with different moisture contents ranging from 20 to 40%. Variations of the crack developments, displacements, soil pressures and moisture contents of the expansive soil slope with different initial moisture contents during the freeze–thaw cycling were reported and discussed. The results indicate that higher moisture contents can slow the development of cracks and that the soil pressure increases with decreasing temperature. The soil pressure of slope decreases after freeze–thaw cycle, and the change amplitude of soil pressure after freeze–thaw is proportional to water content. The slopes with a moisture content of 20% and 30% shrinks during freezing and expands during thawing, which was named ES-FSTE Model, while the slope with a 40% moisture content shows the opposite behavior. During freeze–thaw cycles, moisture migrates to slope surface. As initial moisture contents increase, the soil heat transfer rate and bearing capacity decreases after five freeze–thaw cycling.
Highlights
This paper presents an experimental investigation on the effect of freeze–thaw cycling on expansive soil slopes with different initial moisture contents
A smaller T-shaped crack appeared on the top of the S20 slope after the first freeze–thaw cycle
At the end of the fifth freeze–thaw cycle, the crack width continued to increase till 5 mm
Summary
This paper presents an experimental investigation on the effect of freeze–thaw cycling on expansive soil slopes with different initial moisture contents. Variations of the crack developments, displacements, soil pressures and moisture contents of the expansive soil slope with different initial moisture contents during the freeze–thaw cycling were reported and discussed. Freeze–thaw occurs due to the phase change of moisture in the soil subject to external temperature variations This process deforms the structure of the soil, and alters the mechanical properties of soil, which has induced a variety of disasters in engineering a pplications[7,8,9,10]. Research on the stability of slope models under freeze–thaw cycling requires high-performance test equipment, and there are few studies on the stability of expansive soil slopes considering different moisture contents. An experimental investigation on the expansive soil slope stability under different moisture contents would represent an important advance in the frozen soil engineering field. The failure mode revealed in the laboratory experiment can be very helpful to direct engineering design in the real world
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