OCTEM在铁路工程前期勘察中的应用

Application of OCTEM in Railway Engineering Preliminary Investigation

在铁路工程前期勘察工作中,岩溶、采空区和断层破碎带等不良地质体严重影响线路走向,应采用合适的物探手段查明上述不良地质体分布,为线路比选提供依据,而目前常规的物探手段普遍存在分辨率较低、对地形条件要求高和探测深度有限等缺点。OCTEM是近几年来发展起来的一种新型物探手段,具有浅层分辨率高、对各类复杂施工条件适应能力强且探测深度大等优势。为解决某铁路工程中岩溶、采空区和断层破碎带等不良地质体勘察难题,采用OCTEM开展了勘察工作,首先总结该方法在勘察工作中参数选择规律和注意事项,然后将得到的探测结果与已有的地质资料进行对比分析,较为准确地圈定了3处溶洞和3处采空区的范围,以及1处断层破碎带位置。

In the preliminary survey of railway engineering,bad geological bodies such as karst,mine gob and fractured zones have a serious influence on the direction of railway line.The use of appropriate geophysical exploration methods to identify the above-mentioned bad geological bodies will provide a certain basis for comparison and selection of railway line.At present,conventional geophysical methods generally have shortcomings such as low resolution,high requirements for terrain conditions and limited detection depth.OCTEM is a new engineering geophysical exploration method developed in recent years.This method has the advantages of high shallow resolution,strong adaptability to various complex construction conditions,and a maximum detection depth of about 300 m.In order to solve the problem of unfavorable geological bodies such as karst,goaf and fault fracture zone in railway engineering,OCTEM is used to carry out the survey work.Firstly,the rules and attentions of parameter selection in the survey work are summarized.And then,by comparing and analyzing the obtained detection results with the existing geological data,the range of 3 karst caves and 3 mined-out areas and the location of 1 fault fracture zone are more accurately delineated.With its own advantages,OCTEM has achieved good application results in the survey of bad geological bodies in railway engineering.It is a kind of new and effective geophysical prospecting means for railway engineering investigation,and can be popularized and applied in similar railway investigation work.