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雷公尖隧道全长3080m,是双线铁路隧道。隧道进口地质情况是灰黑色厚层夹中厚层隐晶质灰岩,围岩Ⅳ～Ⅴ类,岩层产状N28°W/89°,走向与线路近似正交,岩层层理近似垂直。开挖后,发现有多处溶洞,从DK1984+226.5开始,从隧道底部到拱顶上部出现约1.0m～2.0m宽溶洞,上大下小,其填充物为沙夹粘土和岩屑。隧道进口由二处一队担任施工任务。为解决大瑶山隧道全断面深孔光面爆破技术,掌握予裂爆破和一般光
Lei Gongjian tunnel length of 3080m, is a two-lane railway tunnel. The geological conditions of the tunnel entrance are thick black-gray thick clastic cryptocrystalline limestone and the surrounding rocks are Ⅳ ~ Ⅴ type with N28 ° W / 89 ° formation. The strike direction is approximately perpendicular to the line, and the strata are approximately vertical. After excavation, a number of caves were found. Starting from DK1984 + 226.5, ca. 1.0m ~ 2.0m wide caves appeared from the bottom of the tunnel to the top of the vault. Tunnel imports from a team served as construction tasks. In order to solve the Dayuoshan tunnel full-face deep-hole smooth blasting technology, to master the pre-split blasting and general light