Pore Pressure Fluctuations Within Quasi-Stable Slopes in South-Western Estonia and Their Influence on Slope Stability

摘要

Pore pressure fluctuations within slopes are widely considered as one of the most common landslide triggers. Ten automatic piezometers were installed within two quasi-stable slopes in south-western Estonia in order to record fluctuating pore pressures during a 2-year period. Pore pressure values and meteorological and hydrological data were studied by non-parametric correlation and cluster analyses in order to quantify the influence of external parameters. Data from 51 groundwater monitoring wells, covering the period from 1960 to 2009, were analysed in order to evaluate long-term changes in the underlying artesian aquifer. The development, refilling and movement of the groundwater depression were recorded. The pore pressure field was modelled with the finite element model and used as an input for slope stability analyses. Significant changes in slope stability were revealed. The influence of the ongoing climate change on slope stability is discussed.