摘要
为了解决在山区难以开展地质调查、钻探及物探工作的问题,提出在特定岩性区域开展高精度航空磁法勘察工作,利用其快速高效、飞行条件要求低、探测深度大的技术优势,对铁路隧道沿线地质情况进行探测。在某山区铁路勘测中,高精度航空磁测线布置采用1∶5000比例,纵向测线间距为50 m。数据处理与解释时,将ΔT化极等值线结果、2.5D反演结果与区域物性资料相结合,对隧址区断裂带、裂隙发育带以及岩性进行划分,同时对其深部埋深情况进行推断。研究结果表明,高精度航空磁法的勘察结果与地面大地电磁法及钻探相符,其中,与钻孔揭露岩性一致率58%,钻孔揭露断层准确性100%。本次提出的高精度航空磁法适用于山区特定岩性区域工程地质勘察,可为工程设计、施工提供所需要的地质构造、地层岩性等关键信息。
In order to solve the problem of difficult geological survey,drilling,and geophysical exploration work for railway tunnels in mountainous areas,the high-precision airborne magnetic survey work was carried out in specific lithological areas.By utilizing its technical advantages of fast and efficient speed,low flight conditions requirements,and large detection depth,the geological conditions along the railway tunnel were detected.In a railway survey in a certain mountainous area,high-precision airborne magnetic survey lines were arranged in a 1∶5000 scale,with a longitudinal survey line spacing of 50m.When processing and interpreting data by combining the results ofΔT-shaped contour lines,2.5D inversion,and regional physical property data,the fault zone,fracture development zone,and lithology in the tunnel site area were divided,and the deep burial depth was inferred.The research results indicate that the survey results of high-precision airborne magnetic method are consistent with the ground magnetotelluric method and drilling,with a consistency rate of 58%for the lithology revealed by the drilling,and a 100%accuracy of the fault revealed by the drilling.The high-precision airborne magnetic method proposed in this study is suitable for engineering geological exploration in specific lithological areas in mountainous areas,and can provide information such as geological structure and stratigraphic lithology for engineering design and construction.
作者
李海
李鹏博
LI Hai;LI Pengbo(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)
出处
《铁道勘察》
2023年第6期70-75,112,共7页
Railway Investigation and Surveying
关键词
山区铁路
隧道勘察
高精度航空磁法
测线布置
mountainous railway
tunnel survey
high-precision airborne magnetic method
survey
作者简介
李海(1968-),男,1991年毕业于河北地质学院铁路工程地质与工程物探专业,工学学土,高级工程师,E-mail:516552569@qq.com。
