Abstract CSAMT has become an economical and efficient exploration method for deep-buried tunnels, but the static effect, near field effect and electromagnetic interference are prominent problems in CSAMT application.Based on engineering practices, the static effect and near-field effect generation mechanism, along with their characteristics and differences before and after correction, are discussed. If the magnetic field changes slightly in the same geological unit, it is proposed that the magnetic rod is placed far away from cultural noise sources. In the case of exploration in the Longbang tunnel, CSAMT anomalies agree well with the fault fracture zone and karst development zone disclosed by drilling, which illustrates the effectiveness of this method.
Abstract：
CSAMT has become an economical and efficient exploration method for deep-buried tunnels, but the static effect, near field effect and electromagnetic interference are prominent problems in CSAMT application.Based on engineering practices, the static effect and near-field effect generation mechanism, along with their characteristics and differences before and after correction, are discussed. If the magnetic field changes slightly in the same geological unit, it is proposed that the magnetic rod is placed far away from cultural noise sources. In the case of exploration in the Longbang tunnel, CSAMT anomalies agree well with the fault fracture zone and karst development zone disclosed by drilling, which illustrates the effectiveness of this method.
2017, Vol. 54 