It is essential to predict geological risks ahead of a tunnel face during tunnel boring machines (TBMs) excavation to ensure efficient and stable tunnel construction. In this study, a series of lab-scale chamber experiments were conducted to simulate the electrical resistivity and induced polarization (IP) surveys during TBM advancement toward hazardous ground conditions. Various hazardous ground conditions (i.e., fault zones, water intrusion, geological transition, embedded core-stone, and cavities) possibly encountered during tunnel excavation were modeled in the soil chamber. The electrical resistivity and chargeability were simultaneously measured at the tunnel face modeled in the laboratory chamber during tunnel excavation. Guidelines for accurately predicting the hazardous conditions were proposed by analyzing the patterns and variations in resistivity and chargeability measurements corresponding to the TBM advancement. Note that the combined approach simultaneously implementing the electrical resistivity and IP surveys can predict hazardous ground conditions ahead of a tunnel face, which allows safe tunnel excavation by minimizing the potential risks in advance.

在隧道掘进机 (TBM) 开挖过程中，必须预测掌子面前方的地质风险，以确保高效稳定的隧道施工。在这项研究中，进行了一系列实验室规模的腔室实验，以模拟 TBM 向危险地面条件推进期间的电阻率和感应极化 (IP) 测量。在土室中模拟了隧道开挖过程中可能遇到的各种危险地层条件（即断层带、水侵入、地质过渡、嵌入芯石和空洞）。在隧道开挖过程中，在实验室模拟的隧道掌子面上同时测量了电阻率和充电能力。通过分析与 TBM 推进相对应的电阻率和充电率测量的模式和变化，提出了准确预测危险条件的指南。请注意，同时实施电阻率和 IP 测量的组合方法可以预测隧道掌子面前方的危险地面状况，从而通过提前将潜在风险降至最低来实现安全的隧道开挖。