Study on the strength of frozen powdery clay and its influencing factors


	in the Mohe region

Abstract

Abstract:

Permafrost is significantly affected by temperature and freeze-thaw cycles. In order to explore its mechanical properties, this paper takes frozen soil in Mohe area as the research object, and conducts direct shear tests of frozen soil

under different moisture content and freeze-thaw cycle times, as well as dynamic triaxial tests of frozen soil under

different temperature, moisture content, confining pressure, loading frequency, and freeze-thaw cycle times, to analyze the shear resistance characteristics and dynamic performance of frozen soil under different influencing factors. The experimental results indicate that the shear stress and shear displacement curves of frozen soil samples are

strain softening type. As the moisture content and freeze-thaw cycles increase, the shear strength, cohesion, and internal friction angle of frozen soil samples all decrease to varying degrees. The dynamic elastic modulus of frozen

soil samples varies within the range of 210-800 MPa in the experiment, which is positively correlated with moisture

content, freeze-thaw cycle times, and loading frequency, and negatively correlated with temperature and confining

pressure conditions, with the most significant change with moisture content. Meanwhile, based on the experimental

results, the formula for calculating the dynamic elastic modulus of frozen soil based on various influencing factors

are derived. The above research results can provide reference data on the mechanical properties of frozen soil for

airport construction and other engineering projects in the Mohe area.

Key words:

permafrost, shear strength, dynamic elastic modulus, freeze-thaw cycles, moisture content

CLC Number:

QI Chunxiang, MA Jiahui, LU Weilong, ZHANG Kaiqiang, ZHAO Zhongtao.

Study on the strength of frozen powdery clay and its influencing factors

in the Mohe region

[J]. Journal of Civil Aviation University of China, 2025, 43(2): 45-51.

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Study on the strength of frozen powdery clay and its influencing factors

in the Mohe region

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