Concealed karst poses significant safety hazards to railway construction and operation in karst regions due to its strong concealment and irregular development.Seeking efficient and precise detection methods is a crucial challenge in concealed karst exploration.Geophysical methods,leveraging the physical property differences between karst and surrounding rock masses,exhibit excellent detection capabilities for concealed karst.Among these methods,the ground penetrating radar(GPR)technique has been widely applied in recent years for detecting concealed karst beneath railways,highways,and urban areas due to its high efficiency,non-destructive nature,and low cost.This paper takes the ongoing construction of the Guiyang-Nanning High-speed Railway as a case study,utilizing two types of GPR equipment to detect concealed karst within a rocky slope.A detailed comparison of the detection results obtained from the two GPR systems is presented,and the results are further validated through excavation.The findings indicate that both GPR systems achieve satisfactory detection outcomes in the exploration of concealed karst geological bodies.This research provides valuable insights for equipment selection in similar concealed karst detection tasks.
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