Exploring mechanism of hidden, steep obliquely inclined bedding landslides using a 3DEC model: A case study of the Shanyang landslide in Shaanxi Province, China

Abstract

Catastrophic geological disasters frequently occur on slopes with obliquely inclined bedding structures (also referred to as obliquely inclined bedding slopes), where the apparent dip sliding is not readily visible. This phenomenon has become a focal point in landslide research. Yet, there is a lack of studies on the failure modes and mechanisms of hidden, steep obliquely inclined bedding slopes. This study investigated the Shanyang landslide in Shaanxi Province, China. Using field investigations, laboratory tests of geotechnical parameters, and the 3DEC software, this study developed a numerical model of the landslide to analyze the failure process of such slopes. The findings indicate that the Shanyang landslide primarily crept along a weak interlayer under the action of gravity. The landslide, initially following a dip angle with the support of a stable inclined rock mass, shifted direction under the influence of argillization in the weak interlayer, moving towards the apparent dip angle. The slide resistance effect of the karstic dissolution zone was increasingly significant during this process, with lateral friction being the primary resistance force. A reduction in the lateral friction due to karstic dissolution made the apparent dip sliding characteristics of the Shanyang landslide more pronounced. Notably, deformations such as bending and uplift at the slope's foot suggest that the main slide resistance shifts from lateral friction within the karstic dissolution zone to the slope foot's resistance force, leading to the eventual buckling failure of the landslide. This study unveils a novel failure mode of apparent dip creep-buckling in the Shanyang landslide, highlighting the critical role of lateral friction from the karstic dissolution zone in its failure mechanism. These insights offer a valuable reference for mitigating risks and preventing disasters related to obliquely inclined bedding landslides.

Keywords

Landslide / Steep obliquely inclined bedding slope / Failure mode / Failure mechanism / Apparent dip creep-buckling / Lateral friction / 3DEC model / Landslide numerical model / Geological hazards survey engineering

CRediT authorship contribution statement

Jia-yun Wang analyzed the field geological phenomena and investigated the failure process of the Shanyang landslide using 3DEC software. Zi-long Wu carried out the experiment and analyzed the data. Xiao-ya Shi analyzed the field geological phenomena and numerical simulation data. Longwei Yang, Rui-ping Liu and Na Lu analyzed the test data and contributed to the interpretation of the results. All authors discussed the results and contributed to the final manuscript.

Declaration of competing interest

The authors declare no conflicts of interest.

Acknowledgment

This research was jointly supported by the projects of the China Geological Survey (DD20230092 and DD20201119).The authors are indebted to Prof. Yue-ping Yin, Zhi-xin Chen, Dr. Sai-nan Zhu and Zhen Feng for their valuable advice and comments in this study.

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