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以某水电站地下厂房工程为实例,采用数值分析方法,通过对比厂房洞室群是否施加系统锚杆的差别,获得系统锚杆对洞室群稳定性的影响。结果表明,施加系统锚杆对围岩主应力影响小,但能平均降低围岩位移28.07%,降低拱顶和拱角处围岩位移34%以上,降低主厂房和尾闸室边墙塑性破坏区深度2.2～4.8m,在一定程度上提高洞室群的整体稳定性。
Taking the underground powerhouse project of a hydropower station as an example, the influence of the system bolt on the stability of the cavern group is obtained by comparing with the difference of the system bolts by comparing the cavern group in the plant with the numerical analysis method. The results show that the system anchor has little effect on the main stress of surrounding rock, but can reduce the displacement of surrounding rock by 28.07% on average and reduce the displacement of surrounding rock at the vault and arch angle by more than 34% Depth 2.2 ~ 4.8m, to a certain extent, improve the overall stability of cavern group.