Disease Identification and Analysis of Goaf Area Under Highway by Various Geophysical Methods
The Bama-Pingxiang Expressway in Guangxi passes through numerous mining areas,and the goaf formed after coal mining cause cracks or collapses in the road.Therefore,accurate detection of the location of the goaf is a prerequisite for ensuring construction safety and driving safety.A comprehensive detection of a suspected goaf was carried out by geological radar method,high-density electrical method and seismic wave scattering method,and geophysical anomaly points were verified by drilling method.The comprehensiveness and reliability of the three geo-physical methods were compared.The research results found that 4 geophysical anomalies were discovered in the survey area,but only 3 defects after verification by drilling method.Among them,no defects were found in 1 bore-hole,which may be caused by errors in geophysical results or inaccuracies caused by"one hole observation";A single geophysical method can cause detection defects.Therefore,detection and analysis should be comprehensively made by geological radar method,high-density electrical method,and seismic wave scattering method.The accuracy of the detection results should be verified by drilling method;According to the drilling results,under the specific in-strument parameters selected in this study,the detection accuracy of high-density electrical method and seismic wave scattering method is higher than that of geological radar method,which can provide guidance for subsequent geophysical research of similar projects.
goafhigh density electrical methodgeological radar methodseismic wave scattering method
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