综合物探技术在空铁岩溶探测中的应用

Application of,Comprehensive Geophysical Technology in Air-rail Karst Detection

本文介绍了采用高精度瞬变电磁法、跨孔电磁波CT法、孔内三维激光扫描等综合物探手段在湖北省恩施市青云崖空铁地质灾害评价工程中探测隐伏岩溶的应用效果。由于空铁线路设计在悬崖附近,工区地质条件复杂,岩溶较发育,悬崖附近的不良地质体可能对空铁建设有一定影响。查明工区的不良地质(岩溶)空间分布情况是本次工作的目的。针对此项目特点,首先采用了地面高精度瞬变电磁法进行地面普查寻找异常靶区,然后针对验证钻孔揭露的溶洞,通过跨孔电磁波CT法进行精细探查,最后采用孔内三维激光扫描直接测量溶洞大小及规模。事实证明,在地质灾害勘查中,综合物探技术是有效的、必要的探查手段。

This paper introduces the application effect of high precision transient electromagnetic method,cross-hole electromagnetic wave CT method,and in-hole three-dimensional laser scanning in detecting hidden karst in the Qingyunya cliff air-rail geological hazard assessment project in Enshi city,Hubei province.As the air-rail line is designed near the cliff,the geological conditions of the work area are complicated and the karst is well developed,the unfavorable geological bodies near the cliff may have some influence on the construction of the air-rail.The purpose of this work is to find out the spatial distribution of unfavorable geology(karst)in the work area.In view of the characteristics of this project,first the ground high-precision transient electromagnetic method is used to find abnormal target areas,then the caves exposed by the verification boreholes are carefully explored by the cross-hole electromagnetic wave CT method,and finally the cave size and size are directly measured by in-hole three-dimensional laser scanning.Facts have proved that comprehensive geophysical exploration technology is an effective and necessary means in the exploration of geohazards.