Abstract
Rainfall and earthquakes are two of the major factors that provoke landslides. To investigate the seismic response and dynamic failure mode of the slope with tilted highly weathered layer subjected to earthquake and rainfall, two slope models with different moisture content were constructed and tested by using a large 1-g shaking table. It was observed that the acceleration amplification coefficient (AAC) in bedrock increases with increasing earthquake amplitude when the El Centro and Wenchuan acceleration amplitude are not larger than 0.33 g in two models, and the AAC in highly weathered layer decreases with increasing elevation and with increasing earthquake amplitude. The water content of the highly weathered layer can affect the dynamic response of the model. The acceleration response of model with general moisture content is weaker than that with saturated moisture content, which is the same as the displacement of slope surface. The marginal spectrum identification of dynamic damage process shows that the seismic damage occurs in the intercalated layer of the middle part slope firstly, and then it occurs in the intercalated layer of the lower part slope and in the covering layer, and finally, it occurs in the intercalated layer of upper part slope. Based on the marginal spectrum identification of dynamic damage process, the strain response, the displacement response, and the phenomenon of dynamic damage, the failure mode of the slope with tilted highly weathered layer can be concluded as the cracking–shearing–slippage and cracking–shearing–crushing.
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Acknowledgments
The authors are grateful to the unnamed reviewers for their valuable comments on the early version of the manuscript.
Funding
The authors gratefully acknowledge the financial support provided by the National Key Research and Development Plan of China (Grant No. 2017YFC0504901), the National Natural Science Foundation of China (Grant No. 51708163), the State Scholarship Fund of Studying Abroad (Grant No. 201707000161), and Doctoral Innovation Fund Program of Southwest Jiaotong University (Grant No. D-CX201703).
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Cao, L., Zhang, J., Wang, Z. et al. Dynamic response and dynamic failure mode of the slope subjected to earthquake and rainfall. Landslides 16, 1467–1482 (2019). https://doi.org/10.1007/s10346-019-01179-7
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DOI: https://doi.org/10.1007/s10346-019-01179-7