藏东南地区冰碛土强度特性对温度响应试验研究

刘振兴; 王姣; 崔鹏; 江耀; 王睿; 刘子明

doi:10.3799/dqkx.2023.015

Volume 50 Issue 1

Jan. 2025

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Liu Zhenxing, Wang Jiao, Cui Peng, Jiang Yao, Wang Rui, Liu Ziming, 2025. Experimental Study on Response of Strength Characteristics of Glacier Tills to Temperature in Southeast Tibet. Earth Science, 50(1): 322-335. doi: 10.3799/dqkx.2023.015

Citation:

Liu Zhenxing, Wang Jiao, Cui Peng, Jiang Yao, Wang Rui, Liu Ziming, 2025. Experimental Study on Response of Strength Characteristics of Glacier Tills to Temperature in Southeast Tibet. Earth Science, 50(1): 322-335. doi: 10.3799/dqkx.2023.015

Citation:

Liu Zhenxing, Wang Jiao, Cui Peng, Jiang Yao, Wang Rui, Liu Ziming, 2025. Experimental Study on Response of Strength Characteristics of Glacier Tills to Temperature in Southeast Tibet. Earth Science, 50(1): 322-335. doi: 10.3799/dqkx.2023.015

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Experimental Study on Response of Strength Characteristics of Glacier Tills to Temperature in Southeast Tibet

doi: 10.3799/dqkx.2023.015

Liu Zhenxing^{1, 4
,
,},
Wang Jiao^{2, 3
,
,
,},
Cui Peng^{1, 3, 4},
Jiang Yao^{2, 3},
Wang Rui⁵,
Liu Ziming²

1.
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2.
Key Laboratory of Mountain Hazards and Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu 610041, China
3.
China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC (Chinese Academy of Sciences-Higher Education Commission of Pakistan), Islamabad 45320, Pakistan
4.
University of Chinese Academy of Sciences, Beijing 100049, China
5.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-10-24
Available Online: 2025-02-10
Publish Date: 2025-01-25

Abstract

Abstract

The mechanism of soil strength deterioration caused by the melting of buried ice in glacier tills formed since the Little Ice Age under the climate warming and humidification is of great significance for deeply comprehending the initiation process of glacier debris flow. Taking the soil from the source of Tianmo gully debris flow in Parlung Tsangpo Basin as the research object, the high-precision temperature control triaxial coupling experimental system was used to study the shear deformation characteristics of glacier tills under different temperature conditions, analyze the influence mechanism of temperature on deformation and failure, and construct the strength failure criterion of this multiphase medium. The results show that the deformation and failure of glacier tills were significantly affected by temperature. At -20 ℃, the glacier tills showed strain softening and shear band failure characteristics, and the glacier tills gradually exhibited strain hardening and bulging failure characteristics with the increasing temperature. The modulus, peak shear strength, internal friction angle and cohesion decreased with the increase of temperature, and the rate was fastest at -3 to -5 ℃, while the brittleness index increased with temperature increasing. Boltzmann function was introduced to describe the relationship between shear strength parameters and temperature. Analyses show that the critical temperature of shear strength parameter variation was around -4 ℃. The strength failure criterion of glacier tills containing temperature parameters was constructed based on Mohr-Coulomb theory. Compared with frozen soil containing pore ice, the strength of glacier tills which contain buried ice is mainly provided by the contact between particles, which is easier to be affected by the change of external temperature, and the response of strength to temperature is more complex.
- glacier till,
- strength degradation,
- temperature effect,
- temperature control triaxial test,
- engineering geology

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Experimental Study on Response of Strength Characteristics of Glacier Tills to Temperature in Southeast Tibet

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