Tunnel excavation by blasting can be directly influenced by karst cavities when tunnelling through the karst strata with blasting method,which brings a lot of damages such as landslide and casualties.

• 在岩溶地区采用钻爆法进行隧道开挖施工；溶洞的存在对隧道爆破开挖安全有直接影响；严重者会造成塌方、伤亡等重大事故.