TST超前地质预报在秘鲁圣加旺水电站TBM施工中的应用

地质问题导致的TBM卡机情况时有发生,一旦出现卡机,严重影响施工进度。因此,对于围岩状况的超前地质预判和提前应对处理十分必要。秘鲁圣加旺水电站项目采用TST超前地质预报技术对TBM施工段前方围岩状况进行预报,结合TST原理对预报结果进行解读,实际围岩状况与预报结果吻合度较好。

TST超前地质预报技术在N-J工程中的应用

因其在掘进速度和安全施工上的巨大优势,TBM掘进施工技术在世界范围内被广泛应用,但由于部分隧道地质情况不明、超前地质预报方法不当造成的TBM掘进卡机情况也时有发生。结合TBM现场施工的实际情况,巴基斯坦N-J水电站项目最终采用TST超前地质预报技术指导TBM掘进施工。与TBM贯入度、推力参数的对比分析表明,TST超前地质预报技术在N-J项目TBM施工中的应用是可行的,对岩性分界面和断层位置的预报结果可信度较高。

TST和电阻率法在TBM隧道超前地质预报中的应用

该文以广西桂中治旱工程TBM隧道为例,介绍了TST隧道地质超前预报技术和电阻率法的工作原理和技术特点,综合利用这两种方法,成功预报了TBM掘进前方围岩的情况以及地下水分布情况,并针对不良地质条件提出了合理处理措施,为TBM掘进参数的调整提供指导。

Tunnel seismic tomography method for geological prediction and its application

Typical existing methods of tunnel geological prediction include negative apparent velocity, horizontal seismic profile, and the Tunnel Seismic Prediction （TSP） method as this technology is under development at home and abroad. Considering simpler observational methods and data processing, it is hard to accurately determine the seismic velocity of the wall rock in the front of the tunnel face. Therefore, applying these defective methods may result in inaccurate geological inferences which will not provide sufficient evidence for classifying the wall rock characteristics. This paper proposes the Tunnel Seismic Tomography （TST） method using a spatial observation arrangement and migration and travel time inversion image processing to solve the problem of analyzing the velocity structure of wall rock in the front of the tunnel face and realize accurate imaging of the geological framework of the tunnel wall rock. This method is very appropriate for geological prediction under complex geological conditions.