【摘要】 库岸岩质高边坡的稳定性对水电站施工期和运行期的安全至关重要。首先,从降雨入渗和库水位变化两方面分析了地下水对岩质高边坡稳定性影响的机理。在此基础上,以茨哈峡水电站4#倾倒体为例,剖析了边坡的工程地质特征,运用离散化的有限元方法分析该边坡在降雨入渗、库水位上升和库水位骤降条件下的变形破坏特征,综合评价其稳定性。研究表明,库水位骤降使得岩体内部产生较大的动水压力,对边坡的稳定性影响很大;4#倾倒体受反倾结构面的影响,在水荷载作用下的变形模式为上部倾倒、下部滑移的组合形式,其失稳模式为牵引式倾倒破坏。该研究对实际工程的建设具有参考价值。更多还原

【Abstract】 The stability of high rock slope in the reservoir is crucial to the safety of hydropower station in construction and operation.Firstly,the influence mechanism of groundwater on the stability of rock slope is expounded from rainfall infiltration and reservoir water level change.On this basis,taking 4#toppling mass in Cihaxia Hydropower Station as an example,the engineering geological features are analyzed in detail.Furthermore,the discrete finite element method is used to analyze the failure characteristics of slope under the conditions of rainfall infiltration,reservoir water level rise and rapid drawdown,with the stability evaluated comprehensively.Research shows that the rapid drawdown of reservoir water level causes a large hydrodynamic pressure in rock mass,which has a great influence on slope stability.4#toppling mass is affected by the anti-dip structural plane,with the deformation mode under water load being the combination of upper toppling and lower sliding.The instability mode is the retrogressive-toppling failure.The study provides a reference value for the construction of practical engineering.更多还原