综合超前地质预报在大罗山引水隧道的应用

Application of Comprehensive Advanced Geological Forecast in Daluoshan Water Diversion Tunnel

引水隧道具有地质复杂、线路长及埋藏深度大等特点,在引水隧道开挖过程中会遇到断层、破碎带、涌水、突泥等危险,采用综合超前地质预报可起到很好的预防作用。以大罗山引水隧道为例,采用隧道地震散射成像技术TST和地质雷达向掌子面探测区段发射地震波、电磁波信号,对接收的反射信号进行处理和解译,对不良地质及岩体构造情况进行准确预报,并采用超前炮孔和超前钻探进行验证。结果表明,超前地质预报结果与实际开挖情况较吻合,通过超前地质预报能发挥各种技术的优势并相互印证,大幅提高超前地质预报在引水隧道应用中的精度,为后期施工提供参考和依据,并提供安全保障。

The water diversion tunnel has the characteristics of complex geology,long line and large buried depth.In the process of waterdiversion tunnel excavation,faults,fracture zone,water gushing,mud and other hazards may be encountered.The comprehensive advanced geological forecast can play a good role in prevention. Taking the Daluoshan water-diversion tunnel as an example,the tunnel seismic scattering imaging technology TST and geological penetrating radar are used to transmit seismic wave and electromagnetic wave signals to the detection section of tunnel face,the received the reflected signals are processed and interpreted,the adverse geological condition and rock mass structure are accurately forecast,and the advanced blasthole and advanced drilling are used for verification. The results show that the results of advanced geological forecast are in good agreement with the actual excavation,the advanced geological forecast can give play to the advantages of various technologies and verify them with each other,which greatly improves accuracy of advanced geological forecast in application of water diversion tunnel and provides reference and basis for later construction and security guarantee.