地空时频域电磁法对隧道岩溶的探测分析

Detection and analysis of tunnel karst by ground-airborne time-frequency electromagnetic method

随着我国西南交通建设的快速推进,为保障隧道建设期安全,针对隧道不良地质的勘察意义重大,而地面勘察技术手段受地形等影响,工作效率低,局部区域难以开展。鉴于此,针对云南省某公路隧道开展了水文地质调查、地球物理特征统计及地空时频域电磁探测,查明了隧道沿线的不良地质段、设计轴线周围的岩溶或富水区的空间分布形态,为隧道施工安全与整治提供了依据。该方法的成功应用,可为国内碳酸盐岩地区的隧道岩溶勘察提供一种可借鉴的技术手段,同时可推广到工程建设与矿产勘查等领域,预期可取得较好的应用效果。

With the rapid development of transportation construction in southwest China, in order to ensure the tunnel construction safety, it is significant to investigate the adverse geology of the tunnel. However, ground survey is affected by the topography, and the work efficiency is low, and it is sometimes difficult to carry out in some areas. Hydrogeological survey, geophysical characteristics statistics and ground-airborne time-frequency electromagnetic detection was carried out along the highway tunnel in Yunnan Province to investigate the adverse geological sections, and the spatial distribution patterns of karst or water-rich areas around the tunnel design axis, which provided a basis for the tunnel construction safety. The successful application of this method could provide a referable technical means for tunnel karst exploration in carbonate rock areas in China and could be extended to engineering construction and mineral exploration.