关键词: 滑带土, 周期性渗透压, 渗流-应力耦合, 蠕变特性

Abstract: The sliding-zone soil plays an important role in controlling the deformation evolution of landslides, making the study of its creep characteristics under seepage-mechanical coupling significant for understanding the evolution of reservoir landslides. This research focuses on the sliding-zone soil from the Majiagou landslide in the Three Gorges Reservoir area, conducting pore pressure tests and triaxial creep experiments under cyclic seepage-mechanical coupling. The study analyzes the dynamic effects of cyclic seepage pressure, the transmission and distribution of pore water pressure of sliding-zone soil samples, and the response of sliding-zone soil creep to seepage pressure under different stress levels. The results indicate that cyclic seepage pressure affects the deformation of the sliding-zone soil by influencing the transmission and dissipation of pore water pressure within the sample. As the number of cycles increases, the pore water pressure within the sample tends to stabilize and exhibits a parabolic distribution. Under the influence of cyclic seepage pressure, the sliding-zone soil exhibits "stick-slip creep" behavior; when the deviatoric stress is low, the creep of the sliding-zone soil shows significant fluctuations in response to cyclic seepage pressure. However, when the deviatoric stress exceeds 900 kPa, the response of the sliding-zone soil to seepage pressure becomes less pronounced.