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Shear behaviour of anchor solid-soil interface under confining pressure and freeze–thaw cycles

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Abstract

To study the influence of the stress state on the interface shear behaviour between the anchor solid and the soil, a triaxial test apparatus for the anchor solid-soil interface was developed, which can achieve the pull-out test of the anchor solid under different stress states. Based on the pull-out test of the anchor soil-soil interface, the effects of the water content, confining pressure, and F-T cycles on the shear-displacement behaviour and shear strength were analysed. Additionally, SEM images of different F-T times were taken, and the microstructure of the interface was analysed. The research results show that when the water content and confining pressure are relatively low, the curve is of the peak softening type. As the confining pressure and water content gradually increase, the curve gradually changes to strain hardening. When the water content gradually increases, the cohesion and internal friction angles both show downwards trends. With an increase in the number of F-T cycles, the shear strength and cohesion gradually decrease. The interface shear strength in the first three F-T cycles attenuates significantly and then gradually stabilizes, and the friction angle fluctuates with the number of F-T cycles. The lower the water content is, the greater the decrease in cohesion. With increasing F-T cycles, the soil particle shape, contact form, pore distribution, and size all changed. After 11 F-T cycles, the surface porosity increased from 17.7 to 21.2%, and the average pore size changed from 5.9 to 8.4 μm.

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Funding

The research described in this paper was financially supported by the Natural Science Foundation of China (NO. 51878242), the Natural Science Foundation of Hebei Province of China (NO. E2020404007), and the Special Project for Science and Technology Development of Qinghai Province of China (NO.2021-QY-217).

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Authors and Affiliations

  1. College of Civil Engineering, Hebei University of Architecture, Zhangjiakou, 075000, Hebei, People’s Republic of China

    Jie Dong, Chun-chen Tao & Xin Yan

  2. Hebei Key Laboratory for Diagnosis, Reconstruction and Anti-Disaster of Civil Engineering, Hebei University of Architecture, Zhangjiakou, 075000, Hebei, People’s Republic of China

    Jie Dong, Chun-chen Tao & Xin Yan

  3. School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710000, Shaanxi, People’s Republic of China

    Shuai Zhong

  4. School of Civil Engineering, Chongqing University, Chongqing, 400000, People’s Republic of China

    Zhi-hui Wu

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  1. Jie Dong
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  2. Chun-chen Tao
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  3. Shuai Zhong
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  4. Zhi-hui Wu
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  5. Xin Yan
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Correspondence to Jie Dong.

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The authors declare that they have no competing interests.

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Responsible Editor: Zeynal Abiddin Erguler

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Dong, J., Tao, Cc., Zhong, S. et al. Shear behaviour of anchor solid-soil interface under confining pressure and freeze–thaw cycles. Arab J Geosci 15, 879 (2022). https://doi.org/10.1007/s12517-022-10172-9

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  • DOI: https://doi.org/10.1007/s12517-022-10172-9

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