EH-4高频大地电磁测深勘查采空区的效果分析

Analysis of the EH-4 High-Frequency MT Sounding Method in Gob Exploration

在铁路、公路、管道铺设等工程项目中,采空区的存在在线路选线、施工过程中都将产生各种安全隐患。根据采空区的不同规模所需采取的设计方案、整治措施各有不同,因而采空区的有效勘探成了后续工作得以顺利施展的前提条件。基于EH-4高频大地电磁测深法,对几种不同地质条件情况下的采空区进行勘探,判别了测区采空区异常。依据物探资料布设了验证钻孔,经钻孔验证,见到了采空区,物探成果与实际地质情况吻合较好,证实了推断的正确性,后期施工顺利。说明该方法在采空区的识别中能取得较好的工程效果,为工程项目采空区的进一步勘探提供了一定的理论指导意义。

In the construction of railways,highways and pipelines,the existence of gob areas may pose a variety of security risks in the route selection and construction process.As different sizes of gob areas need to be taken in different design,different remediation measures,the effective gob exploration has become a prerequisite for casting the follow-up work smoothly.In this paper,it explores the gob areas under different geological conditions,and determines the anomalies of gob areas based on the principle of the EH-4 high-frequency MT sounding method.According to geophysical interpretation,validation drill-hole is set in the surveyed areas,and the gob area is seen after verifying by drilling.It is proved that the geophysical results are in good agreement with the actual geological conditions,and thus the correctness of the inference is confirmed.The investigations of this paper prove that the method is efficient to identify the gob areas,and also provide certain theoretical guidance for the further exploration in gob areas.