关键词: 隧道, 古煤窑, 煤层, 采空区, 瓦斯, 安全, 施工技术

Abstract:

 Taking the construction of New Dabashan tunnel on No. 2 line of AnkangChongqing section of XiangfanChongqing railway as an example, the author summarizes the construction technology for safe and rapid tunneling through coal/gas area and ancient coal mine goaf in this paper. On basis of design of reasonable construction scheme, countermeasures, such as advance geology forecasting, ventilation, gas monitoring, advance reinforcement, surrounding rock grouting and coal mining, are taken, which ensures the safe tunneling through coal/gas area and ancient coal mine goaf. The paper can provide reference for similar projects in the future.

Key words: tunnel, ancient coal mine, coal seam, goaf, gas, safety, construction technology