Abstract
Large-scale shaking table model tests were carried out to study the dynamic behaviors of slopes and failure mechanism of landslide in permafrost regions. The model slope was constituted of silty clay layer stacked on an ice layer with 8° surface slope. Acceleration, displacement, and pore pressure were measured subjected to vertical and horizontal seismic loadings. The horizontal wave has a stronger influence on the failure of the model than the vertical wave motion, and the natural frequency of vibration in the horizontal direction decreased obviously at the failure state. The model slope has three components of different nonlinear mechanical properties, which are the soil layer, soil-ice interface, and ice layer. The amplification factor of peak ground acceleration is obviously smaller at the soil-ice interface than that at the soil and ice layer. The acceleration responses are nonlinear because of the nonlinear soil properties and degradation of modulus with increasing horizontal acceleration. Especially, excess pore pressure generation was observed near the soil-ice interface of the slope subjected to higher input acceleration, which resulted in the decrease of the effective stress. Failure surface appeared to be the soil-ice interface, which was consistent with the field observations of landslides in permafrost regions. Slope failure could be defined based on the massive movement of the slope, characterized by integral sliding pattern along the soil-ice interface without the distinct deformation inside the sliding body. The results show that the sliding of the slope with soil layer at gentle gradient is mainly triggered by the combined action of horizontal seismic wave, existence of soil-ice interface, and pore pressure generation in permafrost regions.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 41572255), the Western Project Program of the Chinese Academy of Sciences (KZCX2-XB3-19), the State Key Development Program of Basic Research of China (973 Plan, 2012CB026101 and 2011CB013505), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 41121061), and the Open Fund of State Key Laboratory of Frozen Soil Engineering (No. SKLFSE201209).
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Sun, H., Niu, F., Zhang, K. et al. Seismic behaviors of soil slope in permafrost regions using a large-scale shaking table. Landslides 14, 1513–1520 (2017). https://doi.org/10.1007/s10346-017-0823-x
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DOI: https://doi.org/10.1007/s10346-017-0823-x