乌弄龙水电站库区拉金神谷坡体变形成因机制分析

Analysis on the Deformation Mechanism of Lakin-Shengu Slope in the Reservoir Area of Wunonglong Hydropower Station

以乌弄龙水电站库区拉金神谷坡体变形破坏为例,通过地质分析,揭示反向陡倾层状岩质斜坡早期倾倒折断后,受重力等外界因素作用折断带沿倾坡外的中缓倾结构面贯通并形成滑动面,产生滑移变形的历史成因机制。电站蓄水后,坡体受地下水位抬升影响,再次产生整体变形调整,随后变形减缓并趋于收敛。通过对勘探和监测成果的分析确定本次变形的成因和诱发因素,并进行稳定性评价和变形发展趋势预测。

Taking the deformation and failure of Lakin-Shengu slope in the reservoir area of Wunonglong Hydropower Station as study example,the historical progressive mechanism of sliding deformation is revealed through geological analyses,that is,after the early toppling and breaking of the reverse steep-dipping layered rock slope,the sliding surface is formed after the fracture zone is connected together along the low angle structural surface outside the inclined slope under the action of external factors such as gravity.After the reservoir is impounded,the slope is affected by the rise of underground water level,and the overall deformation is adjusted again,and then the deformation slows down and tends to converge.Based on the analysis of exploration and monitoring data,the progressive mechanism and inducing factors of the deformation are determined,and the stability evaluation and the deformation development trend prediction are also carried out.