基于不同上覆岩层的浅埋隧道动力响应特性研究

利用Midas NX有限元数值模拟软件对浅埋隧道数值模型进行非线性时程分析,研究了在不同上覆岩层的情况下,岩层类型和地震波激振峰值对浅埋隧道加速度动力响应的影响。结果表明:在Ⅰ~Ⅴ类上覆岩层状况下,衬砌上各测点的放大系数大于1;不同上覆岩层对衬砌加速度动力响应均有放大效应;围岩条件越好,隧道抗震性能越强。在Ⅰ~Ⅲ类上覆岩层条件下,地震波激振峰值对隧道动力响应的影响比在Ⅳ及Ⅴ类上覆岩层条件下要大。

Dynamic response characteristics study of shallow buried tunnel based on different overlying rock

The Midas NX finite element numerical simulation software is used to simulate the nonlinear time history analysis of numerical model of shallow buried tunnel. Under the condition of different overlying rock, the influence of type of overlying rock and peak value of seismic wave on acceleration response of shallow buried tunnel is studied. Results show that under the condition of Ⅰ to Ⅴ range of overlying rock, the acceleration amplification factor of lining is larger than the 1. The acceleration dynamic response of the lining is enlarged with different overlying rock. The better the condition of surrounding rock, the better the seismic performance of the tunnel. Under the condition of Ⅰto Ⅲ range of overlying rock, influence of excitation peak on dynamic response of the tunnel is larger than the condition of Ⅳ and Ⅴ range of overlying rock.