“全-半断面”工况下TBM贯入度影响因素分析

Analysis of influencing factors of TBM penetration under″full and half sections″

为探究不同工况下硬岩隧道掘进机(TBM)贯入度的变化特征,以缙云抽水蓄能电站TBM法开挖排水廊道工程为例,分析隧道线路相交处施工工艺;分析TBM滚刀受力,建立单滚刀破岩模型,采用有限元分析软件探究滚刀破岩流程;根据现场实际掘进数据,对半断面-全断面工况下TBM掘进参数与岩石参数间关系进行了分析。研究结果表明:半断面掘进工况下,TBM贯入度随刀盘推力增加呈对数函数增长,随刀盘扭矩增加也呈对数函数增长;而全断面工况下,TBM贯入度随刀盘推力与刀盘扭矩增加分别呈现指数函数与线性函数增长趋势,且增长率均与岩石参数相关。

In order to explore the variation characteristics of hard rock tunnel boring machine(TBM)penetration under different working conditions,taking the TBM excavation drainage corridor project of Jinyun Pumped Storage Power Station as an example,the construction technology of tunnel line intersection is analyzed.The force of TBM cutter is analyzed,the rock breaking model of single cutter is established,and the rock breaking process of cutter is explored by finite element analysis software.According to the actual excavation data,this paper analyzes the relationship between TBM excavation parameters and rock parameters under half-section-full-section conditions.The results show that under the condition of half-section tunneling,the penetration of TBM increases logarithmically with the increase of cutterhead thrust,and also increases logarithmically with the increase of cutterhead torque.Under the full section condition,the penetration of TBM shows an exponential function and a linear function growth trend with the increase of cutterhead thrust and cutterhead torque,respectively,and the growth rate is related to rock parameters.