Mechanism of bending-sideslip of inclined thick bedding slope: A case study of Qingkou landslide in Wulong, Chongqing
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摘要:
重庆武隆庆口滑坡发育在斜倾厚层陡崖带上，下方数百年的煤矿开采形成了大面积的采空区。基于对地质条件、采空区现状和山体变形特征的分析，发现该滑坡既有弯曲张拉变形又有侧向滑移变形，提出了弯曲-侧滑破坏模式。根据山体变形历史，分弯曲变形和滑移变形两个阶段，分析了滑坡变形特征，研究了岩层面产状变化。并根据层面与临空面组合关系，将山体破坏分为弯曲张拉破坏、楔形体破坏和平面滑动破坏3个阶段，建立了各破坏阶段的判据，揭示了弯曲-侧滑型滑坡演变规律和形成机理，为该类滑坡防灾减灾提供了科学依据。
Abstract:The Qingkou landslide in Wulong, Chongqing, has developed on an inclined thick abrupt cliff, with a large area of goaf formed due to hundreds of years of coal mining below. Based on the analysis of the geological conditions, current goaf situation, and deformation characteristics of the mountain, it is identified that the landslide exhibits both bending-tension and sideslip deformations, suggesting a bending-sideslip failure mode. The deformation history of the mountain is examined, and the deformation characteristics of the landslide are analyzed in two stages: bending deformation and sideslipping deformation. Change in the rock surface occurrence are studied accordingly. Considering the combination relationship between bedding and the free face, the mountain failure is divided into bending-tension failure, wedge failure and plane-sliding failure. Criteria for each failure stage are established, revealing the evolution rules and formation mechanism of the bending-sideslip landslide. This study provides a scientific basis for the disaster prevention and mitigation of such landslides.
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表 1 滑体变形统计表
Table 1. Statistical table of deformation for the land slide body
剖面位置 裂缝总宽度/m 采深/m 偏转角度/（°） 2-2′剖面 1.6 114.5 0.8 3-3′剖面 2.6 99.8 1.7 4-4′剖面 4.3 45.4 5.4 5-5′剖面 4.9 44.5 6.3 
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表 2 层面变形计算值
Table 2. Calculated data of bedding deformation
/（°） 剖面位置 b1 δ α2 β2 α2* β2* 2-2′剖面 64 0.8 198.3 12.7 191 11 3-3′剖面 82 1.7 202.6 12.9 202 12 4-4′剖面 82 5.4 218.8 13.4 216 14 5-5′剖面 85 6.3 222.0 13.9 230 15 注：1. 陡崖走向约305°，失稳临空面走向约40°；2. 带*为现场实测值。
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