砂土条件下加固隧道掌子面稳定性研究

针对玉磨铁路的太达村隧道工程,结合普氏压力拱理论并参照三维旋转破坏机制,提出考虑土供效应条件下改进的三维旋转破坏模型对砂土条件下隧道掌子面稳定性进行研究.所提出的破坏模型可分为2部分:1)位于交叉层的旋转破坏部分;2)位于覆盖层的拱形破坏部分.基于本文所提出的改进破坏模型,采用岩土-锚杆模型对加固隧道掌子面稳定性进行研...

Assessment of the reinforced tunnel face stability in sand soils

For the Taidacun tunnel of Yumo railway,combined with theory of Proctodyakonov’s pressure arch and the three-dimensional rotational failure mechanism,an improved three-dimensional rotational failure model with considering soil arching effect was proposed to investigate the tunnel face stability in sand soils.The proposed failure mechanism could be divided into two parts:(1)the rotational failure part in the crossed layer;(2)the arching failure part in the cover layer.Based on the proposed failure mechanism,the soil-anchor model was used to study the stability of reinforced tunnel faces.The results show that:(1)compared with the existing research results,the proposed method is reliable and more suitable for the stability analysis of tunnel faces in sand soils;(2)Combined with the practical tunnel engineering,it can be seen that the method proposed in this study can effectively guide the design and construction of tunnel face reinforcement in sandy soils.