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<p>Double-shield Tunnel Boring Machines (TBMs) have been extensively used in urban tunneling. Advanced prospecting of unfavorable geological conditions ahead of the tunnel face is crucial for ensuring construction safety. To address the challenges of limited observation aperture and low signal-to-noise ratio (SNR) in data acquisition during double-shield TBM tunneling, this study develops a seismic ahead-prospecting system and equipment. The proposed method enables the data acquisition of high SNR reflected seismic data within the small space of the tunnel. Numerical simulations demonstrate that acquiring seismic data from the exposed rock effectively minimizes waveform distortion and noise interference, thereby enhancing data quality. Laboratory experiments confirm the instrument’s stability and its capability for long-term, continuous data acquisition in double-shield TBM tunnel. Field tests further verify that this method effectively can eliminate the influence of segmental linings, obtain high SNR seismic data, and identify geological anomalies (fault, fractured zone, etc.). These results provide a reliable technical approach for detecting and locating adverse geologies ahead of the tunnel face.</p>

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Double-Shield TBM Mounted Seismic Ahead-Prospecting System and its Application

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Zhongzhi Li,
  • Lei Chen,
  • Kai Li,
  • Xinji Xu,
  • Hongyi Cao

摘要

Double-shield Tunnel Boring Machines (TBMs) have been extensively used in urban tunneling. Advanced prospecting of unfavorable geological conditions ahead of the tunnel face is crucial for ensuring construction safety. To address the challenges of limited observation aperture and low signal-to-noise ratio (SNR) in data acquisition during double-shield TBM tunneling, this study develops a seismic ahead-prospecting system and equipment. The proposed method enables the data acquisition of high SNR reflected seismic data within the small space of the tunnel. Numerical simulations demonstrate that acquiring seismic data from the exposed rock effectively minimizes waveform distortion and noise interference, thereby enhancing data quality. Laboratory experiments confirm the instrument’s stability and its capability for long-term, continuous data acquisition in double-shield TBM tunnel. Field tests further verify that this method effectively can eliminate the influence of segmental linings, obtain high SNR seismic data, and identify geological anomalies (fault, fractured zone, etc.). These results provide a reliable technical approach for detecting and locating adverse geologies ahead of the tunnel face.