Discontinuous slope failures and pore-water pressure variation
- 139 Downloads
Field experiments were conducted under artificial rainfalls to 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.
KeywordsSlope failure Rainfall Infiltration Pore pressure Porosity
Unable to display preview. Download preview PDF.
- Cui P (1992) Studies on condition and mechanism of debris flow initiation by means of experiment. Chinese Science Bulletin 37(9): 759–763.Google Scholar
- Cui P, Zhu YY, Chen J, et al. (2007) Relationships between antecedent rainfall and debris flows in Jiangjia Ravine, China. In: Chen CL, Major JJ (Eds.), Debris Flow Hazard Mitigation: Mechanics, Prediction, and Assessment. Millpress, Rotterdam. pp 1–10.Google Scholar
- Sassa K (1984) The mechanism starting liquefied landslides and debris flows. In: Proceedings of 4th International Symposium on Landslides, Toronto: Toronto, Canadian Geotechnical Society, vol. 2, pp 349–354.Google Scholar
- Sassa K (1988) Geotechnical model for the motion of landslides. Special Lecture of 5th International Symposium on Landslides, Lausanne, Switzerland, vol. 1, pp 37–55.Google Scholar
- Sassa K (1996) Prediction of earthquake induced landslides. Special Lecture of 7th International Symposium on Landslides, Trondheim, Norway, vol. 1, pp 115–132.Google Scholar
- Sitar N, Anderson SA, Johnson KA (1992) Conditions leading to the initiation of rainfall-induced debris flows. Geotech. Eng. Div. Specialty Conf.: Stability and Perf. of Slopes and Embankments-II. ASCE, New York. pp 834–839.Google Scholar
- Takahashi T (1978) Mechanical characteristics of debris flow. Journal of the Hydraulics Division 104: 1153–1169.Google Scholar
- Zhou XJ, Cui P, Jia ST, et al. (2012) Flume test study on the movement of fine grains based on orthogonal design. Journal of Sichuan University (Engineering Science Edition) 44(Z1): 83–88 (In Chinese).Google Scholar