不同间距和倾角的岩石节理对TBM滚刀破岩的影响

在隧道掘进机(tunnel boring machine, TBM)开挖过程中会遇到表面节理条件不同的围岩,影响TBM操作参数的选取和施工效率。为研究节理条件对滚刀力的影响,本研究设置了三种岩面切缝方案模拟不同间距和角度的节理岩石进行线性切割试验,观察岩面破坏情况,收集岩渣并记录滚刀破岩的三向力和振动信号,从岩体破坏、刀具振动情况分析贯入度、切缝的间距和角度对滚刀破岩效果的影响。结果表明：滚刀法向力和滚动力均随着贯入度的增大而增大；切缝间距400 mm比间距200 mm的岩样所需的破岩力更大,但是破岩效果较差；斜切缝岩样相比平行切缝岩样所需破岩力更低而破岩效果较好。在此基础上本研究利用多元线性回归方法建立了滚刀力预测模型,具有较高的预测精度。

Influence of rock joint with different spacing and dip angle on rock breaking by TBM cutter

During the excavation of tunnel boring machine (TBM), surrounding rock with different surface joint conditions will be encountered, which will affect the selection of operation parameters and construction efficiency of TBM. To study the influence of joint conditions on the cutter force, three kinds of scheme of rock linear cutting were set up in this research. During the experiment, the rock face failure was observed, the rock slag was collected and the cutter force and vibration signals of rock breaking process were recorded. The influences of penetration, joint spacing and joint angle on rock breaking were analyzed from rock mass failure and cutter vibration. The results show that the cutter force increases with the deeper penetration. And the rock sample with 400 mm joint spacing requires larger force than that with 200 mm joint spacing, but the rock breaking effect is poor. Compared with parallel jointed rock samples, inclined jointed rock samples require lower force and have better rock breaking effect. On this basis, a prediction model of cutter force is established through multiple linear regression method, which takes penetration, joint spacing and joint angle as independent variables. It shows that the prediction model has high accuracy.