Abstract
In order to investigate the freeze-thaw law of frame-anchored supported slopes in the seasonal freezing zone, based on the theory of the heat and matter passing, the mathematic model equations of temperature, moisture, and stress fields were established. The temperature and moisture fields were analyzed using the finite difference method, and the stress fields were analyzed using the finite unit method at each time step. For the synergistic effect of soil and support structure, a zero-width four-node unit is proposed as a link unit to reflect the linkage between the two. The calculation program was prepared using MATLAB software, and the accuracy practicability of the program is verified by the accordance of calculating and experimenting results. These results indicate the following: the top of the slope is more affected by temperature, and the maximum depth of surface temperature effect on the soil is 2.0m and 1.5m at freezing and thawing, respectively. The shear stress at freezing is about 2.5 times of that at thawing and is evenly distributed on the slope, when the slope is in a stable state; the shear stress at the foot of the slope appears stress concentration at the thawing, and sudden change of shear stress occurs at the intersection of the thawing and freezing zones, at which time the slope is in an unstable state; the inner force of anchor rod in freezing condition is the largest among the 3 working conditions, about 2.4~2.5 times of the initial condition; the anchor rod leaves residual stress in thawing, about 1.1~1.3 times of the initial condition. It shows that the frost deformation during the frozen-thaw process has a great influence on the internal force of the anchor rod. Once its tensile limit is exceeded, the anchor rod will be pulled out, resulting in protection failure and slope instability. Therefore, the effect of frost deformation on the internal force of anchor rod should not be ignored, and it is necessary to pay attention to the slope engineering in similar soil climate areas.
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Funding
The work described in this paper was fully supported by a grant from the QingHai Depaetment of Science and Technology Project “Study on the mechanism of meltwater precipitation causing disaster on alpine loess slopes and the synergistic slope protection by mixed planting (No. 2020-ZJ-718)” and Ministry of Education of the People’s Republic of China “Chunhui Program (No. QDCH2018002).”
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Tian, X., Yuan-xun, L., Shuai-hua, Y. et al. Coupling effect of heat-moisture-stress on the freeze-thaw characteristics of slope supported with framed anchor. Arab J Geosci 15, 33 (2022). https://doi.org/10.1007/s12517-021-09305-3
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DOI: https://doi.org/10.1007/s12517-021-09305-3