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在有限元程序的基础上,建立了边坡隧道平面应变数值模型,对比分析了隧道不同开挖位置对边坡稳定性的影响。研究表明:隧道在边坡上部开挖,其扰动对隧道本身以及边坡影响不大,当隧道开挖至边坡中部,边坡出现明显位移变化。随着隧道开挖位置向坡底移动,对边坡以及隧道周边土体迅速产生较大扰动,甚至产生破坏。由此,确定隧道开挖位置的合理范围,为此类隧道建设提供了定性或定量分析结果,使实际工程设计更加合理。
Based on the finite element program, a numerical model of the plane strain of the slope is established, and the influence of different excavation positions on the stability of the slope is analyzed. The results show that the excavation of the tunnel in the upper part of the slope has little effect on the tunnel itself and the slope. When the tunnel is excavated to the middle part of the slope, the displacement of the slope changes obviously. As the excavation site of the tunnel moves to the bottom of the slope, the soil around the slope and the tunnel will rapidly generate large disturbance and even destroy. Therefore, the reasonable range of tunnel excavation location is determined, which provides qualitative or quantitative analysis results for such tunnel construction, so that the actual engineering design is more reasonable.