Yang Hao, Wang Na, Wen Xingyu, Huang Min, Wan Jian, Huang Xue
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, Sichuan, China.
Sichuan College of Architectural Technology, Deyang, 618000, Sichuan, China.
Sci Rep. 2025 Mar 12;15(1):8489. doi: 10.1038/s41598-025-93306-9.
Landslides are one of the most common natural disasters worldwide. On September 27, 2020, a large-scale landslide occurred in the Tianzhulin area of Huangni Village, Wenjiang Town, Gao County, known as the Wachangwan Landslide. Through field investigations and UAV aerial photography, the causes and deformation processes of the Wachangwan landslide were thoroughly revealed. Additionally, the displacement and deformation of the landslide were analyzed using the discrete element method. The key findings are as follows: The Wachangwan landslide is a typical multistage landslide. Prolonged heavy rainfall induced sliding in the front part of the landslide body, which dragged the rear, less stable soil mass, further exacerbating deformation and eventually forming a multistage landslide. The non-sliding zone is located between zones III-1 and III-2, influenced by pressure from adjacent sliding zones. However, based on rainfall data and displacement monitoring, the non-sliding zone remains generally stable at present. Using the discrete element method, the deformation mechanism and subsequent evolution of the Wachangwan landslide under rainfall conditions were analyzed. The landslide exhibited a failure mode characterized by traction, tensile fracturing, and sliding. A stability calculation method for multistage landslides under rainfall conditions was established, combining the traditional transfer coefficient method and the multistage landslide effects. By analyzing the current stability of the Wachangwan landslide, the results provide a novel approach for evaluating the stability of multistage landslides.
山体滑坡是全球最常见的自然灾害之一。2020年9月27日，高县文江镇黄泥村天竺林区域发生了一次大规模山体滑坡，即瓦厂湾滑坡。通过现场调查和无人机航拍，全面揭示了瓦厂湾滑坡的成因及变形过程。此外，采用离散元法对滑坡的位移和变形进行了分析。主要研究结果如下：瓦厂湾滑坡是典型的多级滑坡。持续的强降雨引发滑坡体前部滑动，拖动后部稳定性较差的土体，进一步加剧变形，最终形成多级滑坡。非滑动区位于Ⅲ-1区和Ⅲ-2区之间，受相邻滑动区压力影响。然而，根据降雨数据和位移监测，非滑动区目前总体保持稳定。利用离散元法分析了降雨条件下瓦厂湾滑坡的变形机制及后续演化过程。该滑坡呈现出以牵引、拉伸破裂和滑动为特征的破坏模式。结合传统传递系数法和多级滑坡效应，建立了降雨条件下多级滑坡的稳定性计算方法。通过分析瓦厂湾滑坡的当前稳定性，研究结果为评估多级滑坡的稳定性提供了一种新方法。
