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隧道洞口段开挖对洞口段边坡的稳定性影响很大,采用FLAC3D对隧道开挖时洞口边坡的变形进行数值模拟分析。隧道开挖后对地表沉降影响较大范围为隧道拱顶外侧1倍洞径范围内,而在3倍洞径范围外几乎没有影响。在纵向方向,越接近隧道洞口其地表沉降越大。后开挖隧道对先开挖隧道上方地表沉降有较大影响。隧道开挖对隧道拱顶上方边坡影响最大,距离越远其影响越小。其影响以拱顶为中心对称分布。
The excavation of the tunnel entrance has a great influence on the stability of the slope in the tunnel entrance section. The numerical simulation of the deformation of the tunnel entrance is carried out by FLAC3D. After excavation, the influence of surface excavation on the settlement is larger than 1 times the diameter of the outer side of the tunnel dome, while it has little effect outside the 3 times diameter. In the longitudinal direction, the closer the ground to the tunnel entrance, the greater its settlement. Post-excavation of the tunnel excavation of the tunnel above the ground settlement has a greater impact. Tunnel excavation has the greatest impact on the slope above the tunnel vault. Its influence is symmetrical around the dome.