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| 基金项目：国家自然科学青年基金项目“基于区域分解的大地电磁三维快速正反演研究”（41404057） |
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| 摘要： |
| 大长深埋隧道是基础设施建设中的勘察难点，地质调查和钻探难以满足勘察精细化需要。大地电磁测深广泛应用于地热及矿产勘查，但在公路大长深埋隧道勘察中应用较少。将大地电磁测深与高密度电法结合，可降低成本并避免钻孔的“一孔之见”。大地电磁测深经静态校正和反演，可获得隧道轴线的卡尼亚视电阻率剖面图，结合钻孔资料可绘制地质剖面图。在福建永泰三环路公路勘察中，两种方法的应用（尤其是大地电磁测深）取得了丰富的成果，结合钻孔验证，明确了地层界限、断层破碎带及岩性接触带位置，为隧道围岩分级和工程地质条件评价提供了依据。 |
| 关键词：大长深埋隧道 工程勘察 大地电磁测深 高密度电法 福建永泰 |
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| Abstract: |
| Large deep long tunnels pose significant challenges in the geological investigation of infrastructure construction. Relying solely on geological surveys and drilling is insufficient to meet the requirements of refined investigation. Although magnetotelluric sounding (MT) is widely used in geothermal and mineral exploration, its application in the investigation of large deep long highway tunnels remains limited. The combination of magnetotelluric sounding and high-density electrical method can reduce costs and avoid the ″one-sided perspective″ of boreholes. After static correction and inversion of the magnetotelluric sounding data, the Kaniam apparent resistivity profile along the tunnel axis can be obtained. By integrating this profile with borehole data, a geological section map can be generated. In the highway investigation of the Third Ring Road in Yongtai, Fujian Province, the application of these two methods (particularly magnetotelluric sounding) yielded substantial results. Combined with borehole verification, the stratigraphic boundaries, fault fracture zones and lithological contact zones were clearly identified, providing a basis for the classification of tunnel surrounding rock and the evaluation of engineering geological conditions. |
| Keywords:large deep long tunnel engineering investigation magnetotelluric sounding high-density electrical method Yongtai in Fujian Province |
| 刘彦华,吴晨晨.综合地球物理方法在大长深埋隧道勘察中的应用[J].地质学刊,2025,49(4):451-456 |
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