In this paper, the Zhashanzui Tunnel project on G309 road Guyuan-Xiji Sector is adopted as background, integrated with its actual geological conditions, this paper uses large scale finite element software MIDAS-GTS to set up an uphill slope tunnel sector excavation model. The modified strength reduction method based on the generalized Hoek-Brown theory is used to calculate the displacements of rock and soil at the upper part of the tunnel during the tunnel excavation. Results show: The vertical settlement of the rock mass near the entrance of the tunnel is the most obvious due to excavation, and it is likely to be destabilized under certain conditions.%以G309线固原至西吉公路炸山嘴隧道工程为依托,结合其实际地质条件,采用大型有限元软件MIDAS-GTS建立仰坡隧道分部开挖模型.采用改进的基于广义Hoek-Brown理论的强度折减法对隧道开挖过程中各阶段隧道上部岩土体的位移进行计算分析,结果表明:隧道入口处仰坡附近岩土体由于受开挖影响,其竖向沉降最为明显,一定条件下有可能发生失稳破坏.
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