偏压隧道的稳定性研究

Study on the stability of biased tunnel at topographical uneven pressure

摘要:

地表倾角不同是隧道形成偏压的一种原因。由于地表不对称，隧道两侧受力状况不同，从而容易对隧道衬砌产生破坏。采用有限元分析方法研究了不同地表倾角、隧道周围变形过程及隧道锚杆和塑性区分布特征，得出了以下结论：隧道围岩变形随着地表倾角增大而增大，隧道深埋侧变形大和锚杆轴力大；隧道在地表倾角＞30°时，受地形偏压影响明显，深埋侧塑性区扩大。这些研究可为受地形偏压的隧道设计提供一定的理论依据及施工建议。

Abstract:

The different surface dig angle is one of the reasons for the biased tunnel. Due to the surface asymmetry, the force on the two sides of the tunnel is different from each other, leading to damage to the lining of the tunnel. The finite element analysis was used to study different surface dig angles, the deformation process around the tunnel and the distribution characteristics of tunnel bolts and the plastic zone. When the surface dig angle is greater than 30°, the tunnel is clearly affected by biased pressures and the plastic zone on the deeper side is enlarged, which can provide some theoretical basis and construction suggestions for the tunnel design under the topographic biased pressure.