Research on Control of Rock Mass Blasting Forming in Horizontal Layered High-Speed Railway Tunnel
In order to solve the problem of difficulty in forming horizontal layered rock tunnels caused by blasting excavation,based on the construction of the Yijun Tunnel of the Xiyan High-speed Railway under construction,the influencing factors of horizontal layered rock tunnel blasting formation were analyzed,including geological factors,design factors,and construction factors.Optimization measures for blasting parameters were proposed,and the thickness of the smooth blasting layer and the distance parameters between surrounding eyes that affect the blasting formation effect of the tunnel were adjusted.Using the finite element software,a horizontal layered rock tunnel blasting model was established.The optimized blasting scheme was analyzed,and the damage characteristics of the surrounding rock and the effect of over excavation and under excavation in the layered rock tunnel were studied.The results showed that after optimizing the blasting parameters,the maximum amount of over excavation in the tunnel was controlled at 0.2 m,effectively improving the blasting forming effect of the horizontal layered rock mass,enhancing the stability of the layered rock mass,and ensuring the safety of tunnel blasting construction.
horizontal bedded rocksmooth blasting parametersoverbreak and underbreak controlblasting forming
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