Abstract：The lining defects of highway tunnels affect directly the life span of the lining. A geometric model of the defects of lining structures in highway tunnels was established. The detection performance and the resolution in different wavelet frequency were studied. A geoelectric model of lining on the basis of common defects was presented considering the shape and the thickness of voids，the circular and rectangular defects and the different fillings such as sand，water and air. The imaging characteristics and differences were simulated using finite difference-time domain(FDTD) method. It is found that the increase of the thickness of voids leads the imaging position of deep target to get closer to the scanning surface. The effect of the geometry of defects on the imaging features is smaller than that of fillings. The characteristics of electromagnetic wave imaging of water contained fillings are found to be more noticeable than those of air fillings and sand fillings. Water fillings absorbs the electromagnetic waves and bring about interference factors such as multiple waves from deeper targets.
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2014, Vol. 33 
