活断层错动位移下变形缝间距对隧道内力的影响

Influence of Deformation Joint Spacing on Internal Force of Tunnel under Active Fault Movement

以活动断裂带为工程背景,探究变形缝间距对跨断层隧道内力的影响。运用ABAQUS有限元分析软件,建立穿越活动断裂带的隧道模型,分析断层错动下不同节段长度隧道围岩压力分布情况、二次衬砌最大轴向应力变化情况以及隧道塑性应变发展规律。结果表明:隧道节段长度越短,二次衬砌最大轴向应力越小,最大塑性应变越大;断层错动的影响主要集中在断层带内左侧区域的隧道,拱腰和拱脚部位受力和塑性变形明显。

In this paper, we focus on the influence of different deformation joint spacings on tunnels under the condition of fault movement. We establish a model of fault-crossing tunnel by means of finite element software ABAQUS. We ana- lyze the surrounding rock pressure, the maximum axial stress and the development of plastic strain of the tunnel with dif- ferent deformation joint spacings. The results show that the more the deformation joints, the smaller the maximum axial stress is and the larger the maximum plastic strain is; The influence of the fault movement mainly focuses on the tunnel in the left area of the fault zone, and the stress and plastic strain at the arch waist and spring line of the tunnel are dis- tinctive.