Effect of Pore Pressure Dynamics on Progressive Failure in a Clayey Glaciolacustrine Landslide

摘要: The cyclic fluctuations of matric suction and its influence on unsaturated soil mechanics in the active zone is largely disregarded in many slope stability calculations. However, the depth of the unsaturated zone can be significant, especially in semi-arid to arid climates where large portions of the slope are not governed by saturated soil mechanics. Additional tools are used to characterize historical climate and compare several factors that have resulted in changing landslide movement rates and magnitude. Infiltration of precipitation and snowmelt directly contributes to matric suction losses in the head scarp and is exacerbated by the presence of tension cracks. While groundwater levels are primarily correlated to changing movement rates in the Thompson River valley, seasonal changes in matric suction can influence the degree to which movement rates change. Climatic events and trends over the past few …