下降速率对不稳定库岸边坡的内力影响分析

Analysis of the Influence of Descent Rate on the Internal Forces of Unstable Reservoir Bank Slopes

位于金沙江电站库区范围的丽宁公路边坡,受库水位升降影响已发生多次崩塌滑坡,本文通过GEO-SLOPE软件,建立该区域丽宁公路边坡二维渗流稳定模型,模拟库岸在水库水位不同下降速率情况下的安全稳定情况,得出随着水库水位下降速率越大,库岸越不稳定,孔隙水压力越小,法向力抗剪力不断增大,土体安全系数会有所提高等规律,并提出相关的边坡防止措施,为该路段边坡的处理及之后新公路的修建提供相关依据。

The slope of the Lining Highway,located within the reservoir area of the Jinsha River Power Station,has experienced multiple collapses and landslides due to the influence of water level fluctuations.This article uses GEO-SLOPE software to establish a two-dimensional seepage stability model for the slope of the Lining Highway in this area,and simulates the safety and stability of the reservoir bank under different water level drop rates.It is found that as the water level drop rate of the reservoir increases,the reservoir bank becomes more unstable,the pore water pressure decreases,the normal force shear force continues to increase,and the soil safety factor will be improved.Relevant slope prevention measures are proposed to provide relevant basis for the treatment of the slope in this section and the construction of new highways in the future.