【摘要】 雁门关隧道位于走滑构造控制的恒山变质岩地区,在施工过程中经常遇到大变形、突泥等问题。通过对该隧道施工灾害典型段(DK118+30.0～DK118+200.0段)的走滑偏压特征分析、偏压数值模拟以及应力和变形收敛监测等发现:(1)研究段穿越小尺度的走滑断层;(2)围岩级别差异是深埋隧道偏压的主导因素,偏压对围岩的下沉收敛影响显著甚至起控制作用;(3)隧道大变形突泥段的围岩破坏机制是层间剪切和挤压破碎。研究认为,在构造复杂的变质岩地区进行隧道等地下工程设计施工时,要充分考虑围岩所受应力情况和岩性差异等因素,灵活变更施工技术。更多还原

【Abstract】 Yanmenguan tunnel is located in the Hengshan metamorphic area,which is controlled by strike-slip structures.During construction,large deformation and sudden mud bursting often happened,especial in the section of DK118+30.0–DK118+200.0.Based on analyses and numerical simulations of bias pressure feature of strike-slip faults,and monitoring of stress and deformation,it is found that:(1) The section of DK118+30.0– DK118+200.0 is controlled by the strike-slip structures.(2) The dominant factor for bias pressure of deep tunnel is the difference of surrounding rock class,and the bias pressure affects the subsidence of surrounding rocks obviously.(3) The failure mechanism of surrounding rocks of Yanmenguan tunnel is interlayer shear and compression.It is suggested that the stress of surrounding rocks and the difference in rock properties should be considered during design and construction of tunnels in metamorphic area,and construction technologies should be accordingly changed.更多还原