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库岸边坡的变形破坏及稳定性研究是目前国内外研究的热点之一。基于水电站库区一大型堆积体边坡,通过现场原位直剪试验获取岩土体的力学参数,利用岩土数值分析FLAC3D软件,考虑了堆积体与基岩基覆接触带介质的应变软化特性,对水库蓄水和下降过程中边坡的变形破坏特征进行了分析预测。结果表明,在库水升降作用下变形主要发生在堆积体内部;根据堆积体的变形特征可分为3个区:前缘牵引变形区,变形量最大;中间过渡区,变形量最小;后缘被牵引变形区,变形量介于前缘和中间之间。模拟过程中,在坡体的不同位置设置位移监测点,得到了蓄水和水位下降过程中各监测点的位移时程曲线,监测结果显示,水位下降时堆积体前缘易形成局部失稳。通过剪应变增量判断堆积体边坡在库水作用下可形成2个潜在的滑动破坏面。
The research on the deformation, failure and stability of the bank slope is one of the hotspots at home and abroad. Based on a large pile slope of reservoir area in hydropower station, the mechanical parameters of rock and soil were obtained by on-site direct shear test. By using the numerical analysis software FLAC3D, the strain-softening characteristics of the media of contact between bedrock and bedrock were considered , The deformation and failure characteristics of the slope during the storage and descent of the reservoir were analyzed and predicted. The results show that the deformation occurs mainly in the interior of the deposit under the action of the reservoir water. According to the deformation characteristics of the deposit, it can be divided into three zones: the frontal traction zone has the largest deformation; the intermediate zone has the least deformation; the trailing edge Traction deformation zone, the deformation between the front and middle. During the simulation, the displacement monitoring points were set up at different positions of the slope body, and the displacement history curves of each monitoring point in the process of water level and water level drop were obtained. The monitoring results showed that the leading edge of the pile body tends to form local instability when the water level drops. Judging by the increment of shear strain, two potential sliding failure planes can be formed under the action of reservoir water.