Three-dimensional Advanced Geological Forecasting Technique for Tunnels Based on HSP-GPR Method and Its Application
In tunnel construction,karst disaster susceptible geological structures may trigger geological hazards such as karst water inrush,collapses,and surface subsidence,seriously jeopardizing tunnel construction safety.Consequently,proactive geological forecasting is of paramount importance to ensure the safety of tunnel construction in karst regions.Commencing with a focus on karst tunnel construction geological hazards,disaster causing structures,and disaster trigge-ring models,this study conducted research on proactive geological forecasting for karst tunnels based on the seismic-elec-tric joint detection technology,subsequently applying it to the newly constructed the tunnel of a new railway line.The re-search findings reveal that the horizontal sonic profile(HSP)method and the ground penetrating radar(GPR)method can effectively complement and mutually validate one another.The seismic joint inversion,with the assistance of resistiv-ity inversion,adeptly reconstructs the approximate shape and position of karst cavities while rendering a more uniform wave velocity profile within low-speed interfaces.In cases where the HSP survey results exhibit anomalous mileages,the GPR method can be employed to further determine the scale and characteristics of these anomalies.Through comparative validation and comprehensive analysis of the differences in various geophysical parameters(velocity,dielectric/resistiv-ity)within the underground medium,detailed dimensions and reliable properties of adverse geological bodies preceding the tunnel are ascertained.This,in turn,facilitates the identification and prediction of karst disaster suscep-tible geological structures and disaster triggering models.The research on proactive karst tunnel forecasting,employing HSP-GPR joint detection technology,provides crucial support and guidance for the formulation of preventive measures and the establishment of monitoring systems.Importantly,it serves as a valuable reference for similar karst tunnel pro-jects.
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