The role of infiltration processes in steep slope stability of pyroclastic granular soils: laboratory and numerical investigation

作者：Damiano Emilia^*; Olivares Lucio

来源：Natural Hazards, 2010, 52(2): 329-350.

DOI：10.1007/s11069-009-9374-3

• Pyroclastic soils
• Suction
• Flowslide
• Infiltration tests
• Numerical analysis

Rainfall-induced landslides on steep slopes are a common feature in much of Italy's mountain areas covered by shallow-pyroclastic deposits. Generally, these deposits are unsaturated and have a slope angle higher than 40A degrees aEuro"50A degrees; hence their stability is due to the positive effect of matric suction on soil shear strength. During rainfall, rainwater infiltration causes a decrease in suction, which in turn causes changes in soil mechanical and hydraulic properties, leading towards an instability process. However, the response of pyroclastic soil slopes to rainwater infiltration is not fully understood. The aim of this study is to link slope instability to the infiltration process on the basis of advanced geotechnical characterization, in situ monitoring and numerical analysis calibrated through a back-analysis of well-instrumented flume tests.

• 出版日期2010-2