Application of Comprehensive Geophysical Prospecting Method in Basement Hidden Karst Detection of Guinan's High-speed Railway Tunnel
When the high-speed rail tunnel passes through the karst area,due to the influence of topography and limitation of geophysical exploration methods,the karst development is not fully investigated during the investigation stage.This paper combines high-density seis-mic image,geological radar,two-dimensional transient surface wave and drilling methods to study the data acquisition,processing methods and data analysis of various methods in karst exploration during the tunnel construction stage in detail.After research,the main frequen-cy of seismic image is increased to 800 Hz,which can distinguish empty karst caves and filled karst caves with depth of 5～25 meters and width of about 10 meters;the effective energy of geo-radar is increased to 600ns,which can distinguish karst channels with depth of 30 me-ters.Combined with various typical image characteristics in karst exploration at the bottom of Guinan high-speed railway tunnel and the requirements of the geologists and constructors,the four categories of interpretation principles for the geophysical geological interpretation of karst exploration data at the tunnel bottom are discussed,which meets the requirements of geologists and design and construction for the readability of geophysical exploration data,and provides reference for the interpretation of karst exploration data.
karst detectionthe bottom of the tunnelseismic mappinggeological radartransient surface waves
NETL
NSTL
万方数据
维普
