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Highway construction and operation of domestic and international practice has shown that the attenuation and loss of road functional performance greatly relates to the existence of groundwater and surface water.With the development of road construction, especially highway construction,the impact of water on the highway has becoming prominent.Road drainage facilities are an important component of highway engineering. So subgrade drainage project,especially concealed drainage works,need to be detected to guarantee the quality,give full play to its project results,and timely find problems at running highway.Subgrade drainage project has long been arisen problems in the operating period and then reworks,and concealed engineering quality detction and evaluation methods also use traditional excavation inspection and drilling technology.Whereas the GPR detection technologycan be used to detect underground structures,underground cavity, underground buried objects,underground soft-storey and underground water-rich conditions,and GPR has many advantages with high precision,high differentiated capabilities,visual detectional results and quick and easy on-site detection,etc.;HDEM can be used to detect underground structures,underground water-rich conditions, underground cavity,the thickness and extent of glide lamella and so on,and has many advantages with low cost,high efficiency,great data density,rich information,and more intuitive,efficient and accurate reflecting geoelectric section,so GPR and HDEM can used to detect the drainage effect of subgrade drainage project with non-destructive testing.This article focuses on subgrade drainage project and GPR and HDEM theory,data processing and interpretation,and studies the applied research of drainage effect of subgrade drainage project,and through detecting application example,it verifies the applicability of the detection methods.
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