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Forward Test of GPR Detection for Typical Adverse Geological Bodies
(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010)
Abstract At present, GPR has been widely used in tunnel geological forecasts as a conventional detection method. However, due to restricted spaces, the effects of construction equipment in tunnels and multiple solutions for detecting results, GPR does not easily obtain accurate predictions of adverse geologic bodies. A forward simulation of GPR profile records of adverse geological bodies was conducted by the two-dimensional time domain finite difference method, the GPR profile features of adverse geological bodies were analyzed, and a theoretical basis for the interpretation of measured GPR data was obtained. Many geological radar field tests for the three karst tunnels on the Anjiang expressway were carried out, and successful predictions of the adverse geological bodies of a karst cave containing water, a hollow karst cavity and a corrosive fracture zone were achieved based on the geological sketch documents of the work face at the construction site. The accuracy of GPR for detecting adverse geological bodies during tunneling is improved by the above mentioned method, which provides a safety guarantee for tunnel engineering.
Abstract：
At present, GPR has been widely used in tunnel geological forecasts as a conventional detection method. However, due to restricted spaces, the effects of construction equipment in tunnels and multiple solutions for detecting results, GPR does not easily obtain accurate predictions of adverse geologic bodies. A forward simulation of GPR profile records of adverse geological bodies was conducted by the two-dimensional time domain finite difference method, the GPR profile features of adverse geological bodies were analyzed, and a theoretical basis for the interpretation of measured GPR data was obtained. Many geological radar field tests for the three karst tunnels on the Anjiang expressway were carried out, and successful predictions of the adverse geological bodies of a karst cave containing water, a hollow karst cavity and a corrosive fracture zone were achieved based on the geological sketch documents of the work face at the construction site. The accuracy of GPR for detecting adverse geological bodies during tunneling is improved by the above mentioned method, which provides a safety guarantee for tunnel engineering.
2018, Vol. 55 