1.Institute of Exploration Technology,China Geological Survey;2.School of Earth Sciences and Engineering,Nanjing University
The Dapo landslide, a typical non-wading debris landslide in the Three Gorges Reservoir area, occurred locally on June 17, 2017, resulting in road interruption and wall cracking of dozens of households outside the front area. To avoid aggravation of deformation due to activation of adjacent landslide groups in the rear and front area, it is of great practical significance to explore the deformation mechanism and evaluate the stability of the Dapo landslide. According to the field geological survey, borehole exploration, and in-situ monitoring, laboratory tests and model calculation, the genetic mechanism and triggering factors were investigated from geological and environmental aspects. The stability analysis was further carried out under two typical working conditions considering artificially activity and extreme rainfall. The results show that this is a shallow multi-level bedding rock landslide. Continuous heavy rainfall and human activities are the two main external factors affecting the landslide deformation, while the fluctuation of the reservoir water level has little effect. Strength weakening of sandstone, sandy shale, and carbonaceous shale under the thin-layer debris under the action of water erosion is the dominate internal cause of landslide deformation. The stability calculation results show that the formation and development of the landslide is promoted by human activities and devastatingly affected by extreme precipitation. The combined treatment scheme of anti-slide pile sheet wall and interception and drainage system was also recommended. The conclusion remarks in this study have reference significance for the formation mechanism analysis and anti-slide treatment of non-wading landslides in the reservoir area.
李厚芝,叶 霄,朱鸿鹄,等. 三峡库区大坡滑坡成因机制分析及稳定性评价[J]. 科学技术与工程, , ():复制