The anti-dip bedding rock slopes have threatened global infrastructure construction and urban expansion seriously. Taking the Guang'an Village rockslide as an example, this paper firstly studied the deformation characteristics of the rockslide with anti-dip bedding structure based on in-situ investigation and monitoring, and then the relevant influencing factors were summarized. On this basis, a new evolution model of continuous-pushing-section pressing locked-section and the instability mechanism of the rock slope were proposed. Finally, the applicability of the model and the deformation tendency of the rock slope were further discussed. A catastrophic sliding event has once occurred in the Guang'an Village rockslide in 2017, after which the deformation of the potential source area III (PSA-III) was accelerating. The presence of the sliding-prone geological structure provides the basic conditions for the deformation of the rock slope and the development of the sliding zone. Rainfall is the major external trigger that promotes the deformation. As the sliding zone extends forward, the overlying deformation body will keep on pushing against the preceding rock mass, which will contribute to the forward extension of the sliding zone as well. When the final locked section is crushed, the rock slope will lose balance. According to the observation in the field, the PSA-III is in the late stage of the deformation-increasing phase currently. This study can provide a reference for the analysis of failure mechanism and the design of monitoring and mitigation of other large anti-dip bedding rock slides.

中文翻译：

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大型反倾岩滑坡变形特征及失稳机制

反倾层理岩边坡严重威胁着全球基础设施建设和城市扩张。以广安村岩体滑坡为例，基于现场勘察和监测，首先研究了抗倾层理结构岩体滑坡的变形特征，并总结了相关影响因素。在此基础上，提出了连续推挤锁断段演化新模型及岩质边坡失稳机理。最后进一步讨论了模型的适用性和岩质边坡的变形趋势。 2017年，广安村曾发生过一次特大滑坡事件，随后潜在源区Ⅲ（PSA-Ⅲ）变形加速。易滑地质构造的存在为岩质边坡的变形和滑动带的发育提供了基本条件。降雨是促进变形的主要外部触发因素。当滑动带向前延伸时，上覆变形体将不断推挤前面的岩体，这也将有助于滑动带向前延伸。当最终锁定的部分被压碎时，岩坡就会失去平衡。根据现场观测，PSA-III目前处于变形增大阶段的后期。该研究可为其他大型反倾层岩滑坡破坏机理分析及监测缓解设计提供参考。