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Abstract As an instrument of advanced geological forecast method in road tunnel, GPR（Ground Penetrating Radar）plays an
important role to predict remote structure in the front of facing frontage and can be the further realization and supplement of
tunnel prospect at the same time.On the basis of simply introducing the principle of electromagnetic wave of GPR in paper, it is
successful to forecast the the faulted zone and ground water which exist in Xinzhagou tunnel using SIR20 GPR and engineering
geology technique. The paper simply make a research on the characteristics of frequency spectra of GPR' reflective wave to these
harmful geological bodies and it will contribute to interpret the future detecting data.
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