Numerical Analysis of Seepage Field Response Characteristics of Weathered Granite Landslides under Fluctuating Rainfall Conditions
Author:
Yu Peng123ORCID, Shi Wenqing1, Cao Zhonghua1, Cao Xichong1, Wang Ran2, Wu Wenyu4, Luan Pengyu1, Wang Qigang5
Affiliation:
1. Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao Geo-Engineering Surveying Institute, Qingdao 266101, China 2. Key Laboratory of Coupling Process and Effect of Natural Resources Elements, Beijing 100055, China 3. Key Laboratory of Geological Disaster Risk Prevention and Control of Shandong Provincial Emergency Management Department (Under Preparation), Jinan 250014, China 4. Department of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China 5. Qingdao Geotechnical Investigation and Surveying Research Institue, Qingdao 266035, China
Abstract
The threat and destructiveness of landslide disasters caused by extreme rainfall are increasing. Rainfall intensity is a key factor in the mechanism of rainfall-induced landslides. However, under natural conditions, rainfall intensity is highly variable. This study focuses on the Fanling landslide and investigates the effects of varying rainfall intensity amplitudes, rainfall durations, and total rainfall amounts on landslide behavior. Three experimental groups were established, and ten rainfall conditions were simulated numerically to analyze the seepage field response of the landslide under fluctuating rainfall conditions. The results indicate that (1) there are positive correlations between the final pore pressure and both the amplitude and duration of rainfall intensity; (2) the pore water pressure response in the upper slope changes significantly, initiating deformation; and (3) the total rainfall amount is the most direct factor affecting the pore pressure response and landslide deformation. Compared to long-term stable rainfall, short-term fluctuating rainstorms are more likely to trigger landslides. These findings enhance our understanding of landslide mechanisms under fluctuating rainfall, providing valuable insights for disaster prevention and mitigation.
Funder
Open Foundation of the Key Laboratory of Coupling Process and Effect of Natural Resources Elements Open Foundation of Key Laboratory of Geological Disaster Risk Prevention and Control of Shandong Provincial Emergency Management Department
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