In this study, we have a research of the influence mechanism of lamella joints on tunnel blasting effect. During the process of the tunnel blasting construction, primary structural planes make an important role for the effect of smooth blasting. Especially, it is difficult to attain the perfect blasting effect when the lamella joints intersect with the designed contour line. Coupled effect of the explosive stress waves and the explosive gas is deemed to the basic theory, analysis the blasting effect in the condition of single closed joint and lamella joints intersect with the designed contour line and test it combined with the tunnel engineering. Research results show that back break will occur at the same time in the condition of single closed joint, on the other hand, hackly back break will occur in the condition of the lamella joints.
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