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Effect of the frozen layer on the stability of cut soil slopes during seasonal freezing and thawing

Research in Cold and Arid Regions 2022年第5期14卷 281-292页

作者： Ting Wang HaiLiang Jia Qiang Sun GuoYu Li College of Geology and Environment Xi'an University of Science and TechnologyXi'anChina College of Architecture and Civil Engineering Xi'an University of Science and TechnologyXi'anChina State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesCASLanzhouChina

Research on the stability of soil slopes in seasonally frozen regions has mainly focused on slope failures during the thawing *** are few studies on slope stability during the freezing window and its subsequent influence on slope failure in the next thawing *** this paper,soil strength was tested during freezing and thawing to obtain temperature-dependent strength parameters for the simulation of slope ***,the slope's temperature field over an entire year was accurately simulated so that characteristics of the frozen layer could be determined at any *** on the above results,the progressive failure modes of frozen soil slopes are *** results show that:1)during the freezing window,depth of the frozen soil layer increases,as does the slope's safety factor,while a yield zone propagates towards the slope shoulder.(2)During the thawing window,the frozen soil layer shrinks in depth while the yield zone continuously expands,which decreases the safety *** analysis of these results indicate that the frozen layer provides a“toe-locking effect”that increases the safety factor during the freezing window,while it also provides a“dragging effect”that propagates the yield zone towards the slope *** the thawing window,the“toe-locking effect”gradually diminishes;a continuous sliding surface is formed,which lead to a *** frozen soil layer of the freezing window accelerates the slope sliding in the thawing window.

关键词： seasonally frozen layer Soil cut slopes Slope stability Stress field seasonal freezing and thawing

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