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Application Analysis of Ultrasonic Wave and Surface Wave for Water-filled Crack Depth Detection

ZHANG Xiaolong;ZHAO Peng;XU Haoming;XU Gang;College of Civil Engineering & Architecture,China Three Gorges University;Collaborative Innovation Center for Geo-hazards and Eco-Environment in Three Gorges Area,Hubei Province;  
The measuring principle of concrete crack depth based on single plane detecting,double oblique method,drilling method and surface wave method are introduced,and combined with the engineering example,the depth results of water-filled crack and dry crack detected by single plane detecting method are compared with those by surface wave method.When the crack dry and the surface and internal of crack is filled with little or no dust and other impurities,the results of single plane detecting and surface wave method are closed to each other,and both of the results are similar to the direct measured depth of drilling; When the crack is filled with lots of mud water and impurities,only the result of surface wave method is similar to the true depth. The analysis shows that single plane method is greatly affected by water and infills,while there is little influence on surface wave method. Therefore it is suggested that surface wave method is the first choice for dam concrete and other similar semi infinite plane crack,and it depends on the specific circumstances for dry crack.
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