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Study of Shaking Table Test on Dynamic Response Characteristics and Failure Mechanism of the Loess Slope
PU Xiaowu1,2,3, WANG Lanmin1,2,3, WANG Ping1, CHAI Shaofeng1, XU Shiyang1
1.Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China;2.Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Ministry of Education, Lanzhou 730000, China;3.College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
摘要:
The natural loess that covers the ground surface has good stability due to its low water content. However, when violent earthquakes occur, the strong dynamic stress generated in the slope may induce landslide disasters with different sizes. In this paper, a large-scale shaking table model test is used to reveal the dynamic response and instability failure process of the loess slope. The test results show that different parts of the slope have different vibration characteristics and the first natural frequency in the model increases with the increase of the slope height. The response acceleration of different parts may change due to the coupling relationship between the spectral characteristics of input wave and the natural frequencies of different parts of slope, suggesting the characteristics of regional differential dynamic response. Under the condition of different dynamic response, stress state and boundary conditions of different parts of slope, a rapid microstructural damage, cumulative residual deformation evolution, and tension-shear coupling instability failure process may appear at the top of the slope with the strong dynamic response associated with the increase of dynamic loading intensity. The Sd values presented in this paper may reflect soil damage and slope instability and failure.
关键词:  Loess slope  Shaking table  Dynamic response  Microstructure damage  Failure
DOI:10.19743/j.cnki.0891-4176.202001003
分类号:
基金项目:This project was sponsored by the Basic Scientific Research Fund, Science and Technology Innovation Base of Lanzhou, Institute of Earthquake Forecasting, China Earthquake Administration (2018IESLZ07) and the Key R&D Projects in Gansu Province(18YF1FA101).
Study of Shaking Table Test on Dynamic Response Characteristics and Failure Mechanism of the Loess Slope
PU Xiaowu1,2,3, WANG Lanmin1,2,3, WANG Ping1, CHAI Shaofeng1, XU Shiyang1
1.Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China;2.Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Ministry of Education, Lanzhou 730000, China;3.College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
Abstract:
The natural loess that covers the ground surface has good stability due to its low water content. However, when violent earthquakes occur, the strong dynamic stress generated in the slope may induce landslide disasters with different sizes. In this paper, a large-scale shaking table model test is used to reveal the dynamic response and instability failure process of the loess slope. The test results show that different parts of the slope have different vibration characteristics and the first natural frequency in the model increases with the increase of the slope height. The response acceleration of different parts may change due to the coupling relationship between the spectral characteristics of input wave and the natural frequencies of different parts of slope, suggesting the characteristics of regional differential dynamic response. Under the condition of different dynamic response, stress state and boundary conditions of different parts of slope, a rapid microstructural damage, cumulative residual deformation evolution, and tension-shear coupling instability failure process may appear at the top of the slope with the strong dynamic response associated with the increase of dynamic loading intensity. The Sd values presented in this paper may reflect soil damage and slope instability and failure.
Key words:  Loess slope  Shaking table  Dynamic response  Microstructure damage  Failure