水平层状岩体隧道爆破开挖数值模拟及振动效应研究

Numerical Simulation and Vibration Effect on Horizontal Layered Rock Mass Blasting Excavation

以蒙华铁路喜家岭隧道爆破施工为研究背景,采用动力有限元法探索层状岩体的存在对隧道爆破形成的应力场与振动场的影响。本文建立了均质岩体和水平两层岩体两个有限元模型。在保证模型尺寸、模拟参数以及网格划分完全相同的情况下,通过改变岩石材料参数与爆破微差间隔时间,在隧道拱顶、拱腰、拱脚处提取振速与应力数据,比较两种模型的振速与应力的衰减规律。指出层状岩体的存在会使应力波的传播发生改变,并分析了微差间隔时间的不同对爆破造成的影响。

Xijialing tunnel blasting construction of Menghua railway is taken as the research background, and dynamic finite element method is used to explore the effect of layered rock mass to the tunnel explosion forming the stress field and vibration field. Two models are done, one is homogeneous model, the other is rock mass with two layers. When both model dimension, simulation parameter and mesh generation are same, different rock material parameters and millisecond blasting time interval are considered, velocity and stress data at vault, hance and skewback are picked up, and the attenuation law of velocity and stress are compared with. The results show that the layered rock changed the stress wave propagation law and analysis the effective of different millisecond blasting time interval.