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金川水电站导流洞进口边坡开挖过程较为复杂,坡体开挖部分岩性较差且有多组结构面发育,部分区域为强风化强卸荷岩体,为保障边坡安全稳定、节约边坡治理成本需合理优化锚固措施。为此,结合极限平衡法、二维和三维有限元法,从位移、应力、塑性区和稳定性多角度对初拟锚固方案的支护方式、锁口锚索与锚筋桩的设置、预应力锚索数量进行优化分析。结果表明,初拟方案下开挖边坡的各项安全指标均在合理范围内,其锚固措施是可行有效的。
Jinchuan Hydropower Station Diversion Tunnel entrance slope excavation process is more complicated, part of the slope rock excavation is poor lithology and multiple sets of structural surface development, part of the strong weathered strong unloading rock mass, in order to ensure the safety and stability of the slope, saving Slope treatment costs should be reasonable to optimize the anchoring measures. Therefore, combined with limit equilibrium method, two-dimensional and three-dimensional finite element method, from the multi-angle of displacement, stress, plastic zone and stability, The number of stress and anchor cables is optimized. The results show that all the safety indexes of excavated slope under the first proposed scheme are within a reasonable range, and the anchoring measures are feasible and effective.