顺层岩质路堑边坡的光面爆破技术

Smooth Blasting Technique of Cutting Slope in Layered Rock Mass

将光面爆破原理应用于渝怀铁路顺层岩质路堑工程,提出了顺倾边坡一侧采用预留保护层的浅孔光面爆破及反倾一侧采用预留保护层深孔光面爆破的施工方案。通过选取合理的爆破参数,使光面爆破产生的质点振动速度仅为相应常规爆破的25%～50%,既使坡面平顺、光滑,又保证了顺层边坡岩体的稳定。

Applying the principle of smooth blasting to the cutting engineering of layered rock mass in Yuhuai railway, the implementation schemes that the short-hole smooth blasting is used to excavate the projection layer in the side of down-layered slope and that the deep-hole smooth blasting is used in the side of up-layered slope are put forward in this paper. The vibration velocity of particles resulting from smooth blasting is only equal to 25%～50% of conventional blasting through selecting the reasonable blasting parameters. The controlled blasting not only makes the slope surface level and smooth, but also assures the stability of layered rock slope.