跨孔电磁波CT技术在工程精细勘察中的应用

Application of Cross-Hole Electromagnetic Wave CT Technology in Precision Engineering Survey

随着我国基建事业的高速发展和工程建设的全面推进,过去以钻探、常规电法为主的传统勘察手段越来越难以适应日益复杂化、精细化的工程勘察需求,尤其在深埋管道、不规则发育岩溶等典型地质体探测精度较差;而跨孔电磁波CT技术具有分辨率高、反演直观的技术优势,因此本文系统开展了基于精细处理的跨孔电磁波CT(Compated Tomogrophy)技术在3个工程精细勘察中的应用研究。结合钻孔约束和验证情况,分别实现了深埋输油管道精细定位、局部岩溶及裂隙精细识别、大范围岩溶空间分布精细刻画勘察目标,分析认为探测效果较好区域精度可达到1.0 m以内。研究成果一方面验证了跨孔电磁波CT技术在深埋管道、不规则发育岩溶等目标地质体精细勘察的有效性,可为相近工程提供参考价值;另一方面揭示了跨孔电磁波CT技术在未来地下空间和结构体等多领域精细探测中具有广阔应用潜力。

Since the beginning of the 21 st century,along with the rapid development of China’s infrastructure business and the comprehensive advancement of engineering construction,the traditional means of investigation mainly based on drilling and conventional electric method in the past is more and more difficult to meet the increasingly complex and refined engineering investigation needs,especially in the deeply buried pipelines,irregular development of karst,and other typical geologic bodies with poor detection accuracy.And cross-hole electromagnetic wave CT technology has its comparative technical advantages of high resolution and intuitive inversion.Therefore this paper systematically carries out the research on the application of cross-hole electromagnetic wave CT technology based on fine processing in the fine investigation of three projects.Combined with the borehole constraints and verification,the survey objectives of fine positioning of deeply buried oil pipelines,fine identification of local karsts and fissures,and fine delineation of spatial distribution of large-scale karsts are realized.The results show that the accuracy of the areas with better detection effect can reach 1.0m or less.The research results also verify the effectiveness of cross-hole electromagnetic wave CT technology in the fine investigation of deeply buried pipelines,irregularly developed karsts and other target geologic bodies,which can provide reference value for similar projects;on the other hand,it reveals that the cross-hole electromagnetic wave CT technology may have a broad potential for application in the future of the underground space and structures and other fields of fine detection.