Abstract
Slope stability issue in red clay slopes during rainfall is one among the serious geoenvironmental disasters in China. In order to investigate the effect of long duration rainstorm on red-clay slopes, studies were conducted using Geostudio 2012. Five different rainfall-durations were applied to the slope and the results of coupled and uncoupled calculation modes were compared. Results show that pore water pressure increased due to the dissipation of matric suctions and rise in water table during the rainfall period with the longer the rainfall duration, the larger the pore water pressure. The rate of change of pore water pressure was largest at rainfall durations of 4 days, among all the duration conditions considered for this study. After short duration rainstorms, a settlement of the surface of the slope was observed. However, in long duration rainstorms, the slope surface swelled in a non-uniform manner with the head of the slope experiencing the greatest expansion. Factor of safety exhibited a hysteresis during the calculation process, which was similar in trend with the pore water pressure as well, and it showed some amplitude during the calculation steps under the coupled calculation analysis as a result of the deformation and seepage force affecting each other on the performance of slope, especially for the slope stability.
Highlights
Slope stability issue in red clay slopes during rainfall is one among the serious geoenvironmental disasters in China
The results indicated that greater the rainfall intensity is, the larger the difference between the coupling and uncoupling condition is for the factor of safety of the slope
Results from each step were utilized to evaluate the change in pore-water pressure, stress, strain, displacement, deformation and water table of the slope with rainfall
Summary
Slope stability issue in red clay slopes during rainfall is one among the serious geoenvironmental disasters in China. The south region of Changjiang River in China that has hot and humid climatic conditions is not an exception. These regions are susceptible to rainfallinduced slope failure issues, which is one among the major geo-disasters in China. Past experiences show that slope failures generally occur during or after the rainfall event; for an example at about 6:40 pm local time on 24 June 2015, a huge landslide occurred on the north bank of Daning River in Chongqing city, China after a heavy rainfall for a few days. How the characteristics of rainfall, namely, rainfall intensity and duration, antecedent rainfall, and rainfall patterns affects the slope stability are well researched topics and many prominent theories about the slope failure mechanism have been published in literature
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