滚刀作为复合式TBM的关键部件,其破岩效果直接影响施工效率和成本。针对重庆地区砂泥岩地层条件下TBM滚刀破岩效果问题,结合数值模拟进行TBM滚刀破岩机理研究,并结合实际应用验证。首先,通过ABAQUS软件进行数值模拟,确定了滚刀和岩石的材料模型参数,构建了滚刀与岩石的模型,设置了分析步、接触及相互作用。其次,系统分析了滚刀的破岩机理。最后,依托重庆地铁27号线项目,开展基于滚刀破岩机理所研制的新型滚刀的应用研究。结果表明:数值模拟结果与基于CSM模型预测结果一致,验证了数值模拟结果的准确性;揭示了重庆砂泥岩地层滚刀破岩机理为挤压﹣剪切破坏;探明了基于滚刀破岩机理所研制的新型滚刀的破岩效果。研究成果可为重庆砂泥岩地层盾构施工中滚刀的选型和应用提供理论依据和技术支持。
As a key component of compound TBM, the rock-breaking effect of hob directly affects the construction efficiency and cost. Aiming at the problem of rock-breaking effect of TBM hob under sand and mudstone formation in Chongqing area, the mechanism of rock breaking by TBM hob is studied by numerical simulation and verified by practical application. Firstly, the material model parameters of hob and rock were determined by numerical simulation using ABAQUS software, and the model of hob and rock was constructed, and the analysis steps, contact and interaction were set. Secondly, the rock-breaking mechanism of hob was analyzed systematically. Finally, based on the Chongqing Metro Line 27 project, the application research of a new type of hob based on the mechanism of hob rock breaking was carried out. The results show that: The numerical simulation results are consistent with the prediction results based on CSM model, which verifies the accuracy of the numerical simulation results. It is revealed that the mechanism of hob rock breaking in Chongqing sand and mudstone formation is compression-shear failure. The rock-breaking effect of a new type of hob based on the mechanism of hob breaking is proved. The research results provide important theoretical basis and technical support for the selection and application of hob in shield construction in Chongqing sand and mudstone stratum, and have important significance for promoting the development of shield construction technology.
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