Model Test of Deformation Evolution and Multi Factor Prediction of Anchorage Slope Stability under Rainfall Condition
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ISSN 1674-487X
Model Test of Deformation Evolution and Multi Factor Prediction of Anchorage Slope Stability under Rainfall Condition Tingyao Wu
1
, Jianhong Jia2, Nan Jiang *1, Chuanbo Zhou1, Xuedong Luo1, Yuqing Xia1
1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China 2. Three Gorges Geotechnical Consultants Co., Ltd., Wuhan 430074, China Tingyao Wu: https://orcid.org/0000-0001-5314-2166; Nan Jiang: https://orcid.org/0000-0003-2709-840X ABSTRACT: The stability of the anchorage slope on the Baiyang Yangtze River Highway Bridge in Yichang, China, was investigated under different rainfall conditions using model test, numerical simulation, and factor analysis. The results of the study are as follows: (1) with the increase of rainfall intensity, the change of earth pressure can be divided into three stages. However, when the rainfall intensity was larger than a certain value, the change of earth pressure of cut slope became two stages; with the increase of rainfall intensity, pore water pressure increased with the increase of rainfall time, while at a certain stage after the rainfall, the pore water pressure in the cut slope did not decrease immediately, but increased for a period of time. (2) When the rainfall stopped, the stability coefficient of the anchorage slope continued to decrease, then slowly increased, and finally tended to be gentle. Meanwhile, when the rainstorm reached a certain intensity, the main factor that restricted the rainfall infiltration rate became the geotechnical permeability coefficient of the cut slope, which was no longer the rainfall intensity. (3) Factor analysis shows that the rainfall intensity and rainfall duration were the most important factors for anchorage slope stability, while earth pressure, pore water pressure and slope displacement were much less significant. KEY WORDS: anchorage slope, model test, rainfall condition, safety, factor analysis. 0
INTRODUCTION The main types of geological hazards in the Three Gorges Reservoir area are landslide, debris flow, collapse, land subsidence, earthquake, ground crack, immersion and karst collapse. According to incomplete statistics, there are more than 20 000 various types of geological disasters, among which the most harmful hazards with the largest number and the widest distribution are landslide, debris flow and collapse (e.g., Jiang et al., 2019; Yan et al., 2018; Huang, 2009). The terrain in this area is mainly mountainous and hilly, and geological disasters are triggered occasionally, such as debris flow and landslide. The types of geological hazards are basically shallow soil landslides induced by rainfall, with a thickness range of 1–3 m. Generally, the thickness of sliding bodies is less than 5 m. Rainfallinduced landslide disaster causes not only huge economic loss, but also casualties (e.g., Take et al., 2004; Mein and Larson, 1973). In this case, it is necessary to study the sliding mechanism of landslide under rainfall conditions. At present, the research on stability of rainfall-induced landsl
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