水电站料场开口线外边坡开挖稳定性分析

Stability Analysis on the Excavation of the Material Yard Slope outside the Opening Line of Hydropower Station

针对料场开挖会对开口线外自然边坡产生影响,甚至会引起滑坡等自然灾害造成质量安全事故的情况。笔者依托于西南某一大型水电工程,通过数值模拟与现场实测监测数据对比,研究料场开挖过程不同阶段,料场上部一高陡岩质边坡的稳定性与变形以及开口线外的陡崖变形情况。研究表明:利用UDEC中的节理模型分析多结构面类型的岩质边坡的稳定性,较传统方法更为简便且模拟值与监控值基本一致,能可靠的模拟边坡变形;多节理质高陡边坡的加固方案,开挖削坡效果较好,在开挖难度较大时再考虑支护设计;料场开挖工程中,开口线外的陡崖发生了变形破坏,需要相应的支护设计。

The excavation of material yard will affect the natural slope outside the opening line,and even cause landslides and other natural disasters,resulting in quality and safety accidents.Based on a large hydropower project in southwest China,the different stages of excavation process of material yard,the stability and deformation of a high and steep rock slope and the deformation of the cliff outside the opening line were studied by comparing the numerical simulation with the field monitoring data.The research shows that the joint model in UDEC is more convenient than the traditional method to analyze the stability of rock slope with multi-structural planes,and the simulation values are basically consistent with the monitoring values,which can reliably simulate the deformation of the slope.The reinforcement scheme of multi-joint high-steep slope has better effect of excavation and cutting,and when the excavation is more difficult,the supporting design should be considered.In the excavation project of material yard,the steep cliff outside the opening line has been deformed and destroyed,and the corresponding supporting design is needed.