基于现场实测的库岸边坡变形和稳定性分析

Analysis of Deformation and Stability of Reservoir Bank Slope Based on Field Measurement

文章以某水电站库岸边坡为研究对象,对库岸边坡蓄前期、初蓄期进行监测,研究边坡变形并进行稳定性分析,得到边坡表面变形、深部变形的变化规律。结果表明:在蓄前期时,监测点变形值变化趋势相近,均为随着时间逐渐增大。进入初蓄期后,监测点的变形值均有较大的增加,滑坡类型属于牵引式滑坡;随着时间的推移,斜侧孔的位移逐渐增大,当孔深为0~33 m时,斜侧孔位移变化幅度不大,当孔深超过33 m时,斜侧孔位移出现波动,当孔深为76 m时,斜侧孔位移发生突变,突变位置为滑带位置;结合蓄水前期和初蓄期测点和测孔的变形特点可知,边坡在前期由于自重而产生整体蠕滑变形,当水库蓄水后,由于库水的渗透作用,边坡变形逐渐增大。

In this paper, a reservoir bank slope of a hydropower station is taken as the research object. The slope deformation and stability analysis are carried out to obtain the variation rules of surface deformation and deep deformation of the slope. The results show that in the early stage of storage, the deformation values of the monitoring points have a similar trend, which gradually increases with time. After the initial storage period, the deformation values of the monitoring points all increased greatly, and the landslide type belongs to traction landslide. With the passage of time, the displacement of the inclined side hole gradually increased. When the depth of the hole is in the range of 0m to 33m, the displacement of the inclined side hole changes little. When the depth of the hole exceeds33m, the displacement of the inclined side hole fluctuates, and when the depth of the hole is 76m, the displacement of the inclined side hole has a mutation, and the position of the sudden change is the position of the sliding belt. Combined with the deformation characteristics of the measuring points and holes in the early and initial storage periods, it can be seen that the whole creep deformation of the slope is caused by the dead weight in the early stage. When the reservoir is impounded, the deformation of the slope increases gradually due to the permeability of the reservoir water.