摘要
某铁路隧道隧址区分布有小煤窑采空区。为查明采空区的分布,通过实地调查地表变形、收集矿区煤层资料等手段,大致确定了采空区的范围和深度;采用高密度电法沿隧道布置纵向和横向测线,进一步确定了采空区的分布,最后通过在隧道两侧布置钻探进行了验证。研究结果表明,采空区分布于隧道拱顶上方2～4 m。由于线位平面绕避非常困难,通过降低线位高程12 m,使得隧道从采空区下方通过。施工中可通过加强超前支护,采用复合式加强衬砌,增加防排水设备、有害气体检测等措施进行处理。
A small coal mine goaf is distributed in a railway tunnel site. In order to find out the distribution of the goaf, the scope and depth of the goaf are roughly determined by means of field investigation of surface deformation and collection of coal seam data. The distribution of the goaf is further determined by the highdensity electrical method which is used to arrange longitudinal and lateral survey lines along the tunnel, and finally verified by drilling on both sides of the tunnel. The research results show that the goaf is distributed 2 to 4 m above the tunnel vault. Since the planar line avoidance is very difficult, the tunnel passes through below the gob area by reducing the line position elevation by 12 m. During construction, it can be conducted by measurements such as strengthening advanced support, using composite reinforcement lining, adding waterproof and drainage equipment and harmful gas detection.
作者
黄创
Huang Chuang(Railway Engineering Consulting Group Co. ,Ltd. Taiyuan Design Institute, Taiyuan 030013, China)
出处
《铁道勘察》
2019年第2期47-50,共4页
Railway Investigation and Surveying
关键词
隧道
小煤窑采空区
勘察
立体绕避
Tunnel
Small coal mine goaf
Survey
Stereoscopic avoidance
