Based on the smooth blasting field test,the influence of the bedding structure on the smooth blasting was analyzed,and the technical parameters suited in the layered slate tunnel were sum-marized.Tracking measurements of over-break and under-break excavation before and after optimization of the smooth blasting test were carried out for a few representative tunnel sections,and the effect of smooth blasting was analyzed comparatively.The results indicated that the averaged semi-eye preservation rate is 85% ~90%,the mean linear over-break value is less than 10cm,and the maximum linear over-break value is about 18 ~20 cm in some partial zone.Technology based on optical burst is promoted to the slate tunnels in the highway from Huaihua to Tongdao.Technical and economic effects after applica-tion of smooth blasting are summed up.The implementation about smooth blasting can provide a reference for similar projects.%在开展光面爆破现场试验基础上，分析了层理构造对光爆效果的影响，总结了适用于层状板岩隧道的光爆技术参数，对试验段光爆优化前后代表性隧道断面超欠挖进行跟踪量测，对比分析光面爆破效果，实现了半眼保存率平均达到85％～90％以上，平均线性超挖量小于10 cm，局部最大线性超挖量18～20 cm。基于光爆技术在怀通高速公路全线层状板岩隧道施工中的推广应用，总结了光面爆破实施后的技术经济效果，可为类似工程提供参考。
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