李家峡水电站坝前Ⅰ号滑波处理稳定性评价

A Fvaluation on the Stability for Dispose ofⅠLandslide in Forant of Lijiaxia Hydropower Dam

李家峡水电站坝前发育有Ⅰ号大型深层岩质滑坡，自１９８３年以来一直处于等速蠕动变形状态，失稳下滑的可能性增强。为确保电站安全运行起见，对Ⅰ号滑坡高程２２００ｍ以上的滑体进行了削方处理，并采用加载反压法的防护措施。为了对处理前后滑体稳定性有一比较确切的了解，采用速推系数法对滑体处于各种库水位变化情况下的稳定性进行了重新评价。

There isⅠlarge-scaled and deep rocky landslide in farnt of Lijiaxia hydropower dam.Manitorins system,on and under the ground,has been established since 1983. Many years' manitoring data demenstrate that there exists creep deformation in landslide body. During the construction and operatian,the possibility of losing its stability and sliding downnard erhances underthe influcence of some new factors. In order to assure the safe operation,landslide was cut above altitude of 2200m, and the measurement of load was taken in the toe. In order to have a correct understanding of stability ofⅠlandslide before and after discoal,the stability of landslide body along with the changing of reservoir stare has been evaluated again by means of the coefficient recurrence method.