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受三峡库区175 m水位蓄水影响,引起了古滑坡复活,前后缘出现了大规模的变形,坡体的稳定性降低,直接威胁到景区、航道、电站的安全。本文根据滑坡的地形地貌及滑坡变形的监测数据,结合所处的地质环境条件,对滑坡的复活机理进行了系统的分析,在此基础上采用极限平衡法和FLAC数值模拟方法分析了滑坡的稳定性,得到滑坡目前处于基本稳定状态。滑坡属于牵引式滑移,其整体的稳定性取决于滑坡前缘强变形B、C区的稳定,若前缘强变形区再次发生大规模变形破坏,势必影响滑坡的整体稳定性。最后,针对滑坡提出了采用专业监测预警+裂缝封闭+截排水沟+清除前缘垮塌区表面危险岩块的综合防治方案的建议。
Affected by the water level of 175 m in the Three Gorges Reservoir Area, the ancient landslide was resurrected. Large deformations occurred at the front and back edges, and the stability of the slope was reduced. This posed a direct threat to the safety of scenic areas, navigation channels and power stations. In this paper, the landslide’s topography and landslide deformation monitoring data, combined with the geological and environmental conditions in which the landslide’s resurrection mechanism is systematically analyzed. Based on this, the method of limit equilibrium and FLAC numerical simulation are used to analyze the stability of the landslide Sexually, the landslide is now basically stable. The landslide belongs to the traction type. The overall stability of the landslide depends on the stability of the strong deformation areas B and C of the landslide front. If large-scale deformation and failure occur again in the strong deformation area of the landslide, it is bound to affect the overall stability of the landslide. At last, aiming at the landslide, we put forward the proposal of using comprehensive monitoring and early warning + crack closure + cutoff ditch + removal of dangerous rock blocks on the surface of the collapse area.