基于滑体渗透性与库水变动的滑坡稳定性变化规律研究

在三峡工程试运行期间,库区滑坡因地质结构和渗透性的不同,其变形情况存在明显差异,因此,除研究滑坡地质结构外,还应加强不同渗透性滑坡在库水变动下的稳定性响应规律研究。以三峡水库库首区黄荆树滑坡实例为计算模型,分析库水位在175～145 m间以0.5～2.0 m/d变化时4种不同渗透性滑坡的渗流场特征;再以库水影响系数α和稳定性变化率为评价指标,研究在滑体渗透性和库水变动条件下的滑坡稳定性变化规律。研究表明,当库水影响系数α在-0.107～-0.322时,稳定性变化率β最大,且随α减小滑坡稳定性增加率β减小;当α在-0.644～-769.231时,随α减小稳定性增加率β变化不明显;当α在576.923～769.231时,库水位上升时滑坡稳定性降低较少;当α在0.107～384.615时,影响系数α与稳定性变化率β的相关性不明显。其结果对于库区滑坡的监测预警有较强的应用价值。

Base on permeability of landslide and reservoir water change to research variational regularity of landslide stability

During the trial operation of the Three Gorges Project,there are remarkable differences between the deformation of landslides due to different geological conditions and permeabilities.Therefore,besides the geological structure,more attention should be paid to study the regularity of stability variation of different permeability landslides under the condition of reservoir level change.Taking the Huangjingshu landslide at the head area of the Three Gorges as the computation model,the seepage field of 4 landsl...