Abstract
Abstract In southern cities of China shield machines often encounter obstacles such as large boulders in complex strata which may cause more abrasion to the shield machine’s cutterhead and even make the shield machine stuck. Therefore, it is important to know distribution of obstacles in front of excavation face in advance. Ground penetrating radar (GPR) is an efficient and accurate detection method to ahead detect large boulders when GPR antennas are put in the cutter head. Synthetic simulations of GPR look-ahead detection are carried out based on finite difference time domain mothed. Antennas are put at two different radii of 4 meters and 7 meters within a 15-meter diameter cutter head. GPR response of boulders in various positions can be clearly found in B-scan images and effect of survey line radius is discussed. Reflection wave in circumferential survey line has continuous sinusoidal wave feature which is different from hyperbola curve feature in conditional straight survey line. The reflection waves of boulders in GPR B-scan images show same characteristics at two different radii of the survey line. Numerical simulation results provide evidences for GPR in accurate tunnel forward-looking detection in complex strata.
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