JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2017, Vol. 34 ›› Issue (8): 36-40.DOI: 10.11988/ckyyb.20170022

• ENGINEERING SAFETY AND DISASTER PREVENTION • Previous Articles     Next Articles

Common Interferences of Ground Penetrating Radar and Advanced Prediction of Bad Geological Bodies in Tunnel Engineering

YUE Quan-gui1, ZHANG Yang2, XIAO Guo-qiang2, ZHOU Li-ming2   

  1. 1. Wuhan China Communications Geotechnical Engineering Co.,Ltd., CCCC Second Highway Consultant Co., Ltd.,Wuhan 430056,China;
    2.Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute,Wuhan 430010,China
  • Received:2017-01-04 Revised:2017-03-14 Online:2017-08-01 Published:2017-08-18
  • Contact: 张 杨(1991-),男,湖北荆州人,助理工程师,硕士,主要从事工程物探和岩石力学理论与应用研究,(电话)18271397203(电子信箱)297380421@qq.com。

Abstract: In order to apply ground penetrating radar(GPR) to accurate advanced geological prediction in tunnel engineering, we discussed the causes of common interferences and their influences on data interpretation, and determined the reflected interference information in profile of GPR image. Then, we gave examples of the antenna coupling and metal interferences and put forward precautions to avoid interference in the process of collecting GPR data. On the basis of three examples, we introduced the prediction of bad geological bodies such as karst cave, fault fissure water, and weak interlayer. Through analyzing typical characteristics of waveform, frequency and amplitude of the profile, we predicted the type of bad geological body as well as the spatial distribution characteristics like location and structure strike ahead of the working face of the tunnel. The prediction results are basically consistent with the distribution of bad geological bodies revealed by excavation, which proves that GPR is feasible and effective in the prediction of common bad geological bodies. By summarizing and analyzing the common radar interference images and the profiles of GPR images of typical geological bodies, we can provide references of interpreting complex geological bodies more precisely for geophysical workers and ensure the safety of tunnel construction.

Key words: advanced tunnel geological prediction, ground penetrating radar (GPR), interference factor, typical bad geological body, interfered radar image features

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