在侧爆作用下既有山岭隧道支护结构动态响应分析

Dynamic response of existing mountain tunnel support structure under side explosion

基于现场监测数据,采用数值分析方法研究了在侧爆作用下拱桥铺山岭隧道衬砌弯矩和锚杆轴力的动态响应规律。随着应力波的传播,衬砌最大正负弯矩先增加后减小,右衬砌拱脚一直受到较大负弯矩作用,衬砌受到正弯矩较大位置在右侧拱腰至拱脚之间。在右侧动载的作用下,无衬砌影响时,锚杆受到的拉力明显增加,并且每根锚杆轴力从锚头至锚尾先增加后减小;受衬砌的影响时,锚杆受到的拉力明显减弱,受到的压力有所增强。

Based on the on-site monitoring data, the bending moment of lining and the axial force of bolts of Gongqiaopu tunnel under side explosion are studied by numerical analysis. With the propagation of stress waves, the maximum positive bending moments and negative bending moments of the lining increase first and then decrease, and the right lining arch foot is always subjected to a large negative bending moment. The lining subjects to a large bending moment between the right side of the arch waist and the arch foot. Under the action of the right-side dynamic load, the tensile force of the bolts obviously increases when there is no lining effect, and the axial force of each bolt increases first and then decrease from the anchor head to the anchor tail. When the bolt is affected by the lining, the tensile force is obviously weakened, and the pressure increases.