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Subgrade as a major component of the road, its quality and the severity of disease related to traffic safety. Influenced by the traffic load and natural factors,subgrade will appear various of disease seriously or lightly.This disease will gave great security risk to highway operations.With the rapid development of highways, diseases of subgrade in use become prominent day by day. Therefore,how to exactly detect subgrade disease and apply effective treatment is particularly important for operation of the highway. How to comprehensive and objective, real and effective, low-cost, low power consumption and low interference detect and evaluate subgrade disease become a urgent problems.For a long time,the subgrade project quality testing and evaluation method follows the traditional excavation inspection and drilling and sampling test techniques.With the increasing development and maturity of non-destructive testing technology,as a reference to subgrade quality inspection laid the technical foundation.Geological radar detection technology can be used to detect underground structures, underground hole, underground buried objects, underground soft layer and the density of underground and so on, due to its advantages of high-precision, high-resolution capabilities, visual detection results and on-site inspection quickly and easily,etc.High-density electrical method can be used to detect underground geological structure,underground water conditions,underground hole,slip-layer thickness and the geometric characteristics,due to its advantages of low cost,high efficiency,high density data,rich information,geoelectric section case can be reflect more intuitive,efficient and accurately,etc.So in this paper,ground penetrating radar, high-density electrical method used to study non-destructive testing of subgrade.Through the analysis of disease causes and character, the study of Geological radar detection technology and High-density electrical method theory,data processing, interpretation, combined with actual project,carried out basic and applied research of geological radar and high-density electrical engineering technology for subgrade monitor,verify the feasibility and applicability of this non-destructive testing methods.
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