唐家山滑坡后壁残留山体震后稳定性研究

 在对残留边坡现场地质调查基础上，根据坡体表部裂缝分布、延伸长度和贯入深度，结合唐家山高速滑坡形成机制，推测残留山体除表层零星塌滑外，仍存在较大规模滑坡的可能，其破坏模式以坡顶拉张裂缝贯穿下错→坡体中部沿顺层滑移→前缘切层剪切破坏的拉裂–滑移–剪断三段式为特点。根据该破坏模式，对残留山坡分别考虑在天然、持续暴雨以及地震等不同工况下，按二维和三维折线型潜在滑面进行稳定性计算和分析。结果表明，残留山坡整体稳定，但浅表部稳定性差。在此基础上，对残留山坡提出相应的整治措施建议。

STUDY OF STABILITY OF REMNANT MOUNTAIN BODY IN BACK SCARP OF TANGJIASHAN LANDSLIDE AFTER "5.12" WENCHUAN EARTHQUAKE

Based on the field geological investigations of remnant slope as well as the distribution,scale and penetration depth of crack in slope surface,combined with the mechanism of Tangjiashan high-speed landslide,it is presumed there is still the possibility of that the large-scale landslide except for the sprinkling rockfall occurs on the surface of remnant mountain body. The large-scale landslide failure mode is:tension cracks of slope crest penetrate through bedrock,bedding landslides take place on the middle slope and shear oblique layer on the bottom,and the characteristics can be expressed with tension-sliding-shearing model. According to the failure mode,considering different conditions of natural,continuous rainstorm as well as earthquake,the stability calculation and analysis of remnant mountain body by two-dimensional and three-dimensional broken line potential sliding surfaces are carried out. The results show that the remnant mountain body is stable wholly,but the shallow surface stability is unfavorable,and the control measures to remnant mountain body are proposed.