双护盾TBM施工综合超前地质预报技术探讨

为了提高双护盾TBM隧道施工中超前地质预报的准确性,本文以西藏某公路隧道为例介绍了以“前期地质工作是基础,物探工作是手段,地质分析是主线”为思路的地质预报综合技术。该综合预报技术首先分析前期地质资料进行整体预测并提出预报工作的重点和关键,其次利用沿线EH4等地表物探成果对全线的地质条件和不良地质问题提出分段整体预测成果,然后结合双护盾TBM施工工艺和可能遭遇的关键工程地质问题选择适应性良好的物探手段进行施工期中长距离测试,最后进行综合地质分析做出预报结论。该综合预报技术的应用成功对某处不良地质洞段进行了超前预报,该技术可供同类工程借鉴与参考。

Discussion on Comprehensive Advanced Geological Prediction Technology in Double-shield TBM Construction

In order to improve the accuracy of the advance geological prediction in the tunnel cut by double-shield TBM, taking a road tunnel in Qinghai-Tibet Plateau as an example, this paper introduces the comprehensive technique of geological prediction based on “pre-geological work is the basis, geophysical exploration work is means, geological analysis is the main line”. The comprehensive prediction technique firstly analyzes the preliminary geological data and puts forward the key points of the forecast work. Secondly, give the overall prediction results of geological conditions and problems of each part along the tunnel based on the results of surface geophysical test such as EH4. Then select the adaptive geophysical methods to carry out the long distance test according to the construction technology and the geological problems that may be encountered. Finally, a comprehensive geological analysis is carried out to make the prediction. Successful prediction of a tunnel section with unfavorable geological condition using this comprehensive technique. This technique is available for reference to similar projects.