Zhang Mengxiao, Wang Weizao, Hao Yinbo, Liu Xiaoyang, Zhang Ruisong, Tian Zhaomin, Huang Minuo, Zhang Jinmeng
School of Urban Geology and Engineering, Hebei GEO University, Shijiazhuang, 050031, China.
Hebei Technology Innovation Center for Intelligent Development and Control of Underground Built Environment, Shijiazhuang, 050031, China.
Sci Rep. 2025 Apr 30;15(1):15246. doi: 10.1038/s41598-025-98031-x.
The extremely heavy rainstorm on September 16, 2011, in Nanjiang County, Sichuan Province, induced many accumulative landslides. Most of these slopes were 3 ~ 5 m thick, sliding along the soil‒bedrock interface, and the dip angle of the sliding bed was 10 ~ 20°. To study the reasons for and stability of this type of landslide, which mainly involved sliding along the soil‒bedrock interface, this paper took the Qiling Village landslide as an example and conducted shear tests on the sliding bodies, sliding zone soils, and bedrock interfaces with different moisture contents and numerically simulated the stability of the slope.The research results revealed that the shear strength of the sliding soil and the soil‒bedrock interface decreased with increasing moisture content. The shear strength of the sliding soil‒smooth bedrock interface was the smallest; therefore, the landslide slid along the sliding soil‒smooth bedrock interface. Under the action of heavy rainfall, the water level continued to rise, and the pore water pressure gradually increased. The coupling of pore water pressure and rainwater softening caused the Qiling Village landslide. The stability of the slope was greatly affected by pore pressure in the early stage of rainfall, and the influence of rainwater softening was greater in the later stage.
2011年9月16日，四川省南江县的特大暴雨引发了众多堆积层滑坡。这些滑坡体大多厚3至5米，沿土层与基岩的界面滑动，滑床倾角为10至20°。为研究此类主要沿土层与基岩界面滑动的滑坡的成因及稳定性，本文以麒麟村滑坡为例，对不同含水量的滑体、滑带土及基岩界面进行了剪切试验，并对边坡稳定性进行了数值模拟。研究结果表明，滑带土及土层与基岩界面的抗剪强度随含水量增加而降低。滑带土与光滑基岩界面的抗剪强度最小，因此滑坡沿滑带土与光滑基岩界面滑动。在强降雨作用下，水位持续上升，孔隙水压力逐渐增大。孔隙水压力与雨水软化的耦合作用导致了麒麟村滑坡。降雨初期，孔隙压力对边坡稳定性影响较大，后期雨水软化作用影响更大。
