三峡库区青石滑坡应急监测及变形演化趋势研究

Study on Emergency Monitoring and Deformation Evolution Trend of Qingshi Landslide in the Three Gorges Reservoir

青石滑坡是三峡库区蓄水期间,库水位上升诱发的典型滑坡,库水入渗是滑坡险情产生的主导因素。根据滑坡的实际情况及变形趋势设计了应急监测方案,分区进行布控监测,从位移监测数据分析结果可知,滑坡体总体上属于牵引式变形趋势。A区变形牵引B区变形后,从而导致D区的变形,C区的次级变形区前期受B区变形及D区变形影响,后期影响D区变形。从变形演化趋势上,经过2个水文年的调整和适应后,变形量基本保持不变,虽滑坡体逐渐恢复到新的平衡状态,库水升降对滑坡体稳定性影响较小,滑坡体趋于稳定状态,但必须做好排水工程,以保安全。

Qingshi landslide is a typical landslide that is induced during the impoundment of Three Gorges Reservoir by the water level rise therein. The reservoir water infiltration is the primary factor causing landslide danger. According to the actual situation and deformation trend of the landslide, such emergency monitoring scheme that the surveillance was arranged in zones was designed. From the analysis of displacement monitoring data, it was known that the landslide body had a tendency of tractive deformation in general, that is to say, the deformation in Zone A dragged the deformation in Zone B and then caused the deformation in Zone D; for the secondary deformation area in Zone C, in the early stage, it was affected by the deformation in Zone B and D; and in the late stage, it affected the deformation in Zone D. However, from the deformation evolution trend, after two-hydrological-year adjustment and adaptation, the amount of deformation will keep the same substantially, the landslide will recover to a new balance gradually, and the water level in the Reservoir, whether increase or decrease, will have minor effect on the landslide stability, thus the landslide tends a stable state. However, the drainage works must be done well to ensure the safety.