综合物探技术在断裂勘察中的应用与研究  

Application and Research of Comprehensive Geophysical Prospecting Technology in Active Fault Exploration

作　　者：季凇达 Ji Songda(China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]中国铁路设计集团有限公司,天津300251

出　　处：《工程地球物理学报》2021年第5期716-723,共8页Chinese Journal of Engineering Geophysics

基　　金：中国国家铁路集团有限公司资助项目(编号:K2019G031);中国铁路设计集团有限公司资助项目(编号:2019YY120101)。

摘　　要：断裂勘察一直是铁路勘察的重点和难点。物探技术是断裂勘察的主要手段,对于复杂的断裂,单一的物探方法难以确定其准确位置和破碎带范围,为提高复杂断裂的勘察精度,可采用多种物探方法结合的综合物探技术。本文以山西某铁路的断裂勘察为例,应用天然源大地电磁法、直流电测深法和电阻率联剖法结合的综合物探技术,对该断裂进行精细化勘察,并对结果进行分析。结合多种物探方法综合推断,准确查明了断裂的中心位置,划分出了断裂破碎带的影响范围。最后通过钻孔验证,表明综合物探技术在推断断裂位置、划分破碎带范围方面具有准确性和高效性,为铁路的线路规划和规避风险提供了准确支撑。Active fault,exploration is the focus and difficult point of railway exploration.Geophysical prospecting technology is the main means of active fault structure investigation.For complex active faults,it is difficult to determine the accurate location and fracture zone range by single geophysical prospecting method.In order to improve the exploration accuracy of complex active faults,comprehensive geophysical prospecting technology combining multiple geophysical prospecting methods can be used.In this paper,taking the active fault exploration of a railway in Shanxi province as an example,the natural source magnetotelluric method,direct current sounding method and resistivity joint section method are combined to carry out fine exploration of the active faults.Through the comparison and verification of a variety of geophysical methods,the center position of the faults can be accurately identified,and the influence range of the fault fracture zone can be accurately isoluted.Finally,the borehole verification shows that the comprehensive geophysical technology is accurate and efficient in inferring the fault location and dividing the fracture zone,which provides accurate support for the railway line planning and risk aversion.

关 键 词：综合物探 天然源大地电磁法 直流电测深法 电阻率联剖法 断裂勘察 

分 类 号：P631.3[天文地球—地质矿产勘探]