锦屏水电站缆机平台高陡边坡开挖支护数值模拟

以锦屏水电站缆机平台高陡边坡为例,采用有限元法对其分级开挖支护过程进行数值模拟计算,分析不同的单级开挖高度、岩体强度参数和支护时间对高陡边坡变形和稳定性的影响。结果表明边坡的变形、安全系数受岩体强度参数影响较大;较好岩体条件下,单级开挖高度和支护时间对边坡的变形、安全系数影响很小,较差岩体条件下,单级开挖高度和支护时间对边坡的变形、安全系数影响显著,且单级开挖高度越大,支护的作用效果越明显。研究成果可为实际高陡岩石边坡工程开挖支护方案优化和施工提供参考。

Numerical Simulation on the Excavation and Support of High and Steep Slope of Cable-crane Platform of Jinping Hydropower Station

The process of stepped excavation and support of the high-steep slope of cable-crane platform of Jinping hydropower station was simulated using finite element method.The effects of single-stage excavation height, strength parameters of rock mass,and supporting time on the deformation and stability of the slope were analysed. Results indicate that the deformation and safety factor are greatly influenced by the strength parameters of rock mass;when the rock mass is of good conditions,the height of single-stage excavation and the supporting time have small impacts on the deformation and safety factor,but when in poor conditions,the effects are significant,and lar-ger height of single-stage excavation will lead to more obvious support effect.The research results provide reference for the optimization and construction of excavation and supporting scheme of high and steep slope engineering.