| In Chinese transportation high-speed development period, the tunnel as a main structure of cross mountain plays a major role in the transportation system. But in these have been built in the tunnel, the tunnel engineering design and construction of the improper will appear a variety of problems, there are serious flaws in many tunnel has various. In recent years, the media also reported that some, such as the Shanghai metro line four, tunnel across the river tunnel leakage accident occurred, the reason is waterproof system of tunnel edge existence of concealed faults and karst cave destroyed tunnel. Therefore, the detection of quality engineering has been the social attention.The rapid development of science and technology has led the detection equipment and detection means not only update. Geological radar method is nondestructive, high efficiency, high resolution and portability, and is capable of detecting tunnel lining continuous, fast acquisition of radar image and other advantages, can accurately locate the position of the hidden danger of tunnel lining, and treatment of timely to hidden trouble, brings a strong technical support for China’s transportation construction. This paper firstly introduces the working principle of geological radar and its setting in tunnel detection process related parameters. Then described the scene detection before starting work need to do to prepare, including: the scene detection conditions, trolley structures, radar antenna selection and parameter selection and calibration, and some related key points of operation and prevention measures. The main part is through geological radar in the field test items in the collection back to the some examples about image, common in tunnel construction process, less dense, less thick slab and reinforced missing some defects and diseases. At the same time in the process of collecting a lot of data, through summarizing the interference image source causing interference in some of the radar data and produces the was found, also has the very big help to the future work, so that we are more accurate for identification. Finally a brief introduction of detecting hidden karst tunnel bottom work development situation.In the high-speed railway development today, especially our railway southwest plateau area increasing, and its geological condition is complex, and is a railway line through the mountains, the line in the tunnel are. Geological radar method as on-site monitoring of tunnel quality is the most common method, we also through measurement and data analysis of a large number of field found many ways to distinguish the pseudo defects and defect really, we can quickly and accurately identify the defect types and areas, contribute to the construction unit of the next step annealing on defects, improve the quality of construction engineering to ensure entity, and finally the operation of the railroad traffic safety is of great significance. |
PDF Full Text Request