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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。
During the trial operation of the Three Gorges Project, the deformation of the landslide in the reservoir area is obviously different due to the difference of geological structure and permeability. Therefore, in addition to studying the geological structure of the landslide, the stability of different permeability landslides under the variation of reservoir water should be strengthened Response law research. Taking the Huangjingshu landslide in the first area of the Three Gorges Reservoir as an example, the seepage field characteristics of four different permeability landslides were analyzed when the water level varied from 0.5 to 2.0 m / The rate of change of stability is the evaluation index, and the variation of landslide stability under the condition of sliding body permeability and the variation of reservoir water is studied. The results show that when the influence coefficient of reservoir water is between -0.107 and -0.322, the stability change rate β is the largest, and the increase rate β of landslide stability decreases with α decreasing. When α is between -0.644 and -769.231, The stability increase rate β is not obvious; when α is in the range of 576.923 ~ 769.231, the stability of landslide decreases less when the water level rises; when α is 0.107 ~ 384.615, the correlation coefficient α and stability change rate β Not obvious. The result has a strong application value for the monitoring and early warning of landslides in the reservoir area.