【摘要】 为定量化研究库水位骤降下不同非饱和参数对边坡的渗流特性以及稳定性的影响,根据非饱和渗流及抗剪强度原理,利用Geostudio的Seep/w与Slope/w模块对某边坡库水位骤降不同非饱和参数下的渗透稳定性进行了数值模拟研究,并根据正交实验分析法进行了敏感性分析,计算结果表明:库水位骤降下不同监测点孔压呈现先减小后不变的趋势,上部监测点的孔压降幅较下部监测点要小,孔压降幅与参数a,k呈负相关,而与参数m呈正相关;库水位骤降情况下上部监测点与下部监测点存在两个变形阶段,即库水位骤降时间段内的位移快速上升阶段以及库水位骤降结束后的位移缓慢上升阶段,上部监测点的位移要大于下部监测点的位移;参数a与参数k变动对安全系数的变幅影响较大,参数m与参数n对安全系数的变幅影响较小,参数a,m,k与安全系数呈正相关,而参数n与安全系数呈负相关;对非饱和参数对边坡稳定性进行了正交实验敏感性分析,参数a,m,n,k的敏感性大小分别为参数a≥参数k≥参数m≥参数n.更多还原

【Abstract】 In order to quantitatively study the influence of different unsaturated parameters on the seepage characteristics and stability of slope during sudden drop of reservoir water level, according to the principle of unsaturated seepage flow and shear strength, The seepage stability of a slope with different unsaturated parameters is simulated by Seep/w and Slope/w module of Geostudio; and the sensitivity analysis is carried out according to the orthogonal experimental analysis. The calculation results show that the pore pressure at different monitoring points decreases first and then remains unchanged during sudden drop of reservoir water level. The decrease of pore pressure at the upper monitoring point is smaller than that at the lower monitoring point; and the decrease of pore pressure is negatively correlated with the parameter a, k. During sudden drop of reservoir water level, there are two deformation stages in the upper monitoring point and the lower monitoring point, That is, the displacement of the upper monitoring point is larger than that of the lower monitoring point in the period of rapid rise of displacement during sudden drop of reservoir water level and the slowly rising stage of displacement of water level of reservoir at the end of sudden drop of reservoir water level. The variations of parameters a and k have a great influence on the amplitude of safety factor; while parameters m and n have little effect on the amplitude of change of safety factor; and parameters a, m have a positive correlation with safety factor; while parameter n has negative correlation with safety factor. The sensitivity of unsaturated parameters to slope stability is analyzed by orthogonal experiments. The ranging of sensitivities of parameters is a≥k≥m≥n.更多还原