Instability mechanism and control measures of loess slope induced by heavy rainfall
Guangcheng Shi
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorXiaojie Yang
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorCorresponding Author
Fan Yang
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorZhigang Tao
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorXiaoyu Zhang
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorJie Dong
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorGuangcheng Shi
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorXiaojie Yang
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorCorresponding Author
Fan Yang
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorZhigang Tao
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorXiaoyu Zhang
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorJie Dong
State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing, Beijing, China
School of Mechanic and Civil Engineering, China University of Mining and Technology, Beijing, Beijing, China
Search for more papers by this authorAbstract
Loess slopes are susceptible to rainfall due to the water sensitivity and collapsibility of loess. The aim of this study is to investigate the instability mode, failure mechanism and control effect of homogeneous loess landslide under rainfall by using physical model experiments and numerical simulation, combined with a new anchor cable with negative Poisson ratio (NPR) structural effect. The findings indicated that the loess slope's failure under heavy rainfall is characterized by progressive shallow flow-slip instability, encompassing three deformation modes and seven deformation characteristics. Water content, pore water pressure and earth pressure monitoring instruments capture the dynamic response of internal hydromechanical properties within the loess slope during intermittent heavy rainfall, clarifying its failure mechanism. Rainfall leads to soil softening and a reduction in strength. The effective stress of shallow soil and potential sliding surfaces diminishes due to decreased matrix suction and increased pore water pressure. The accumulation of internal and external deformation eventually leads to the disintegration of the shallow layer of the loess slope. Numerical simulation results indicated that rainfall significantly affects the shallow layer of the loess slope, with greater subsidence deformation observed at the slope's crest. Indoor and field monitoring findings revealed the pattern of Newton force on the loess slope in response to rainfall and demonstrated its seasonal dynamics, characterized by an increase during the thaw-collapse and flood periods, followed by a decrease in the frost-heave period.
CONFLICT OF INTEREST STATEMENT
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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