三峡库区巴东县谭家坪滑坡防治工程研究

为了对整个滑坡进行系统综合治理,在综合分析滑坡工程地质条件的基础上,对谭家坪滑坡稳定性进行了计算与评价。结果表明,滑坡的稳定性系数较低,安全储备不高,在175 m库水位降至145 m库水位以及175 m库水位与饱和地下水(暴雨)叠加烈度6度地震的状态下,谭家坪滑坡处于临界滑移破坏阶段。因此,应从根本上消除其变形破坏带来的灾害。对谭家坪滑坡而言,治理工程应重点针对滑坡的中部与前缘部位,并考虑库岸再造的影响,既要治理滑坡的整体蠕滑,又要治理浅表层崩滑。依据这个原则,比选了多种防治方法,最后确定采用大截面抗滑桩为主、辅以挡土墙和坡内排水系统的防治方案。施工结果表明,该治理方案经济合理.抗滑效果好。

Study of Stabilization Work of Tanjiaping Landslide in Three Gorges Reservior Area

The Tanjiping landslide is situated in the layout zone of Badong City in Three Corges Reserviorarea. The Yanjiang highway in the new town passes through the landslide, which influences severely thenavigation safety of Changjiang. In order to control the landslide systematically, stabilization measures aretaken at altitude of 9. 1m based on comprehensive evaluation of engineering geological conditions. Thestudy result shows that the safety factor of the landslide is rather small and will be at the critical state ifthe reservior water level draws down from 175 m to 145 m or rainstorm and earthqnake of intensity Ⅵoccur while the reservior water level is at 175 m. Therefore the landslide must be controlled systematicallyand comprehensively so that the disater caused by landslide deformation and destruction could beprevented. As for the Tanjiaping landslide, the stabilization work should be focused on the middle andfront part of the landslide controlling not only the creep of the whole slide mass but toppling of groundsurface. According to this principle the feasibilites of serveral stabilization measures are compared, thenslide-resistant piles of large sectional size including cantilever piles and anchoring piles are used,accompanied by retaining walls and drainage system of landslide interior. Results show that the measure iseconomically reasonable and convenient for construction.