旭龙水电站石料场高陡边坡分级开挖模拟

Simulation on staged excavation of high and steep quarry slope of Xulong Hydropower Station

金沙江旭龙水电站徐龙石料场开采高度高达280 m,距大坝等重要水工建筑物较近,为分析在不同开挖步下,该料场高陡岩质边坡的变形及稳定性特征,建立了料场分级开挖有限元模型。结果表明:①徐龙料场开采过程中边坡变形较大区域由原坡脚向开挖新形成的坡脚不断变化;②随着开挖的进行,徐龙石料场最大主应变较大区域发生“分岔”,最不利滑动圆弧由原边坡坡脚逐渐移动至开挖新形成的坡脚处;③不同开挖步下的徐龙石料场整体稳定性满足要求。研究成果可以为类似的石料场边坡分级开挖稳定性分析提供参考。

The mining height of Xulong quarry of Xulong Hydropower Station in the Jinsha River is up to 280 m,which is close to the dam and other important hydraulic structures.A finite element model of staged excavation of the quarry slope was established to analyze the deformation and stability characteristics of the high and steep slope under different excavation steps.The results showed that:①In the mining process of Xulong quarry,the large deformation area of the slope gradually changes from the original slope foot to the newly formed slope foot.②With the progress of excavation,bifurcation occured in the large maximum principal strain area of Xulong quarry,and the most unfavorable sliding arc gradually moved from the original slope foot to the newly formed slope foot.③The overall stability of Xulong quarry met the requirements under different excavation steps.The research results can provide a reference for stability analysis of staged excavation of slope for similar rock quarry.