地空时频域电磁法在云南某隧道勘察中的应用研究

中国西南交通建设快速推进，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，为隧道施工安全整治提供依据。该方法的成功应用，较地面瞬变电磁法相比，工作效率提高了10倍以上，可为国内碳酸盐岩地区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、矿产勘查等领域，预期可取得较好的推广应用效果。

Study on the Application of Ground-space Time-frequency Electromagnetic Method in a Tunnel Investigation in Yunnan Province

With the rapid development of transportation construction in southwest China, in order to ensure the safety of tunnel construction period, it is of great significance to investigate the unfavorable geology of tunnel. However, the ground survey technology is affected by topography, the work efficiency is low, and it is difficult to carry out in local areas. In view of the above, a highway tunnel in Yunnan province was investigated by hydrogeological survey, geophysical characteristics statistics and ground-airborne time-frequency electromagnetic detection, and the spatial distribution patterns of unfavorable geological sections along the tunnel and karst or water-rich areas around the design axis were identified, which provided a basis for the safety regulation of tunnel construction. The successful application of this method can provide a referable technical means for tunnel karst exploration in carbonate rock areas in China, compared with ground TEM, the working efficiency is increased by more than 10 times, and can be extended to engineering construction and mineral exploration, and better application results are expected.