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Research on Detection Standard of Karst Roadbed Grouting Effect Based on the Geophysical Methods

To study the grouting detection standard of Karst roadbed based on resistivity method, transient Surface wave method and electromagnetic wave CT, the typical test areas in the Karst roadbed of NANNING-GUANGZHOU railway are selected, and the field test research of grouting detection standard of Karst roadbed was studied by the above three geophysical methods. The grouting qualified Karst roadbed was determined by multiple methods of borehole coring and field water pressure after grouting, and the test results of Karst roadbed grouting qualified was confirmed effective sample. The difference value of resistivity, surface wave velocity and electromagnetic wave absorption coefficient of limestone layer, clay, pebble soil and Karst cave was statistical analyzed based on the effective test data, and preliminarily obtained the detection standard of Karst roadbed grouting effect based on the above three geophysical methods.