The Deformation and Instability Characteristics of Fractured Landslides during Typhoon-Triggered Rainstorms: Observations from an In Situ Field Experiment

Fractures are the dominant conditions for rainfall infiltration into slopes, which can aggravate instability of landslides. However, few studies have been conducted to analyze in detail and deformation characteristics creeping landslides with fractures. In view this, this study investigated a landslide Fu’ao Village, Wencheng County, Zhejiang Province China determine how fractures affect during heavy through an situ simulation experiment. experiment, three consecutive days were set up based on Typhoon Megi 2016, two simulated, namely, + water filling filled (also referred as first second conditions, respectively). The changes volumetric content (VWC), pore pressure (PWP), deep displacement at depth less than 5 m under observed using field monitoring instruments. results follows: (1) shallow soil showed more sensitive time-varying response rainfall, while that 200 cm lagged lag about 10 h, decreased significantly case unfilled fractures; (2) Under condition, different depths almost same changing amplitude kPa or less. increased reaching 30 kPa; (3) borehole equipped inclinometers near front slope was higher rear slope. condition 6 mm, greater condition. Therefore, significant effects induced by typhoon-triggered rainstorms, one important measure prevent control type is fill time.