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拉日铁路经过雅鲁藏布江峡谷区,在隧道进出口地段形成许多高陡边坡。盆因拉隧道进口边坡地形陡峻,边坡的工程稳定性直接影响施工安全,需要对边坡的稳定性进行评估。通过对工程地质资料的分析,采用赤平投影法和有限元模拟方法对盆因拉隧道进口边坡稳定性进行评价。赤平投影分析结果表明:边坡处于不稳定状态,需要采取相应的工程防护措施。有限元法结果表明:在开挖加载状态下,潜在剪切破坏点主要集中在隧道开挖处周围和隧道洞口上部边坡坡面以及桥台下部岩体。建议在工程施工开挖时,做相应的工程防护措施。
After passing through the Brahmaputra Gorge area, the Riyadh Railway has formed many high-steep slopes at the entrance and exit of the tunnel. Due to the steep terrain of the inlet slope of Penrain Tunnel, the engineering stability of the slope directly affects the construction safety, and the stability of the slope needs to be evaluated. Through the analysis of engineering geological data, the stability of the inlet slope of Pennala tunnel was evaluated by the method of stereographic projection and finite element simulation. Stereographic projection analysis results show that the slope is in an unstable state and corresponding engineering protection measures need to be taken. The results of finite element method show that under the condition of excavation and loading, the potential shear failure points are mainly concentrated around the tunnel excavation site, the upper slope of the tunnel entrance and the rock mass of the lower abutment. Proposed excavation works, do the appropriate engineering protection measures.