锚固硐室在顶爆作用下加固效果及机理数值模拟

Numerical simulation of anchored effects and anchored mechanism of tunnels reinforced by bolts under top explosion

针对硐室经常会受到各种动载作用问题.采用动态数值模拟软件,研究了锚固硐室在顶爆作用下的抗爆加固效果,并对加固机理进行了分析.通过对比拱顶同一位置的试验和数值模拟压应力时程曲线,说明数值模拟结果比较可靠.对比毛硐和锚固硐室的拱顶位移,发现经过锚杆加固硐室拱顶位移有明显的减少.通过对比毛硐和锚固硐室裂纹分布,得到毛硐的裂纹明显比锚固硐室分布广、宽,说明锚杆的抗爆效果比较好.根据锚杆锚头位置轴应力时程曲线,可以知道锚杆支护能够起到抗爆加固效果.

According to tunnels under all kinds of dynamic loads,the anti-explosion effects and anchored mechanism of tunnels reinforced by bolts were studied by using numerical analysis.Comparing with compression-stress curve of the experiments and numerical simulation on the same location of the vault,the simulation results are relatively reliable.By contrast the vault displacement of anchored tunnel and unlined tunnel,the vault displacement of the tunnel is significantly reduced through the reinforcement with anchor bolts.By comparing the crack distribution of the anchor tunnel and unlined tunnel,the cracks of unlined tunnel are significantly thicker and wider than that of the anchored tunnel,which indicates that the anti-explosion effects of anchor rods are better.The anchored bolts supporting can take effect of reinforcement and anti-explosion according to the time-histories curve of the anchor-head.