Investigation of Geoelectric-While-Tunneling Methods through Numerical Modeling
نویسندگان
چکیده
In this paper, we explore the fundamental physics behind the application of electrical resistivity and induced polarization during tunnel boring machine (TBM) mining. Using finite element (FE) analysis, we model the electric field created when current is injected into the surrounding ground via electrodes in the TBM cutterhead. The FE analysis simulates a variety of materials and conditions including soil, rock, air-filled voids, water-filled voids and clay seams within rock. The simulations illustrate the ability of electrical techniques to detect a change in lithology ahead of the TBM and to detect an anomaly of finite dimension. The sensitivity to such changes depends on the conductivities of the material and anomaly, and the distance ahead of the TBM. Simulations illustrate that cavities as small as 0.1 m can be detected.
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