Synthetic advanced geological prediction technology for tunnels based on GPR
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摘要: 以地质雷达为超前预报的主要手段,结合TGP206地震反射波法和工程地质调查法,针对某特长隧道开展综合超前地质预报。通过时域有限差分(FDTD)法,得到了掌子面前方典型不良地质体正演模拟合成图,以此作为地质雷达实际探测图像解译的基础;采用TGP206超前地质预报系统对掌子面前方100 m范围内进行长距离预报,在接近不良地质体时,用地质雷达对掌子面前方20~30 m范围进行更精确的短距离预报;将该法应用于实际工程断层破碎带和富水带的预报中,预报结果较为准确,有效指导了隧道的安全施工,该综合超前地质预报方法可为同类工程提供借鉴。Abstract: Combined with the TGP206 seismic reflection method and engineering geological survey, the synthetic geological prediction based on GPR is carried out for a super long tunnel. Using the finite-difference time-domain (FDTD) method, the forward simulation synthesized maps of typical defective geologies in front of the tunnel face are obtained, which are the basis for the interpretation of actual detection images of GPR. Long-distance prediction 100 m ahead of the tunnel face is carried out by means of the TGP206 geological prediction system, when approaching the defective geologies, more accurate short-range prediction 20~30 m ahead of the tunnel face is carried out through the geological radar. The proposed method is applied in the prediction of fault fracture zone and water-rich zone in practical engineering. The predicted results are accurate and can effectively guide the tunnel construction. The synthetic advanced geological prediction method can provide a reference for similar projects.
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