深埋高地应力TBM隧道挤压大变形及其控制技术研究

深部岩体构造复杂、地应力高,对于挤压性地层开挖后容易产生挤压大变形,大量实践经验表明,若不及时合理处置应对将造成巨大的经济损失。关注TBM隧道,介绍围岩挤压大变形的机制、关于挤压性地层的提前预报方法和监测辨识指标,讨论预测围岩收敛变形的方法并详细介绍人工智能和非确定性分析方法,最后总结归纳常用的应对挤压性地层的处置手段。各种关于TBM隧道挤压大变形的辨识公式、预测方法以及处置手段都是依托相应的工程案例而建立,盲目的套用并不一定能起到预期的效果,建议具体工程问题应具体分析,综合比选,各取所长。

RESEARCH ON SQUEEZING LARGE DISPLACEMENT AND ITS DISPOSING METHOD OF WEAK ROCK TUNNEL UNDER HIGH IN-SITU STRESS

Without timely and reasonable treatments，the large convergence displacement due to high geostress and complex tectonic stress of ground squeezing will result in economic losses. TBM tunnels were the focus of the study. The mechanism of large displacement due to ground squeezing was described. The prediction and recognition methods were presented. The prediction methods of convergence displacement of tunnel including AI method and uncertainty analysis method were discussed in detail. Finally the common disposal methods for grounds under different squeezing levels were summarized. The formulas for recognition，the prediction methods and the disposal technologies of large squeezing displacement of TBM tunnels were developed for corresponding projects，so blindly using these methods yielded no effect. We suggested the choosing of these methods with caution.