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以锦屏二级水电站1#引水隧洞强岩爆洞段为例,运用RFPA对隧洞上半断面开挖进行数值分析,通过对隧洞破坏模式及其围岩的应力分析,在强岩爆洞段上半断面开挖过程中,围岩首先在边墙附近出现破坏,然后不断向拱肩方向扩展,即应力首先在洞壁附近产生应力集中,导致围岩产生损伤,随着损伤范围的扩大,高应力场向远离洞壁的方向发展,同时洞壁附近的应力逐渐变小,其中边墙处围岩变化最为明显,这与现场实际情况基本吻合。
Taking the strong rock burst section of 1 # diversion tunnel in Jinping second stage hydropower station as an example, the numerical analysis of the excavation of the upper half section of the tunnel is carried out by RFPA. By analyzing the failure mode of the tunnel and the stress analysis of the surrounding rock, During the excavation of the upper half section, the surrounding rock first breaks down near the side wall and then continuously expands toward the arch shoulder. That is to say, the stress first generates stress concentration near the wall, resulting in the damage of the surrounding rock. As the damage area expands, The high stress field develops away from the wall and the stress near the wall gradually becomes smaller. The wall rock changes most obviously at the wall, which is in good agreement with the actual situation in the field.