【Title】Discontinuous slope failures and pore-water pressure variation
【Author】GUO Xiao-jun1, 2, 3; LI Yong1, 2; CUI Peng1, 2, 4; ZHAO Wan-yu1; JIANG Xing-yuan1, 3; YAN Yan1,3
【Addresses】1 Key Laboratory of Mountain Hazards and Earth Surface Processes /Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 Asian Network on Debris Flow, Chengdu 610041, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China; 4 CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100049, China
【Citation】Guo XJ, Li Y, Cui P, et al. (2016) Discontinuous slope failures and pore-water pressure variation. Journal of Mountain Science 13(1). DOI: 10.1007/s11629-015-3528-4
【Abstract】Field experiments were conducted under artificial rainfallsto investigate the processes of soil failures on slope. It is found that the failures were temporally discontinuous and spatially discrete, with a wide range of magnitudes, accompanied by variations of soil moisture and pore-water pressure. Specifically, the experiments indicate that soil failures are more likely to occur on slope with high content of fine particles; the pore-pressure varies in response to soil failures in that the failures evidently affect the pore of the underlying soil. Migration of fine particles from upper to lower part of the slope also impacts the pore-water pressure variations in the slope profile. It is concluded that soil heterogeneity has a significant effect on variation in pore-water pressure, and fine particles transportation influences the building of pore-water pressure, as well as the mass depth, initial porosity, which is key to understanding the spatial characteristics of slope failures.
【Keywords】Slope failure; Rainfall; Infiltration;Pore pressure; Porosity