摘要
针对库水位+降雨条件下的边坡渗透稳定性研究缺少定量化敏感性分析的问题,利用Geostudio软件模拟了三峡库区某边坡在库水位骤降及库水位骤降+降雨条件下的渗透稳定性规律,同时基于灰色关联度理论对不同边坡物理力学参数进行了稳定性的定量化敏感性分析。结果表明,库水位骤降条件下不同监测点的孔压均随时间增加逐渐下降,在叠加降雨过程时孔压有一个"突升";库水位骤降下的安全系数先减小后增大,降雨发生在第18~20d时安全系数最小;粘聚力c、内摩擦角φ、饱和渗透系数k对边坡稳定性影响较大,而重度γ对边坡稳定性的影响相对较小。
In view of the lack of quantitative sensitivity analysis in the study of slope seepage stability under reservoir water level combined rainfall,the seepage stability law of a slope in the three Gorges Reservoir area under rainfall at different times is numerically simulated by using Geostudio software,which is characterized by the sudden drop of water level in the reservoir and the sudden drop of water level in the reservoir at different times.At the same time,the quantitative sensitivity analysis of the stability of different slope physical and mechanical parameters is carried out based on the grey correlation degree theory.The results show that the pore pressure variation law of different monitoring points under the condition of sudden drop of reservoir water level decreases gradually with time.In the process of superimposed rainfall,there is a"sudden rise"of pore pressure.The safety factor under the sudden drop of reservoir water level decreases first and then increases,the safety factor is the smallest when rainfall occurs in 18-20 days.The influence of cohesion force c,internal friction angle and saturated permeability coefficient k on the slope stability is greater,but the influence of heavyγon the slope stability is relatively small.
作者
张珂峰
ZHANG Ke-feng(Institute of Architectural Engineering,Nantong Open University,Nantong 226000,China)
出处
《水电能源科学》
北大核心
2019年第12期99-102,共4页
Water Resources and Power
基金
国家自然科学基金项目(61503201)
关键词
库水位骤降
降雨
边坡稳定
灰色关联度理论
数值模拟
sudden drop of reservoir water level
rainfall
slope stability
grey correlation degree theory
numerical simulation
